272 J. B. GATENBY AND J. H. WOODGER 
suggested English equivalents based upon those used by 
previous English authors, wherever these do not involve any 
ambiguity. 
We object to the term ‘idiosome’ because it has already 
been used by Whitman (88) to mean ‘ an ultimate hereditary 
unit’. The term ‘ archoplasm’ has been used by Moore (22), 
and we have adhered to it. We have avoided the * archo- 
plasmie vesicle’ of Moore because it has sometimes been 
applied to the whole of the archoplasm, but we have sub- 
stituted ‘ archoplasmic vacuole’ instead. The only new term 
we have introduced is ‘ Proacrosomic granules’ for the minute 
oranules (idiogranulomes) of Papanicolaou and Stockard, which 
ultimately fuse to form one large * Proacrosome ’, from which 
the acrosome is later differentiated. No one can object to this 
word for it is self-explanatory. It will be noted that we have 
explained all the complicated processes leading to the formation 
of the acrosome, without having recourse to the invention 
or adoption of a terminology of the type introduced by Papani- 
colaou and Stockard. 
Papanicolaou Suggested English 
and Stockard. Older Authors. Equivalent. 
Idiosome. Idiozome (Meves). Sphire Archoplasm (AR). 
(Niessing and Meves). <Ac- 
cessory corpuscle (Brown). 
Nebenkern (Hermann). Archi- 
plasm (Benda). Archoplasm 
(Moore). 
Idioendosome. Markschicht der Sphiire (Nies- Inner region of archo- 
sing). plasm. 
Idioectosome. Rinderschicht (Niessing). Outer region of 
archoplasm. 
Idiogranulomes. _Archosomes (Moore). Kérn- Proacrosomic 
chen (Meves). Microsomen- granules (APG). 
strata (Niessing). 
Idiogranulothecae. Archoplasmic vesicles (Moore). Archoplasmic 
Blaschen (Meves). vacuoles (VV). 
Idiosphaerosome The archosome (Moore). Das Proacrosome (PRA), 
(becomes idio- Korn (Meves), Die stark farb- 
cryptosome). baren Koérper (Benda). Mito- 
som (Niessing). 
Idiosphaerotheca. Archoplasmic vesicle (Moore). Archoplasmic 
Bliischen (Meves). | Vacuole vacuole (v) 
(Benda). Helle Membran 
(Niessing). 
