186 AMERICAN JOURNAL 



Guppy considered this (Ann. and Mag., 1866) to be T. lam- 

 ellata. Pot. and Mich., considering that species to be identical 

 with L. antillarum, Shuttl. Shuttleworth (Diagn. n, Moll. No, 6) 

 referred var. /3, Graoilior^ lamella validiore of his species, with 

 doubt, to that of Pot. and Mich. T sent specimens collected by 

 Gill to PfeiiFer, who described the species under the above name. 



31. Vertigo (Pupa) Eyriesi, Drouet, Moll. Guy. Franc, p. 



71, pi. 2. f. 16-17 (1859). 



Two examples found on ferns at San Fernando. Guppy. 

 Also in French Guiana. 



A single broken specimen, apparently of this species, was col- 

 lected by Gill. 



32. Pupa uvulifera, Guppy. Ann. and Mag., June, 1868. 



33. Pupa auriformis, Guppy. Ann. and Mag., 1. c. 



31. Cylindrella Trinitaria, Pfr. Mai. Blatt. 1860, p. 213, 

 plate ii, fig. 4 — 7. 



The steep and overhanging sides of the small rocks of rugged 

 limestone in the woods on the Laventille Hills, near Port-of- 

 Spain, are frequently decorated with dozens of these little shells, 

 attached by their apertures to the rock. Gill, Guppy. 



Specimens collected by Gill, sent by me to Poey, were for- 

 warded by him to PfeifFer, who described the species. 



I lately published some notes (Annals, viii, 170, 1868) on the 

 lingual dentition of Cylindrella, and repeated the frequently 

 made statement that it has no jaw. The discovery of a jaw in 

 the large Mexican forms induced Crosse k Fischer (Jour, de 

 Conch., January, 1868) to establish the genus Eucalodium. Hav- 

 ing very recently received, from my valued correspondents Ven- 

 dryes and Gloyne, specimens of several species of Cylindrella 

 from Jamaica, with the animals preserved in glycerine, I exam- 

 ined them with great care, and to my extreme surprise found a 

 jaw, allied in structure to that of Macroceratnus (Annals, viii, 

 162, fig. 5 ; ix, 84, fig. 4), in C. rosea, sanguinea, brevis^ Maugeri, 

 gracilis, and elongata. I have detected the jaw, of similar charac- 

 ter, also in C. Bahapiensis of New Providence, C. scceva, Elliotti 

 and Brooksiana of Cuba, and in C. Trinitaria.\ 



The jaw of (7. Trinitaria \s — and the same may be said of 

 those of the other species — of a texture so extremely thin and 

 delicate that it may almost be described as membranaceous 

 rather than horny. It is transparent, pale yellow, arcuate, 

 composed of numerous plates disposed in the same manner as in 



