22 
closely freckled with whitish, and broadly margined on both sides 
with the dorsal colours intermixed. 
Length 3 inches. 
Station, among sea-weed on the coral reefs. They were very 
sluggish in confinement. One specimen, when placed in a glass jar, 
voided about a dozen small Bulle, shells perfect. They differ but a 
trifle in colour, some being darker than others. The foot always re- 
mains turned over on the sides of the body. 
10. PHILINOPSIS NIGRA. 
Oblong, slightly rugose above. Head-disk rather more than one- 
third of the length of the animal, oblong oval, acutely rounded 
in front and rounded posteriorly. The mantle lobe rather wider 
than head disk, of an oblong-oval shape, and the lateral ends of the 
truncation prolonged posteriorly into compressed crenate lobes, 
which are continued over the truncated portion, forming a slight 
crest. No visible eyes or tentacles. Shell buried in the truncated 
end. Foot elliptically oval, smooth, revolute laterally. Branchial 
plume single, situated on the right posterior end, and curving to the 
left. Colour black, with two large white spots on anterior end, 
also two on the head disk and two on the mantle lobe ; sides white, 
and foot white, with three large black spots on each revolute side. 
Found on sea-weed in the upper laminarian zone. 
11. DoLABELLA VARIEGATA. 
Oblong, rugose, covered with small acute tubercles and more or 
less acute ridges; the tuberculations are scabrous, and furnished, 
as well as the different portions of the body, with pale, soft cirrhi, 
which are most conspicuous on the head. The posterior portion 
is obliquely truncated, from which part the body gradually tapers to 
the head; the surface of the truncation is convex, with the upper 
margin acutely elevated. The lobes of the mantle are closely ap- 
pressed, the left overlapping the right, leaving two openings on the 
back, one a little in advance of the truncation, and the other on 
its centre. Dorsal tentacles stout, deeply grooved laterally, and 
somewhat swollen. Head convex above. Oral tentacles short, stout, 
grooved laterally and much dilated outwards. Foot rugose, trun- 
cated in front, and acutely rounded behind, widest posteriorly. Co- 
lour greenish-olive, variegated with brown, white, and green ; inside 
of the lobes light brown dotted with white ; a stripe of tawny brown 
along sides of the foot. Foot dark orange. 
Length 10 inches. 
12. DoLABRIFERA OLIVACEA. 
Elongate pyriform shape, rounded posteriorly, rugose, and orna- 
mented with small filaments. Back convexly rounded. Mantle 
lobes small, rounded and closely enveloping the body, the right 
overlapping the left, leaving two small orifices ; a groove extends 
from the mantle lobes along the back and right side of head to the 
mouth. Dorsal tentacles grooved laterally and slightly dilating out: 
_ 
