GONIODOKIS. 571 



Oral veil produced at the sides into broad, flat, obtuse, 

 tentacula. Branchial plumes seven to nine, large, spread- 

 ing, not retractile. 



Length reaching to an inch and more. 



The authors of the " British Nudibranchs," regard the 

 fusca of Loven, the sublams of Thompson, and their own 

 similis as forms of this common species, often found be- 

 tween tide marks on all parts of our coasts. 



17. Doris subquadrata. Alder and Hancock. 



Alder and Hancock in Ann. Nat. Hist. vol. 16, p. 318, and Monograph, 

 part 5, fam. 1, pi. 16, fig. 1, 2, 3. 



Body oblong, rather elevated, white with a yellowish 

 tinge, semi-transparent. Cloak small, scarcely covering 

 the head, and exposing the foot, thickly covered with 

 small unequal papillse. Dorsal tentacles stout, issuing 

 from smooth-edged sheaths. Oral veil semicircular, with 

 produced obtuse angles. Branchial plumes seven, bipinnate, 

 not retractile. 



Length, one inch. 



A single specimen was dredged by Mr. Alder, near 

 Berry Head, Torbay. 



GONIODORIS, Forbes. 



Body oblong or lanceolate, smooth, or slightly tuber- 

 culated ; cloak small, exposing the head and foot, not 

 furnished with appendages. Tentacles clavate, laminated, 

 not retractile, nor invested with sheaths. Branchial 

 plumes ranged round a dorsal vent, without appendages. 



The angular shape and elongated outline of the animals 

 of this genus give them a habit very distinct from that 

 of Doris. Many of the exotic species are remarkable for 

 brilliancy of colouring, vivid blues, greens, reds and yel- 

 lows, often disposed in longitudinal stripes. 



