EASTERN PROVINCE SOUTHERN REGION SPECIES. 4-:l 



Jaw: se<^Fig. 462. 



Lingual membrane with 129 rows of 24-1-24 teeth each (see p. 410). 



The complete anatomy, includiug genitalia, is figured bj- Leidy (T. 

 M. U. S., 1, Plate XV, Figs. 2-4). The penis sac is short, nairow, 

 and cylindrical . The vas deferens is of a very great length when 

 (•ouii)ared with what it is usually in the other genera. Its lower part 

 about the length of the penis, is dilated to the size of the latter organ, 

 is strongly muscular, and terminates at the base of the penis sac. The 

 letractor muscle is inserted into the summit of the latter. The lining 

 membrane of the penis sac presents a single, longitudinal fold. At 

 the base of the penis sac is a short, muscular sac or protuberance, 

 l)i()bably a dart sac, although the individual dissected possessed no 

 such instrument. The genital bladder is oval; its duct is as long as 

 the oviduct, and midway receives a long, narrow duct, derived from a 

 granular, glandular organ combined with the testicle in the i)osterior 

 lobe of the liver. 



MOLOSPIRA, Mart. & Alb. 



Animal unknown. 



Shell riuiate, turreted or fusiform, apex j,^^, ^gg 



conical, not truncated; whorls 11-14, the ^^ aix^/^ r^ 



last not at all or but slightly protracted, Q&\, {Jl ^^nK ^3 

 carinated at base ; columella plicate ; aper- ' 



, . . ,. Lingual dentition of iT. GoM/wssi. 



ture quadrangular; peristome tree, ex- 

 panded. 



A Mexican genus, extending into the Texan Subregiou. 



It was formerly considered a subgenus of Gylindrella, but now is 

 known to widely differ in jaw and dentition. 



There are two species of this genus found within our limits, H. Gold- 

 fussi and Boemcri. I have not been able to examine the lingual mem- 

 brane of H. Roemeri, but, thanks to Mr. Bland, I have examined and 

 figured (Terr. Moll., V) that of B. Qoldfimi. There are 20-1-26 

 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 Crosse for information 

 regarding the jaw and dentition (Journ.de Conch., XVIII, 13,1870, 

 Plate V, and Moll. Mex. et Guat., 320, Plate XVI). The lingual mem- 

 brane in H. Trjjoni and Pfcifferi, examined and figured by those 

 liuthors, is of the same type. The centrals and laterals have a single 

 short cusp, bearing a short, blunt cutting point, both side cusps and 



