2S Remarks on Classifications of 



gatis, aculeiforraibns. Folliculi mucosi, bursa et sagitta amatoria 

 desunt, flagellum obsoletmn, vagina papillis mucosis orbiculatiui cir- 

 cumdata." Die Heliceen, 2 ed. p. (35. 



Albers divides the genus into two subgenera, viz. Aegopis 

 Fitz. and Moreletia Pfr., of which algirus L. and euryompha- 

 lus Pfr. are the types. He has no American species excepting 

 euryomphalus in the genus, and although extensively remark- 

 ing on Dr. Binney's writings places fuliginosa and its allies 

 in Mesomphix, a subgenus of Hyalina, in the description 

 of the animal of which no reference is made to the mucous 

 pore. 



I should mention that Dr. Binney (Terr. Moll. II. 253), in his 

 description of the animal of H. suppressa /Say, adds : " On the 

 upper surface of the extremity of the foot is a longitudinal 

 fissure or furrow, from which mucus exudes in great quantities, 

 and which the animal shuts and closes at will." I have very 

 lately examined the animal referred to, and. find the above state- 

 ment correct. Dr. Binney does not allude to that character in 

 his notice on the animal of the very closely allied IT. gularis 

 Say, which I have not at present seen. Looking at the shells 

 alone of suppressa and gularis, they seem to belong to the same 

 genus, but the absence of the mucous pore in the animal of the 

 latter will widely separate these species. 



Differences appear to exist in the form and structure of the 

 mucous pore or slit (subcaudal gland), requiring careful exa- 

 mination. 



Albers, referring to the fulcrum, first mentioned by Lea, has 

 in his description of the genus Stenotrema the following : — " In 

 quarta parte circuitus anfractus ultimi ante aperturam, colu- 

 mella appendice callosa, lamelliformi, cavationem anfractus 

 coarctante, munita est." 



In my " Remarks on certain species of North American Ileli- 

 cidm" (Annals YL and YIL), and also in my " Notes on the 

 toothed Helices of North America" (Annals, YIL 442), I made 



