diff --git a/include/xo/interpreter2/DGlobalEnv.hpp b/include/xo/interpreter2/DGlobalEnv.hpp
index e2df166b..da7f8536 100644
--- a/include/xo/interpreter2/DGlobalEnv.hpp
+++ b/include/xo/interpreter2/DGlobalEnv.hpp
@@ -47,8 +47,8 @@ namespace xo {
             /** @defgroup scm-globalenv-methods methods **/
             ///@{
 
-            /** symbol-table size.  Is the number of distinct global symbols **/
-            size_type size() const noexcept { return symtab_->size(); }
+            /** symbol-table size.  Is the number of distinct global variables **/
+            size_type n_vars() const noexcept { return symtab_->n_vars(); }
 
             /** lookup current value associated with binding @p ix **/
             obj<AGCObject> lookup_value(Binding ix) const noexcept;
diff --git a/include/xo/interpreter2/DLocalEnv.hpp b/include/xo/interpreter2/DLocalEnv.hpp
index eaef71c2..ab407063 100644
--- a/include/xo/interpreter2/DLocalEnv.hpp
+++ b/include/xo/interpreter2/DLocalEnv.hpp
@@ -41,7 +41,8 @@ namespace xo {
             ///@{
 
             DLocalEnv * parent() const noexcept { return parent_; }
-            size_type size() const noexcept { return symtab_->size(); }
+            size_type n_vars() const noexcept { return symtab_->n_vars(); }
+            size_type n_types() const noexcept { return symtab_->n_types(); }
 
             /** lookup current value associated with binding @p ix **/
             obj<AGCObject> lookup_value(Binding ix) const noexcept;
diff --git a/src/interpreter2/DGlobalEnv.cpp b/src/interpreter2/DGlobalEnv.cpp
index 2ad6c1ba..fcc92efa 100644
--- a/src/interpreter2/DGlobalEnv.cpp
+++ b/src/interpreter2/DGlobalEnv.cpp
@@ -21,7 +21,7 @@ namespace xo {
         DGlobalEnv::_make(obj<AAllocator> mm,
                           DGlobalSymtab * symtab)
         {
-            DArray * values = DArray::empty(mm, symtab->capacity());
+            DArray * values = DArray::empty(mm, symtab->var_capacity());
 
             void * mem = mm.alloc_for<DGlobalSymtab>();
 
@@ -136,7 +136,7 @@ namespace xo {
             return ppii.pps()->pretty_struct
                        (ppii,
                         "DGlobalEnv",
-                        refrtag("size", symtab_->size()));
+                        refrtag("n_vars", symtab_->n_vars()));
         }
 
     } /*namespace scm*/
diff --git a/src/interpreter2/DLocalEnv.cpp b/src/interpreter2/DLocalEnv.cpp
index 8f45b38a..3831b647 100644
--- a/src/interpreter2/DLocalEnv.cpp
+++ b/src/interpreter2/DLocalEnv.cpp
@@ -49,7 +49,7 @@ namespace xo {
             if (env) {
                 auto j = ix.j_slot();
 
-                if (j < static_cast<decltype(j)>(env->size())) {
+                if (j < static_cast<decltype(j)>(env->n_vars())) {
                     return (*(env->args_))[j];
                 } else {
                     assert(false);
@@ -78,7 +78,7 @@ namespace xo {
             if (env) {
                 auto j = ix.j_slot();
 
-                if (j < static_cast<decltype(j)>(env->size())) {
+                if (j < static_cast<decltype(j)>(env->n_vars())) {
                     log && log("STUB: need write barrier for GC here");
                     (*(env->args_))[j] = x;
                 } else {