410 



TERRESTRIAL AIR-BREATHING MOLLUSKS. 



Fig. 286. 



Fig. 287. 



mella is considerably thickened and folded, the columellar margin is cov- 

 ered by a black callus, and the peristome is broadly margined internally with 

 black ; further in, the aperture is purely white." 



Mr. Say no doubt referred to 0. undatus under the name of Achalina fltim- 

 migera, Fer. (ed. Binney, p. 29). He mentions also the manuscript name of 

 reses, which he had intended to give to a shell found on trees at the southern 

 extremity of East Florida, but which he afterwards found to be Bulimus unda- 

 tus, Brug. 



Rafinesque's description of Agatina fuscata will be found on p. 50 of Vol I. 

 The locality (Louisiana) is doubtful. 



The specimen figured (Fig. 286) was collected at Key Biscayne, Florida. 



It is also found at Key West. Formerly I was in- 

 clined to jefer it to O, zebra, and considered it as 

 identical with specimens 

 from the Sierra Madre, Mex- 

 ico, which Messrs. Fischer 

 and Crosse consider O. mela- 

 nochilus, Val. (I figure one 

 of this species in Fig. 287), 

 but am now persuaded that 

 it is simply a variety of O. 

 undatus. Its geiiitalia agrees 

 with those of 0. undatus, as 

 well as its jaw and lingual 



dentition (see ante, p. ). 

 O. Undatus. var. _ n .. 



r or jaw and lingual denti- 

 tion see above, pp. 407, 408; Fig. 285 and PI. X.'Fig. H. 



It will be interesting, in connection with my com- 

 parison of Orthalicus and Liguus, to state that, having 

 had an opportunity of dissecting six specimens of this species from Jamaica, I 

 found the genitalia constantly agreeing with Lehmann's figure in Malak. Blatt., 

 1864, PI. I. Fig. 4. There is no multifid vesicle on the penis, as in the species 

 of Orthalicus figured by Fischer and Crosse (Moll. Mex.). With this excep- 

 tion, the genitalia are quite like those figured by Leidy for Liguus fasciatus 

 (Vol. I. PI. V.). 



It will be seen (Ann. Lye. Nat. Hist, of N. Y., XL 38) that Orthalicus gal- 

 Una-sultana is also characterized by the want of the multifid vesicle. This 

 organ cannot, therefore, be considered a generic characteristic. 



PUNCTUM, MORSE. 



Animal heliciform, as in Patula, etc. 



Shell bearing the usual characters of Zonites (see p. 98), from which it is 

 generically separated by the nature of the jaw and lingual dentition. For 

 geographical distribution see below, p. 412. 



O. melanochilus. 



