118 DOLABRIFERA. 
The Greenland habitat assigned for D. hollbélli is extraordinary, if 
it be correct; no other species of Aplystide 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 forms 
may be anticipated. 
Species of the Cape and Indian Ocean. 
D. poLABRIFERA Cuvier. PI. 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 caleare- 
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 Spiarereee stones, and in 
brackish ponds near the shore (Rang!). 
Dolabella dolabrifera CuviER, Regne Animal, (edit. 1) ui, p. 398, 
(name only !).— Aplysia (Dolabella) SD Rat Cuv., Rane, Hist. 
Nat. Aplys., p. 51, pl. 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 (pl. 34, figs. 14, 15), but the soft parts were the same as 
usual, and it is regarded by Rang as abnormal. 
D. cuviert 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 cuvieri H. & A. Ap., Gen. Rec. Moll., ii, p. 33, pl. 59, 
fig. 4a (no description).—Sowpe., C. Icon., xvi, f. 4, 4a. 
