CER1ON, GROUP II. 187 



It " is found on the coast of the south side of Little Cayman, west 

 of the large mangrove swamp that nearly divides the island into two 

 unequal portions, and along the beach on the south side of Cayman 

 Brae, as far east as the cocoanut grove extends, now about half the 

 length of the key." They mingle occasionally with colonies of C. 

 copia that border the shore, and are never found far from the beach. 



Form copia Maynard. (PI. 27, fig. 13.) A solid white form, 

 sometimes bluish or pink tinted, and rarely maculate with flesh-color, 

 having 10 whorls, and rather strong, nearly regular riblets, usually 

 22-27 on the penult, whorl, though in some specimens the number 

 falls to 17. Peristome moderately, or sometimes heavily, thickened, 

 usually fleshy or yellowish. Teeth strong and long, as in typical 01 

 pannosum. Types measure 22.5x10, and 23.7x10 mill. Varies from 

 27x11.3 to 19x8 mill. 



Maynard writes : " I do not remember ever having seen any spe- 

 cies of land shell more abundant than this species of Strophia. In 

 th'e shrubbery that bordered the paths and roads about the west end 

 of Cayman Brae, they were common, clinging to the base of the 

 bushes in masses, but their stronghold was the cocoanut grove on the 

 south shore of the key, just opposite the few houses at the west end ; 

 here they absolutely swarmed in certain spots. Not only was the 

 low herbage covered with them, but they fairly whitened the bases 

 of the stems of the cocoanut trees, and often accumulated in such num- 

 bers on the small stumps that they clung on top of one another, often 

 three or four deep, and could be gathered by the double handfuls. As 

 the weather was mostly dry, they did not move much, so I could not 

 decide upon what plant they fed, but judging from their numbers, 

 this food plant must have been abundant, and by cultivation of the 

 soil, the Strophias were placed under favorable circumstances for the 

 increase of the species. Through the agency of man, three or four 

 other species had been introduced into this large colony, which occu- 

 pied in all about a half a square mile of country." (Maynard.) 



This form is hardly distinguishable from C. pannosum form inter- 

 medium except by the more numerous riblets, a character subject to 

 some variation, one lot received from Mr. Maynard comprising speci- 

 mens with 27, 24 and 17 riblets on the penult, whorl; the smallest 

 number being due to the absence of several ribs, as well as the wider 

 spacing of the others. The larger specimens have 11 whorls. The 

 name was ill-chosen, and should have been "S. copiosa." 



