228 CEKION, GROUP VII. 



Specimens from Marianao (pi. 21, figs. 99, 1) and Carmelo (fig. 

 98) often have the peristome much more thickened than most of 

 those from Morro Castle. At Carmelo Mr. Rhoads found the thick- 

 lipped form, the form fasti gata ; and very long, slender, blue-white 

 shells (pi. 31, fig. 98) in which the cone is feebly costate. Whether 

 these three forms occurred together or were locally segregated I <lo 

 not know. The ribs are very widely and unequally spaced in some 

 examples from this place. 



Strophia scripta Maynard (pi. 31, fig. 8) from Cardenas, seems to 

 have no differential characters to separate it from Havana chrysalis. 

 The teeth are subobsolete, peristorne thin and narrow, and color 

 "bluish white, beautifully marked with rather longitudinal patches 

 of deep purplish brown, which often overlie the striations as well as 

 the interspaces. These brown marks are encroached upon on either 

 side by alternating lines of white." Slrophia scripta obliterata May- 

 nard (pi. 31, figs. 6, 7), from Matanzas on rocks close to* the sea, 

 differs from scripta u by the smaller size and the often nearly ob- 

 literated markings." It varies from pure white to a rich reddish or 

 purplish brown with delicate horizontal lines of white, and from a 

 cylindric to a tapering form. 



Form eurystoma Mayn. (pi. 31, fig. 9). A yellowish white shell 

 with the apex flesh-colored, interior pale brown, mouth large, with 

 small teeth. Ribs rather distant, 16 on the last whorl. Length 34, 

 diam. llj mill., to 80fx9 mill. Havana. 



Form fastigatum Maynard (pi. 31, figs. 10, 11, 12). Shell hav- 

 ing the contour of C. mumia chrysalis, cylindric or tapering. Fleshy 

 or bluish white, either uniform or zigzag-marked with gray-brown, 

 as in chrysalis. Lower 3 to 5 whorls ribbed as in chrysalis, the 

 whorls of the cone almost smooth. Aperture and peristome as in 

 chrytalis, the parietal lamella small or subobsolete. 



Matanzas ; Chorrera and Carmelo, near Havana. 



This form has the shape of chrysalis, but the ribs disappear above 

 as in infanda. It occurs both white and marbled. The number of 

 ribless whorls varies. Sometimes only the last 2^ are ribbed, while 

 other specimens have more ribbed whorls and establish a complete 

 transition to chrysalis, with or near which it occurs at Matanzas. 

 At Carmelo the two were found together. It is probably not a racial 

 variation. 



In my opinion, Strophia eurystoma ignota of Maynard, from 



