118 DOLABRIFERA. 



The Greenland habitat assigned for D. hollbblli is extraordinary, if 

 it be correct ; no other species of Aplysiidce being known from such 

 high latitudes. The list of some eighteen species here following may 

 be reduced by future investigation on the range of variation in the 

 shells ; but on the other hand the genus is one likely to be over- 

 looked by shell hunters, so that the discovery of additional new forma 

 may be anticipated. 



Species of the Cape and Indian Ocean. 



D. DOLABRIFERA Cuvier. PL 34, figs. 11, 12, 13, 16. 



Length 90 mill. Elongated, very slender anteriorly, the tentacles 

 slim ; dorsal slit small, pleuropodial lobes very close. Greenish, 

 spotted with black, especially below, and bristling with very acute 

 projections ; foot very wide. 



Shell very solid, very narrow, lengthened, curved ; very calcare- 

 ous, the epidermis being excessively thin ; form quadrangular, with 

 the apex distinct and a little calloused ; white, enamelled. Length 

 -9 mill. 



Island of Bourbon, on the slime under submerged stones, and in 

 brackish ponds near the shore (Rang !). 



Dolabella dolabrifera CUVIER, Regne Animal, (edit. 1) ii, p. 308, 

 (name only !). Aplysia (Dolabella} dolabrifera Cuv., RANG, Hist. 

 Nat. Aplys., p. 51, pi. 4, f. 1-6. 



When living the surface is seen to be covered with acute but soft 

 spine-like projections. The shell varies considerable with age, yet 

 it shows always, and perhaps more than in the other species of this 

 section, a quadrangular form. A shell very different in form from 

 the great majority of specimens was found in one individual collected 

 by Rang (pi. 34, figs. 14, 15), but the soft parts were the same as 

 usual, and it is regarded by Rang as abnormal. 



D. CUVIERI H. & A. Adams. PI. 34, fig. 28. 



Soft parts unknown. Shell solid, squarish, impressed with two 

 medial, indistinct, radiating canals ; beak produced, trigonal, with 

 thick, back-turned, square apex ; external and terminal margins 

 sinuated, end roundly acuminated. (Sowb^). 



Island of Bourbon. 



Dolabrifera cumeri H. & A. AD., Gen. Rec. Moll., ii, p. 33, pi. 59, 

 fig. 4a (no description). SOWB., C. Icon., xvi, f. 4, 4a. 



