Dentition of Pulmonala. 41 



allied Liguus virgineus, these authors place Liguus fasciatus 

 in Orthalicus, under the subgeneric name of Orthalicinus. 

 The same reasoning will now oblige them to place Ortha- 

 licus gallina-sultana in the genus Liguus, for its dentition 

 resembles that of L. virgineus and not that of the other 

 known species of Orthalicus. It appears to me much better 

 to wait till more is known of the dentition of Orthalicus, 

 before we consider the teeth as reliable generic characters. 



Orthalicus undatus, Brug. 



It will be interesting in connection with my comparison 

 of Orthalicus and Liguus to state that having had an oppor- 

 tunity of dissecting six specimens of this species, from 

 Jamaica, I found the genitalia constantly agreeing with 

 Lehmann's fig. in Malak. , Blatt., 1864, pi. i, fig. 4. There is 

 no multifid vesicle on the penis as in the species of Orthal- 

 icus figured by Fischer and Crosse (Moll. Mex.) . With this 

 exception, the genitalia are quite like those figured by Leidy 

 for Liguus fasciatus (Terr. Moll. U. S. I. pi. v). 



It will be seen above that Orthalicus gallina-sultana is also 

 characterized by the want of the multifid vesicle. 



Liguus virgineus, Lin. 



Aux Cayes, Haiti. Mr. Robert Swift. 



In connection with my friend, Mr. Thomas Bland, I have 

 already described the jaw (L. and F. W. Shells N. A., I, p. 

 312, fig. 364) and lingual membrane (Am. Journ. Conch.VI, 

 209, figs. 3,4) of this species. The membrane having become 

 still more interesting from its resemblance in some respects 

 to that of Orthalicus gallina-sultana, Chemn. , lately examined, 

 I have given the accompanying more detailed illustrations 

 (pi. III). 



There is, it appears, considerable variation in the development of the 

 cutting points of the central and lateral teeth, and the cusps of the first 

 marginals, on different parts of the membrane. Fig. D is taken from the 

 most perfect portion of the membrane, the most anterior portion. Fig. 



