256 MR. P. S. ABRAHAM ON THE [ Mar. 6, 
terior arise from the bases of the neighbouring plumes; the anus is 
tubular ; the whole system is retractile into a cavity with a thin pro- 
duced and crenate margin. Oral tentacles small, elongate, conical, 
and rather flattened. Foot much narrower and smaller than the 
mantle, truncated and grooved, with the upper lamina enlarged and 
divided in front. 
General colour of the spirit specimens olive, with indistinct brownish 
patches on the mantle-border and on the foot. 
Length (in spirit) 57 millims., breadth 42, height 12; width of 
lateral mantle-expansion about 16 millims. 
Hab. Port Essington. 
The mantle-spicules are rather small, spindle-shaped, and inter- 
laced in bundles; they are absent in the extreme border of the 
mantle. 
Odontophore broad, with the numerous lateral spines reflected 
and bearing one or two small denticulations at the angle. 
Doris MUSCULA, sp. nov. (Plate XXIX. figs. 6, 7.) 
Body elliptical, convex. Mantle covering the head and the foot, 
bnt not laterally flattened or extended into a border; it is covered 
above with very small, close, equal, elongated, linear or subclavate 
tubercles. Rhinophores (not visible in the specimen) retractile into 
cavities, of which the mouths are produced into short tuberculated 
sheaths. Branchiz 9, small, simply pinnate, or bearing lateral 
lamin, and compressed ; the margin of the cavity into which they 
are retractile is fringed with small elongated tubercles. Oral ten- 
tacles rather flat and linear. Foot oblong, rounded at the ends, 
with a deep transverse groove in front, the upper lamina being thin 
and mesially divided ; it does not extend behind as far as the mantle- 
edge. 
Colour of the spirit specimen greyish, with a yellowish tinge 
beneath ; on the back is a longitudinal band of faint reddish brown, 
extending from between ‘the rhinophores nearly as far as the 
branchize, and bordered on each side by an equally broad indistinct 
blue band, shading into grey on the outer sides ; the two latter bands 
join together between the rhinophores and before the branchize. The 
coloration of these bands is produced by a very minute close freckling 
between the small tubercles. 
Length (in spirit) 13 millims., breadth 9, height 5. 
Hab. New Zealand. 
Doris PusTuLATA, sp. nov. (Plate XXIX. figs. 18, 19.) 
Body oblong-elliptic, rather convex. Mantle large, extending 
everywhere beyond the foot,-.and bearing large, separate, sessile, 
clavate, flattened, rounded, opaque tubercles, some smaller than 
others, which become more numerous and smaller upon the border. 
Rhinophores short, clavate, rounded, retractile through short sheaths 
which have the margins furnished with three tubercular processes— 
one on each side, and the third posterior and smaller. Branchie 8, 
small, bipinnate, the two posterior ones bifid, or indistinctly trifid, 
