1855.] 389 



tacula, and in the greater development of the mantle; and from Boris 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 laminae at their tips, 

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

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

 among sponges in the circumlittoral zone. 



Hab. 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 bpyond the posterior margin of the man- 

 tle. Tentacula of a purplish-brown color. Branchiae 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 stone3, etc., in the cir- 

 cumlittoral zone. 



Hab. Australia, at Port Jackson. 



TURBELLARIA. 



20. Leptoplana patellarum. 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 ware- 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, Gape of Good 

 Hope. 



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

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

 Maricolae. 



21. D oncds badius. Body half as broad as long, of a reddish-brown color, 

 above, with a flake-white dust intermixed. Anteriorly there are two colorless, 

 slightly prominent, circular knobs, which contain, scattered over the whole sur- 

 face, the very numerous and minute eyes. Below, the body is of a pale sepia 

 color, except the white digestive organs ; and the mouth is placed behind the 

 centre. Length, 1.5 inches; breadth, 0.75 inch. Found under stones in the 

 littoral zone. 



Hab. Australia, at Port Jackson. 



22. Dioncus obloxgus. Oblong-oval, of a pale, transparent, brownish-grey 

 color above. Eye-clus ers two, black, conspicuous, each surrounded by a ring 

 of white; the few large eye spots being crowded together at the summit only of 

 the oculiferous knobs. Length, 1 inch ; breadth, 0.35 inches. Found under 

 stones in the littoral zone. 



Hab. Australia, at Port Jackson. 



23. Thysanozoon Australe. Oval, rather broad, of a dark color, mottled 

 with blackish and brownish above; papillae large, about sixty in number, nearly 

 equal in size on all parts of the body. Eyes numerous, in an oval white patch 

 between the bases of the tentacula, which is nearly divided in two by a wedge- 

 shaped clear space entering from behind. Length, 1 inch; breadth, 0.6 inch. 

 Found on soft sponges in the circumlittoral zone. 



Hab. Australia, at Port Jackson. 



24. Valencixia annulata. Elongated, convex above : head broad, abruptly 

 truncated in front with a slight sinus at the middle, rounded at the sides and 

 narrowing gradually to the neck. Color purplish-brown, with a pale-yellowish 

 band across the head, and a narrow white annulation around the body just be- 



