176 TERRESTRIAL AIR-BREATHING MOLLUSKS. 



Helix submeris, Mighels, Bost. Proc, I. 187 (1844). ■ — Ffeiffer, Mon. Hel. 



Viv., III. 183. 

 Helix rhodocheila, Binney (formerly), Terr. Moll., I. 

 Hemitrochus hecmastomus, Swainson, Malac. 165, Fig. 19? 

 Helix polychroa, Binney, Terr. Moll., II. 123, Pis. XLVI., XLVII. 

 Polymita varians, Tkyon, Am. Journ. Conch., II. 321 (1866). 



A species of the West-Indian fauna, common on New Providence; found also 

 in the Florida Subregion on the Keys, Key West, Key Biscay ne, Cape Florida. 



Animal (see Vol. IV. Pi. LXXV1II. Fig. 22) : body of a delicate white 

 color, very finely granulated ; eye-peduncles rather long ; a dark line arising 

 between the eye-peduncles and along the back passes under the shell ; a fainter 

 line is found along each side of the neck. 



Among the varieties the following may be enumerated : — 



a. Elevated, white with a median black band on the outer whorl, which is 

 sutural on the spire margined with pale citron. 



/3. The same, with two approximate black basal bands. 



y. Elevated, white with two narrow bands on the outer whorls, one of which 

 is median, the other sutural on the spire, the latter interrupted. 



8. The same, with a broad basal fascia. 



t. Yellowish, with numerous bands partially blended by dusky lines in the 

 direction of the increment. 



f. Fuliginous, with a single white peripheral fascia and white umbilical area. 

 (This variety was described by Dr. Mighels under the name of H. submeris.) 



t]. Depressed, ashy-olive, with a white peripheral band. 



6. Elevated, uniform yellowish green. 



i. Uniform pale reddish. 



For jaw and dentition, see above, p. 174. 



Genitalia not examined. 



HOLOSPIRA, Mart. & Alb. 



Animal unknown. 



Shell rimate, turreted or fusiform, apex conical, not truncated ; whorls 

 11 - 14, the last not at all or but slightly protracted, carinated at base; colu- 

 mella plicate; aperture quadrangular; peristome free, expanded. 



A Mexican genus, extending into the Texan Subregion. 



It was formerly considered a subgenus of Cylindrella, but now is known to 

 widely differ in jaw and dentition. 



There are two species of this genus found within our limits, H. Gohlfussi and 

 Roemcri. I have not been able to examine the lingual membrane of H. Roe- 

 me?i, but, thanks to Mr. Bland, I have examined and figured (PI. IV. Fig. N) 

 that of H. Gohlfussi. There are 26—1—26 teeth, with about 9 laterals. The 

 cusps of the marginals are quite widely separated. The general characters of 

 the teeth are as described below. I can refer also to Messrs. Fischer and 



