410 



TERRESTRIAL AIR-BREATIIIiNG MOLLUSKS. 



Fig. 286. 



Fig. 287. 



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

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

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



Mr. Siy no doubt referred to 0. undxtua under the name of Achatina jixm- 

 mtr/era, 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- 

 tuSy Brug. 



Rafinesque's description of Agalina fmcata will be found on p. 50 of Vol I. 

 The locality (Louisiana) is doubtful. 



The specimen figured (Fig. 28G) was collected at Key Biscayne, Florida, 

 It is als3 found at Key West. Formerly I was in- 

 clined to refer it to O. zebra, and considered it as 

 identical with specimens 

 from the Sierra Madre, Mex- 

 ico, which ^lessrs. Fischer 

 and Crosse consider O. mela- 

 norhiluSf Val. (I figure one 

 of this species in Fig. 287), 

 but am now persuaded that 

 it is simply a variety of 0. 

 rmdatus. Its o-enitalia agrees 

 with those of 0. imdatus, as 

 well as its jaw and lingual 

 dentition (see ante, p. ). 

 For 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 Orthidicu.^ 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. Bliitt., 

 18G4, PI. I. Fig. 4. There is no multifid vesicle on the penis, as in the species 

 of OrthaUcus 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., XI. 38) that OrthaUcus (jal- 

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

 organ cannot, therefore, be considered a generic characteristic. 



O. Undatu-i, var. 



O. melano chillis. 



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. 



