227 



THE DEXTITIOX OF THE TUPID^E. 

 By the Rev. Professor H. M. Gwatkix. 



Bead I2th March, 1897. 



I AM able to confirm Dr. Stcrki's interesting discovery (Xautilus, 

 vol. X, pp. 75-6) that Vertigo edentula, Drap., has the dentition of 

 Pimctiim. I can add that it is the same with Vertigo simplex, Gkl., 

 if it be a distinct species. Dr. Sterki revives for these the generic 

 name of Sphyradium. 



The rest, however, of my Pupida) are quite different. They are of 

 two types — 



{A) Central tooth uni- to bicuspid. Laterals bicuspid, inner cusp 

 large. Outer teeth broad, multicuspid, inner cusp largest. 



(Z?) Central tooth and laterals unicuspid, base longer than in A. 

 Outer teeth bicuspid, occasionally approximating to the 

 A type. 



n R R 



II. \i 



III. 



v-^^ 



Series of teeth in radula of : 



I. Sphyradium edentulum, Drap. 

 II. Pupa megaclieilos, Jan. 

 III. Fupa doliuin, Drap. 



The list will stand thus : — 



To A belong — Pupa affinis, Possm.; anconostoma, Lowe; armifera 

 Say ; avenacea, Brug. ; Braunii, Rossm. ; Californica, Eve. ; cinerea 

 Drap.; clausilioides, Boub. ; contracta, Say; corticaria, Say; cylindracea 

 Da C. ; dolium, Drap. ; Eyriesi, Drouet ; fallax. Say ; frumentum, Drap. 

 Uimana, Gredl. ; marginata, Drap. ; milium., Old. ; Montserratica, Fagot 

 Muhlfeldtii, Kiister ; nana, [?] ; pachygastra, Ziegl. ; Pacifica, Pfr. 

 P«r^/o^/, Moq.-Tand. ; procera, Gld. ; RJiodia, Poth ; ringens, Jeifr. 

 rugosula, Sterki ; rupicola, Say ; secalina, Marts. ; Semproni, Charp. 



