DEVELOPMENT OF CYPRJ3A. 491 



pale brownish-black, with minute whitish specks ; that, of 

 C. caput-serpentis is of a rich green-brown ; and in 

 C. lynx the mantle is covered with numerous tufts of 

 various forms, nodulous, trifid, or ending in two short 

 processes ; that of C. Mauritania has conical tubercles ; 

 of C. erosa, numerous rather long branching arborescent 

 appendages ; of C. moneta with but few, and those chiefly 

 around the free upper edge of the mantle ; while in some, 

 these processes are altogether wanting. In Cypraa an- 

 nulus the siphon is of a dirty- white colour, the tentacles 

 orange, the eyes black, the mantle brown, covered with 

 small dark spots, the foot white, with black reticulated 

 markings. In Cyprcea err ones the mantle is light 

 brown, perfectly smooth, and covered with dark brown 

 reticulations ; the foot is brown, with minute white spots; 

 the peduncle of the eye is of a brilliant white ; the head 

 is brown ; the base of the tentacles is a dull white ; the 

 tentacles beyond the eyes, light brown. In Quoy's figure 

 (Voy. Astrol. t. 48, f. 18) of Cypraa Isabella, the edge of 

 the mantle is simply lobed, and the remainder of the 

 surface naked and void of appendages. In the animal of 

 C. errones the edge of the cloak forms a continuous 

 slightly-waved line, and the surface covering the shell is 

 perfectly smooth, and adorned only with the delicate 

 anastomosing lines mentioned above. 



The young of Cypraa, when first they issue from the 

 ovum, are provided with two membranous alar expansions, 

 like some of the Pteropods, and a delicate hyaline, simple, 

 spiral, flattened, ear-shaped shell, which fully confirms the 

 observation of Professor E. Forbes, who observes, speaking 

 of the Gasteropoda generally, that "they all commence life 

 under the same simple form, both of shell and animal ; 



