132 DE. CUTHBERT COLLLNGWOOD ON SOME NEW SPECIES OF 



is bordered and streaked like the mantle. The tentacles have a white ring, sometimes 

 two rings, round the sheaths ; they are reddish above, deepening to dark brown below ; 

 rows of opaque white spots are arranged nearly regularly, parallel with the lamina? ; at 

 the apex is a small whitish ring. The branchiae are reddish, the inner side of the stems 

 of the leaflets marbled below with brown and white ; the whole branchial tuft studded 

 like the tentacles with minute spots of opaque white, having a very beautiful appearance. 

 The under surface of the foot is white, with an orange border, like the mantle ; the sides 

 of the foot striped as above, only the white lines are whiter, but less distinct, and the dark 

 body-colour paler. 



This is a remarkably handsome species. The longitudinal white striae become widened 

 when the animal is at rest, and very much attenuated when in progression. The branchiae 

 and tentacles look as though studded with little pearls. It is somewhat remarkable 

 that these animals never floated upon the surface of the water while under observation, 

 and if placed upon their backs always immediately turned over. 



These specimens w r ere taken upon a reef east of the island of Labuan, Borneo, and one 

 on the adjacent islet, Pulo Pappan, in August. 



Chbomodoris Alderi, Coll., n. sp. (Plate IX. figs. 34-37.) 



Length 2 inches. Mantle capacious, covering the head, squarish in front, slightly 

 emarginated. Dorsal tentacles very small, and placed upon very short pedicles, finely 

 laminated, having the commissure anterior ; they have precisely the appearance of small 

 cochineal insects. Branchial of ten simple four-sided angular leaflets, some of them 

 bifurcating near the apex, arranged in an imperfect circle, curving outwards and sur- 

 rounding the anal orifice. Head with two small white oral tentacles. Foot somewhat 

 tubular posteriorly, and extending about \ inch beyond the mantle. 



Colour and general appearance. — General body-colour an opaque yellowish white or 

 cream-colour, a border of bright orange running all round the edge of the mantle and 

 projecting portion of the foot. Back beautifully marbled with reddish brown, an irregular 

 row of carmine spots placed all round the marbled portion, between it and the orange 

 border. Tentacles laminated alternately with crimson and white. Branchiae reddish, 

 the angles crimson. Under surface of a delicate transparent white. 



A most beautiful species, slow in its movements, which were confined to crawling and 

 floating upon its back. One specimen only, found between tide-marks in a sandstone 

 rock-basin in Ke-lung Harbour, North Formosa, May 31st. I have named it after the 

 late Mr. Joshua Alder, whose name will always be connected with the history of this 

 elegant order of Mollusca. 



Genus Albania, Collingwood, nov. gen. (1878). 



Corpus depressum, niolle, semipellucidum. Notseuin amplissimum, undulatum et inversum. Rkino- 

 plioria flexibilia, sine vaginulis. Caput velo bilobato obsituru. Branchiae e circa 7 foliolis, 

 separation retractilibus, compositse. 



Body depressed, soft, semitransparent. Notaeurn (mantle) ample, undulated, and 

 turned up at the sides. Dorsal tentacles (rhinophoria) flexible, without sheaths. 



