102 CAREL1A. 



not a carinated shell, and the surface was perhaps smoother 

 than in K. kauaiensis. The immediate ancestor of Carelia, 

 in other words, was probably a Kauaia-like shell with angu- 

 lated base, smooth whorls and had a twisted columella with a 

 small perforation. This form, if in existence now, would 

 probably be placed between Cyclamastra and Kauaia on ac- 

 count of its columella and aperture, or be classified as a 

 primitive form of Kauaia itself" (Hyatt). 



The amastroid stage of Carelia is shown in pi. 16, fig. 7, 

 representing the neanic stage of C. bicolor. 



Key to Species of Carelia. 



a. Later whorls angular or subangular at the shoulder ; per- 

 iphery flattened, base obtusely angular. 



&. Diameter nearly half the length ; no spiral striation ; 

 25x12 mm. with 6% whorls. C. b. angulata, no. 10 /. 

 ft 1 . Longer, more slender, whorls 7 to 9. 



c. Last Whorl very dark and smooth, strongly bi- 

 angular, with a creamy zone above the angle; 

 diam. one-third the length, or more. 



C. cumingiana, no. 9. 



c 1 . Last whorls biangular, the upper angle rounded, 



striate, lower angle strong; red-brown with a 



sutural light line ; diam. less than one-third the 



length, 47x14 mm. C. rigida, no. 8. 



c 2 . Lower angle rounded, upper acute or weak; 



usually a broad white zone below suture ; shell 



long, slender. C. dolei, no. 7. 



a 1 . Whorls not angular at the shoulder. 



6. Later whorls having more or less coarse spiral stri- 

 ation. 



c. Length usually less than 40 mm. ; red-brown 

 with a white band below suture; strong, un- 

 equal spiral cords. C. cochlea, no. 6. 

 c 1 . Similar but with well-rounded last whorl and 

 few, very weak spirals. C. bicolor, no. 10. 

 c 2 . Larger shells, length 45 to 80 mm., with dark 

 base and lighter color above. 



C. turricula, no. 1 ; C. paradoxa, no. 2. 



