he body. Length, 1 inch ; breadth, 0.25 inch. On roeky bottoms, in the 

 coralline zone. 

 Hah. False Bay, Cape of Good Hope. 



16. Triopa lucida. Depressed, broadest anteriorly ; clavate appendages 

 constricted at their bases, in number about forty, numerous and small in size at 

 the head, the posterior ones largest. Tentacula long, with about twelve lami- 

 nae. In front of each tentacle, near the margin, stands a clayate process much 

 longer than the others. Branchiae consisting of three plumes, about equal in 

 size. Color uniform transparent white, except that the tentacula, branchiae, and 

 appendages are all of a yellowish color towards their extremities. The tips of 

 the clavae appear open or hollow from their transparency. Length, 0.8 inch. 

 Found under stones, at low-water mark. 



Hab. Cape of Good Hope, at Simon's Bay. 



17. GoNioDORis ? OBSCURA. Obloug, quadrilateral ; cloak broad, widely projec- 

 ting so as to conceal the oral tentacles anteriorly, and tapering from opposite 

 the branchiae, to a blunt point behind, disclosing the foot, which extends further 

 to a distance of one-fourth the length of the body. Dorsal tentaculae elonga- 

 ted, retractile, smooth and glossy to appearance, but having from twelve to four- 

 teen laminae. Branchite retractile, consisting of twelve elongated, simply-pin- 

 nate leaflets, which form a cup around the anus. Color a dark greenish, or 

 yellowish grey, with numerous black and yellow dots ; a row of black spots is 

 conspicuous, margining both the mantle and the foot. Head and oral tentacles 

 bluish-grey. Dorsal tentacles with red tips. Length, IJ inches ; breadth, 0.3 

 inch. Found among soft sponges in the circumlittoral zone. 



Hab. Australia, at Port Jackson. 



This species, with another closely allied and occurring in the same locality 

 form a genus probably new. It differs from Goniodorus, in having retractile ten- 

 tacula, and in the greater development of the mantle ; and from Doris by the 

 elevated, oblong, quadrangular shape of the body. I would propose for it the 

 name of Hypselodoris. 



18. Doris obtusa. Body very convex above ; of a pale yellowish color, with 

 brownish spots ; mantle covered with minute crowned tubercles. Tentacula 

 short, of a purplish brown color, with five transverse laminse at their tips, 

 where they are broadly and obliquely truncated. Branchiae consisting of a 

 crown of eight short, simply pinnate leaflets. Length, 0.35 inch. Found 

 among sponges in the circumlittoral zone. 



Hah. Australia, at Port Jackson. 



19. Doris excavata. Broad, depressed, of a yellowish color ; mantle widely 

 expanded, covered with minute, distant, tubercles. Foot broad in front, narrow 

 behind and projecting a little distance beyond the posterior margin of the man- 

 tle. Tentacula of a purplish-brown color. Branchife consisting of five large, 

 much branched plumes, which are retractile into a large, widely-open cavity. 

 Length, 0.7 inch; breadth, 0.4 inch. Found among stones, etc., in the cir- 

 cumlittoral zone. 



Hab. Australia, at Port Jackson. 



TURBELLARIA. 



20. Leptoplana patellabum. Large, dilated, depressed, nearly ovate in shape, 

 broadest behind. Eyes in four clusters ; the anterior ones elongated and near- 

 est each other ; the posterior ones rounded and situated on wart-like protube- 

 rances. Color above dark yellowish, mottled, darkest in the middle ; below 

 white. Length, 0.9 inch : breadth, 0.65 inch. Found under the large lime- 

 pits which are common on the rocks at half-tide in Simon's Bay, Cape of Good 

 Hope. 



DIONCUS, n. g. Corpus planum, dilatatum. Caput corpore continuum. Os 

 subcentrale. Ocelli numerosi, in umbones duos claros subdistantes dispositi. 

 Maricolae. 



