156 DOLABELLA. 



with one observed by us at the Isle of France, which we do not 

 doubt is a variety of it. Our individual is 9-10 inches long, very 

 plump, especially behind, the head being small and oval, a little 

 swollen and well distinguished from the foot, the mouth large and 

 rounded. The entire body is covered with coarse tubercles and 

 papillae, some of which are branching; they are most numerous be- 

 hind the head. The foot is slightly differentiated from the upper 

 surface, and is deep sienna color, with greenish tints in some spec- 

 imens ; Flanks and back are dirty green mingled with yellow, with 

 blackish plaques in some places, especially on the rather rounded 

 hind part. Others have brown and yellowish spots on the sides. 

 Shell very large, the spire extremely rugose. This mollusk emits a 

 great quantity of violet liquid. It was found in great abundance 

 during October and November in the warm, quiet waters of the ilots 

 aux Cerfs, at Mauritius. 



Compared with the original figure of D. hasseltii, this form is more 

 sparsely blotched with dark, and the dorsal slit is much shorter and 

 does not extend so far forward. The value of these characters can 

 only be decided by a comparison of abundant material. 



D. ELONGATA Sowerby. PI. 27, figs. 31, 32. 



Soft parts unknown. Shell oblong, arched, much attenuated, con- 

 centrically slightly wrinkled within, radiately subplicated, callus 

 spirally plicated, tumid, widely expanded over the back, widely re- 

 flected upon the margins as far as the end ; terminal margin angu- 

 lar, epidermis brown tending to orange. (Sowerby'). 



Seychelles (Brit. Mus.). 



D. elongata SOWB., Conch. Icon., xvi, pi. 1, f. 2a, b (Oct., 1868). 



It is barely possible that this may be a monstrous example of 

 Dolabella rumphii. It presents, however, an appearance so ex- 

 tremely different, that it would hardly be just to leave it without a 

 name. (Sowb.) 



D. HEMPRICHII Ehrenberg. 



Six inches long ; warty ; pale green, the posterior corona and two 

 dorsal bands olive-blackish and rugulose. Body elongate conic, 

 attenuated forward, obliquely truncate and very thick behind, with 

 an exactly circular posterior area. Length 6, breadth 2 inches. 

 Surface warty, especially in a circle around the posterior area and 

 in two bands along the back, the remaining parts being more 

 glabrous. Round posterior area bounded by a crispate, contractile 



