I 



174 Jaiv and Lingual Dentition of Pulmonata. 



Helix crispata, Fer. (Enrycratera). 

 Port au Prince. Mr. V. P. Parkhurst to Mr. T. Bland. 



Lingual membrane and jaw already described (see Proc. Acad. Nat. 

 Be, 1874, 57, pi. x, fig. 9*). 



Plate xii, fig. 8, represents the lower portions of the genital system. 

 The genital bladder (g. b.) is very small, globular, on a long duct, which 

 is very narrow in its upper half and gradually enlarges below until it be- 

 comes very stout. On the penis-sac (p. s.), above the junction of the re- 

 tractor muscle, is a small globular mass, of character unknown to me. 



Helix spinosa, Lea (Stenotrema). 

 Tennessee. Mr. A. G. Wetherby. 



Plate xii, fig. 3, represents the genital system of this species. The 

 penis-sac (p. s.) is very long, attenuated at either end, greatly swollen at 

 the median third of its length. The genital bladder is oval, on a short 

 duct. 



Helix stenotrema, Fer. (Stenotrema). 

 Tennessee. Mr. A. G. Wetherby. 



The genitalia are as figured forhirsuta by Dr. Leidy, in Terr. Moll. U. S. 

 There is, however, in this species, a much greater development of pros- 

 tate, testicle and epididymis. The last named organ is scarcely convo- 

 luted. The margins of the first named are scalloped. 



Helix barbigera, Redf. (Stenotrema). 

 Genitalia as in the last species. 



Helix tridentata, Say (Triodopsis). 



On pi. xvii, fig. 19, I have given the genitalia of this species. They 

 may be compared with those of the other species of Triodopsis given be- 

 low. The genital bladder with its duct offer slight variations in all these 

 species ; whether constant or not must be decided by future study. My 

 figures will draw attention to this point. 



Helix fallax, Say (Triodopsis). 

 Genitalia (pi. xvii, fig. 11). See last species. 



* There are decided side cutting points to centrals and laterals, though I failed to 

 eee them in the lingual figured. 



