6 



M 



UROCOPTINAE. 105 



than the typical form, with only 12 whorls, the 7th, 8th and 

 9th swollen. Length 12, diam. 4 mm. Occurs in the State 

 of Puebla, coll. by Liebmann. It is probably only a small 

 individual, such as occur in many species. 



Var. hogeana v. Martens. PL 23, fig. 71. 



"Aperture with a distinct angle outwardly and above, as 

 in H. goniostoma; size, sculpture and color as in H. teres. 

 Whorls 15. Length 17, greatest diam. 4%, of penult, \vhor] 

 3% mm.; length of aperture 3% mm. (v. Martens.) 



Maltrate, on the railway between Vera Cruz and the city of 



exico, a little west of Orizaba, eastern slope of the plateau. 

 (Hoge). 



This variety is probably identical with the prior H. vera- 

 cruziana Dall, p. 85. 



Subfamily UROCOPTINAE Pilsbry. 



The Antillean genera of Urocoptida form a subfamily dis- 

 tinct from the mainland forms by (1) the specialization of the 

 teeth, the central row being narrow, without ectocones, the 

 side teeth having ectocones widely separated from the meso- 

 cones, and none of them developing the entocone; (2) the jaw 

 is very thin and delicate, high-arched, composed of many nar- 

 row plaits converging mesially, as in Drym&us. To what 

 extent the soft anatomy differs can only be determined by 

 further investigation; but in the single Antillean species I 

 have thoroughly examined there are several features widely 

 diverging from the Mexican genera. 



An inconsiderable number of species of this subfamily have 

 gained a foothold on the mainland. See under Cochlodinella, 

 Brachypodella and Macroceramus. 



In dealing with Jamaican forms I have been materially 

 assisted by Messrs. P. W. JARVIS and JOHN B. HENDERSON, 

 JR. Mr. Jarvis supplied a large series of specimens, many of 

 which are illustrated on the following plates, and furnished 

 data upon the distribution of the species which could have 

 been obtained from no other source, together with notes upon 

 the species, valuable on account of his large experience with 



