160 MICROCERAMUS. 



vex, the later whorls convex, last one well rounded, with a 

 very low cord-like keel at the base. Aperture irregularly 

 rounded, the outer margin very strongly arcuate, the colu- 

 mellar margin straightened; peristome whitish, narrowly ex- 

 panded and reflexed. 



Length 11, diam. above aperture 3.5 mm. 



Length 6.7, diam. above aperture 2.6 mm. 



Jamaica : Mandeville, numerous on stone walls after 

 rains (Gloyne, in Swift coll.) ; Spurtree Hill (Henderson & 

 Simpson); Potsdam, St. Elizabeth (P. W. Jarvis). Also 

 Cuba and Haiti, see below. 



B-idinnis gossei PPR., P. Z. S., 1845, p. 137 (Feb., 1846); 

 Conchyl. Cab., p. 132, pi. 42, f . 30-32 ; Monogr., ii, p. 81 ; iii, 

 366. REEVE, Conch. Icon., v, pi. 66, f. 462. Macroceramus 

 g. PFR., iv, p. 689 ; vi, 350. GLOYNE, J. de C., xx, 1872, p. 33 

 (Mandeville). HENDERSON, Nautilus, viii, 1894, p. 20 (Spur- 

 tree Hill) . BLAND & BINNEY, Amer. Journ. of Conch., vii, 

 1872, p. 187, pi. 17, f. 9, 11, 12 (teeth). W. G. BINNEY, 

 Proc. A. N. S. Phila,, 1875, p. 223, pi. 15, f. 1 (teeth) ; Terr. 

 Moll., v, p. 386, f. 268 (Pfeiffer's descr. and fig.) ; p. 384, pi. 

 10, f. Q (teeth of same Jamaican spec.). STREBEL & PFEPFER, 

 Beitrag Fauna Mex., etc., iv, pp. 90, 107, pi. 5, f. 4a (shell), 

 pi. 13, f. 9 (teeth). Cylindrella hydeana C. B. ADAMS, Con- 

 trib. to Conch., no. 2, p. 23 (Oct., 1849), no description; based 

 upon Pfeiffer's B. gossei. 



All the above references apply exclusively to the Jamaican 

 form of the species. Binney, in his several volumes on Amer- 

 ican land shells, has repeated Pf eiff er 's description and figure 

 of the Jamaican type for the Floridiau and Texan forms. I 

 am unable to see that the Cuban and Haitian forms differ 

 from that of Jamaica. Figures 91-94 are drawn from Mande- 

 ville specimens. 



The types of this species were collected by Philip H. Gosse 

 "in the neighborhood of Highgate, on the side of a conical hill 

 covered with huge masses of limestone and small rubble, and 

 crowned with a tuft of bamboo. ' ' This place is on the western 

 edge of St. Elizabeth parish (See Gosse, A Naturalist's So- 

 journ in Jamaica, p. 126). 



