214 Transactions.— Zoology. 
the apex, flatly spreading; colour dark-purplish, sometimes mingled with 
greenish-yellow. The branchie are capable of complete retraction within 
a common cavity, the edges of which have usually a greenish-yellow tinge. 
Foot large, with thick and high sides, sole uniform flesh colour. Mouth 
large, tubular. Oral tentacles unusually long, slender, linear, cylindrical, 
often protruding beyond the edge of the mantle when the animal is 
crawling. Odontophore broad, of about 28 rows of teeth. No central 
teeth, lateral about 60 on each side, smooth, strongly arched, all similar in 
shape, 
- [have obtained several specimens of this species on rocky ground in 
Auckland Harbour. 
Doridopsis mammosa, Abraham, P.Z.S. 1877, p. 266, pl. XXIX., 
figs. 20, 21. 
Mr. Abraham states that this species was collected by the Antarctic 
Expedition, but its native country appears to be unknown to him. I have 
no doubt, however, that it is identical with a species found abundantly on 
Zostera beds from Mongonui to the East Cape, and perhaps further south. 
The Antarctic Expedition probably obtained it at the Bay of Islands, where 
it is not uncommon. The following description, drawn up from fresh 
specimens, will afford some information on certain points, such as colour, 
etc., which could not be made out from the alcoholic specimens described 
by Mr. Abraham. 
Body 2-4 inches long, broadly elliptical, back moderately elevated. 
Mantle large, usually extending on all sides beyond the foot, margins thin 
and semi-transparent, much undulated. On each side of the back is a row 
of 3 or 4 large conical or clavate erect processes; two similar ones are 
placed close together between the dorsal tentacles. Numerous much 
smaller tubercles are scattered irregularly over the back and sides. Along 
the back, between the processes, is a median row of three (rarely two) large 
lozenge-shaped smooth areas, free from tubercles or projections of any kind. 
On each side, a similar row of four or five smooth areas extends from the 
dorsal tentacles to the branchie, on the outside of the row of processes. 
These areas are coloured a deep velvety brown-black, and each contains 4 
central spot and a few lateral specks or streaks of an intense greenish-blue, 
of almost metallic lustre. The remainder of the mantle is a light brow? 
or fawn colour, always marked (especially towards the margins), with 
numerous delicate whitish or greyish parallel longitudinal lines, which are 
more or less continuous towards the margins, but are irregular and broken 
on the back. Dorsal tentacles (rhinophores) rather small, clavate, the 
upper portion bent and diagonally laminated, tip thickened and rounded ; 
the whole retractile into cavities that have raised sheath-like edges. Brat 
