FAMILY CALYPTRIAD^ CREPIDULA. 159 



Color. Ashen brown, with spots or stripes of a dark reddish brown ; within dark chesnut ; 

 the diaphragm ligliter brown and bluish ; the edge white. 



Length, 0-2. Width, 0.1. 



This small species is found attached to seaweed or to stones ; it is not so common as the 

 preceding. It occasionally reaches the length of half an incii, but I have never seen it of 

 this size on our coast. 



Crepidula glauca. 



Crepidula glauca. Say, Jour. Acad. Nat. Sciences, Vol. 2, p. 226. 

 C id- Gould, Invertebr:ila of Mass. p. 161, fig. 14. 



Description. Shell moderately small and convex, broadly oval, thin, nearly smooth, with 

 minute transverse wrinkles. Apex conic, pointed, projecting, somewhat beyond the surface, 

 and nearly to the plane of the aperture. Diaphragm less than half the length of the shell, 

 with an irregular surface, partly convex and concave, deeply seated, and with a small cavity 

 under the apex : edge of the diaphragm curved. 



Color. Gre:'nish grey, maculated within dusky ; within uniform chocolate-brown : diaphragm 

 yellowish white or opake white. 



Length, 0-5. Width, 0-28. 



This species is said to occur on our coast, but my specimen was from Rhode-Tsland. 



(EXTRALIMITAL.) 



C. depressa. (Say, Ac. Sc. Vol. 2, p. 225.) Much depressed, nearly equilateral, transversely wrinkled: 

 apex not curved, forming a simple acute terminal angle upon the margin of the aperture, which is 

 subovate. Diaphragm convex; edge contracted in the middle and at one side. Color: epidermis 

 pale yellowish brown; within white. Length, 0-8. Southern Coast. 



C.intorta? (Id. lb. Vol. 2, p. 227.) Convex-ovate, with about 20 elevated somewhat undulated lines 

 with alternate smaller ones, somewhat confused on the convex side, the larger ones with a few 

 slightly elevated very thick tubercles; apex curving laterally; tip pointing upwards, and not 

 elevated from the body of the shell. Southern Coast. 



