124 MESSRS. ALDER AND HANCOCK ON 
stinctly angulated at the sides. Branchial plumes nine, small, simply pinnate, crimson, 
forming nearly a complete cup; the two posterior plumes smaller than the rest. Foot 
large, broadly truncated in front, and extended to a blunt point behind. Length 7>ths 
of an inch. 
One specimen only is preserved, which, from its diminutive size, may probably have 
been young. 
Family DORIDOPSID/, Alder & Hancock. 
Cloak large, without spicula or marginal appendages. Dorsal tentacles retractile 
within cavities; no oral tentacles. Mouth suctorial, opening on the front margin of 
the foot, without tongue, jaws, or collar; with a retractile proboscis. 
Genus Doripopsis, nov. gen. 
Body more or less depressed, ovate or elliptical. Cloak covering the head and foot, 
smooth or with soft tubercles. Dorsal tentacles laminated. Head minute, generally 
produced into small lateral lobes, without oral tentacles. Branchiz plumose, wholely 
or partially surrounding the vent on the medio-dorsal line, retractile within a common 
cavity. 
The chief peculiarities in the anatomy of Doridopsis are found in connexion with the 
alimentary system. In this genus there is no large rounded buccal organ, so constant 
in the Nudibranchiata. On the contrary, we see here, in the place of that powerful 
muscular apparatus, an attenuated suctorial tube or proboscis, which is capable of being 
protruded through a small circular orifice situated in the anterior margin of the foot. 
There is neither tongue, spinous collar, nor jaws, nor is there any armature whatever 
in connexion with this proboscidiform mouth. It is furnished, however, with two large 
folliculated glands, which pour their secretion through a slender duct into the anterior 
extremity of the proboscis. The secretion thus supplied may perhaps be a solvent, to 
enable the animal to penetrate the calcareous covering of its prey, and thus to reach its 
food, or it may be a poisonous fluid to benumb its victims. From the position of these 
organs, they might be supposed to be salivary glands ; but the true salivary glands are 
present, situated as usual at the commencement of the cesophagus, though they are so 
small as to be almost rudimentary. They are in the form of irregular masses placed 
one at each side of the alimentary tube, just where it joins the posterior extremity of 
the proboscis. At this point the cesophagus is somewhat constricted, but it almost 
immediately enlarges into an elongated anterior stomach or crop. On reaching the 
anterior border of the liver it is again contracted a little, and, penetrating that viscus, 
it opens into the true stomach, which is of considerable extent. The liver itself is bulky, 
