APPENDIX TO VOL, XV. 



Genus ANISOSPIRA (see p. 24). 



A single individual of A. townsendi in alcohol, sent by Pro- 

 fessor T. D. A. Cockerell, enables me to partially characterize 

 this genus anatomically. It has hitherto been known by the 

 shell only. The specimen was retracted deep in the shell, was 

 quite hard, and could be removed entire only by the use of 

 acid or by cutting the shell. As the preservation of the latter 

 was desirable, I cut the back partly off and removed the soft 

 parts as best I could, but not in condition to give any definite 

 data upon the pallial organs or retractor muscles. 



The genitalia (pi. 63, fig. 55). The penis is very short and 

 globose, its retractor and epiphallus inserted at the broad, 

 flattened apex. It contains a very short, high pilaster. The 

 retractor muscle of the penis is inserted on the floor of the 

 lung, as usual. The epiphallus is at least four times the 

 length of the penis. The vas deferens is imbedded in the wall 

 of the vagina for a short distance, but emerges and follows a 

 sinuous course on the surface of the oviduct. The vagina is 

 short and capacious, its cavity with the usual longitudinally 

 plicate walls. The duct of the spermatheca is very long, only 

 a little swollen distally. The ovotestis was not obtained. 

 There is a stout muscle intimately attached to the upper por- 

 tion of the vagina, but its other connections were not observed. 

 It may be the right ocular retractor (fig. 55, m). 



The jaw is highly arched, rather thin, though far stronger 

 than in Urocoptis, and densely, irregularly striate vertically. 

 There is very slight projection or imbrication at some of the- 

 stride (pi. 63, fig. 51, A. totvnsendi) . 



The radula is squarish as usual, its length about three 

 times the breadth. Formula of teeth 27.1.28. The rows are 



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