354 A MANUAL OF AMERICAN LAND SHELLS. 



Helix GundlacM, Pfeiffer, Wiegm. Arch., 1840, i, 250; Mou. IleL Viv., i, 50; in Chem- 

 nitz, ed. 2, i, 239, pi. xxx, figs. 25-2S.— W. G. Bixney, Terr. MoU., iv, 12L 

 Helix pusilla, Pfeiffer, Arch. f. Nat., 1839, i, 351, nee Lowe. 

 Helix egcna, GouLD, in Terr. Moll., ii, 245, pi. xxii, a, fig. 3, not of Say. 

 Conulus Gundlachi, TuYON, Am. Jouru. Conch., ii, 2.5G (18(56). 

 Zonitts Gundlachi, W. G. Binney, Terr. Moll., v, 129. 



A species of the Florida Subregion found on the southern extremity 

 of the peninsula and also on the west coast as far north as Cedar Keys ; 

 also in Cuba and St. Thomas, Porto Kico, Vieque, Guadeloupe. Tate 

 (Amer. Journ. Conch., V, 155) quotes it from Nicaragua. The species 

 observed by him has the caudal generic characters (not dentition) of 

 Guppya. 



The species is viviparous. 



Jaw not examined. 



Lingual membrane of a Guadeloui)e specimen (Plate II, Fig. D, of 

 Terr. Moll, V,) shows 3 marginals from 2 adjoining transverse rows), 

 23-1-23 teeth, with 4 perfect laterals. This lingual is peculiar in 

 having its marginals bluntly bifid, as in J^anina and Vitrina. Some of 

 the marginals are even trifld. In this respect it agrees with the denti- 

 tion of Vitrinoconus, as does also Z. fulvus, but from that genus it dif- 

 fers in having its lateral teeth tricuspid, like the centrals. Its denti- 

 tion is altogether peculiar. 



Genitalia not observed. 



Family HELICID^. 



Micropliysa, Albers. 

 Animal as in Patula. 



Shell umbilicated, depressed, thin, delicately striate, scarcely shin- 

 ing ; spire flattened ; suture distinct ; whorls 4-5, rather convex, grad- 

 ually increasing, the last not descending ; aperture roundly lunate ; 

 peristome thin, perfectly simple, its extremities converging. 



A West Indian genus. Two of its species have been introduced into 

 the Southern Region. One indigenous species has, however, been 

 found in the Central Province and one in th3 Pacific Province. 



The jaw was supposed to be ribless, though I have found that it has 

 numerous flat, broad, crowded ribs. In M. turhiniformis (Ann. Lye. 

 Nat. Hist, of N. Y., X, 79, Plate II, Fig. 2) the ribs seem to be of the 

 character common in BiiUmulus, Cylhidrella, &c. 



Lingual membrane of vortex, turhiniformis^ incrustata, Lansingi, and 

 IngersoUi only known. The base of attachment of the centrals and 

 laterals is peculiarh^ quadrate ; both have decided side cusps and cut- 

 ing points. The change into the marginals is made in IngersoUi and 



