262 MR. P. S. ABRAHAM ON THE [ Mar. 6, 
Colour of the spirit specimens greyish white, clouded in parts; 
one example from Rodriguez, probably of the same species, is of a 
uniform dark grey. 
Length (in spirit) of a large specimen 75 millims., breadth 65. 
Hab. Mauritius ; Rodriguez. 
As in all the other species of Hewabranchus examined, there are 
apparently no mantle-spicules. 
The mouth is furnished with longitudinally-striated corneous 
lateral plates. The odontophore is large, with about 30 transverse 
rows of numerous lateral spines, which are large, upon elongated 
bases, and not so much recurved as in HH. aneiteumensis. 
ACANTHODORIS MOLLICELLA, sp. nov. (Plate XXX. figs. 1-4.) 
Body ovate, convex, soft. Mantle covering the back and sides, 
but not extending over the border of the foot, bearing above large, 
long, linear or subconical, soft papillee, which are especially numerous 
at the sides and around the branchie. Rhinophores long, slender, 
pointed, apparently conical and laminated far down; the denticu- 
lated sheath, through which each is retractile, has two of the antero- 
lateral divisions enlarged and produced into two long, flat, conical 
papille. Branchie 7 to 9, bipinnate, non-retractile, their bases 
united, and set in a star around the short tubular anal opening. 
Oral veil short from before backwards, with the lateral ends free and 
flattened. Foot broad and oblong, truncated (or the outline curving 
inwards) in front, and without a transverse groove; it is flatly 
rounded behind ; and the border all round is flattened, crenulate, and 
extending beyond the mantle, particularly posteriorly. 
The colour of the spirit specimens is a uniform dark greyish olive. 
Length (in spirit) 28 millims., breadth 17, height 11. 
Hab. Lord Auckland’s Islands. 
The mantle-spicules are comparatively few in number, small, 
spindle-shaped, and some rather bent. 
There is a very small spinous prehensile collar, between the 
laminze of which project two minute chitinous points (rudimentary 
lower jaw); its spines are very minute and recurved ; their shape 
could only be made out under a quarter-inch object glass. The 
odontophore is narrow and strap-shaped, and bears about 14 trans- 
verse rows of recurved spines; the two median ones of each row 
are large, with more or less quadrangular elongated and laterally 
flattened bases ; outside these on each side are about 6 minute rudi- 
mentary spines. 
ACANTHODORIS GLOBOSA, sp. nov. (Plate XXX. figs. 5-9.) 
Body ovate, broad, very convex, and inflated. Mantle mem- 
branous on the back and sides, reaching down over the foot, except 
perhaps quite behind, and bearing scattered, soft, conical, pointed 
tubercles, which are more numerous towards the border. The 
rhinophores are apparently rather short and slender, laterally flat- 
tened and retractile within sheaths, of which two of the marginal 
denticulations are enlarged. Branchiz 7, bi- (? tri-) pinnate, non- 
