188 CERION, GROUP II. 



Form parvum Maynard. (PI. 27, fig. 14.) Smaller than form 

 copia, but similar in form and sculpture, the costation being strong 

 and regular, 21-23 riblets on the penult, whorl. Whorls 9|. 

 Bluish-white, sometimes mottled with flesh color above. Length 

 15-17, diam. 7.5 mill. Varying from 18 to 15 mill. long. 



" This species occurs in a very limited area, on the west end of 

 Cayman Brae. Near the northern termination of a path that crosses 

 the key near the western end, is a strip of quite high shrubbery, and 

 in this these Strophias lived. From this point, they were scattered 

 at intervals, quite into the large colony of common Strophias, in the 

 cocoa-nut grove on the south side, having evidently been inadvert- 

 ently transported by the inhabitants." (Maynard.) 



Form lineotum Maynard. (PI. 27, fig. 15.) Similar to form copia, 

 in size and shape, or a little stouter. Closely and regularly ribbed 

 throughout, the ribs white, intervals in part or wholly purple-brown. 

 There are about 25-27 ribs on the penult, whorl, about as wide as 

 the interstices. The peristome is only moderately thickened, and 

 the parietal callus is thinner than usual in this species. Teeth long. 

 Types measure 26x10 and 24.5x10.5 mill. It varies from 27.5 to 

 18.5 mill. long. 



Found by Mr. Maynard " in a small cocoanut grove on the south 

 side of Little Cayman, near the east end, and more rarely in the 

 cocoanut grove near the boat landing, on the south side of Cayman 

 Brae. This spot on Little Cayman, about a half acre, was occupied 

 by them exclusively, while on the other Key they mingled with the 

 Common Strophias. They were probably transported from one place 

 to the other by boat, the original locality, probably, being Little Cay- 

 man. The cocoanut grove where I found these Strophias was situ- 

 ated directly on the shore, some miles from any settlement, and was 

 completely isolated from all other colonies of Strophia. The width 

 of the Key intervened between this point and a colony of S. copia on 

 the north shore, two miles, at least, of nearly naked, jagged rocks, 

 as impassable to a mollusk of this species as would be the wide At- 

 lantic, and there was no vegetation in this direction, to induce them 

 to extend their colony, and between them and the several species that 

 occupied the west end of the island were miles of rocky country and 

 the mangrove swamp. I found them very abundant, clinging to the 

 fallen cocoanut leaves and other debris that lay upon the ground. 

 They were gathered in close clusters of many individuals, often on 

 top of one another." (Maynard.) 



