576 dorididjE. 



2. T. viREscENs, Alder and Hancock. 



Body (three-tenths of an inch in length) rather convex, 

 smooth, of a peach-blossom hue, blotched anteriorly and 

 posteriorly with green. Tentacles broadly laminated, 

 green above, pinkish below, retractile within smooth-edged 

 sheaths. Branchial plumes five, green margined with 

 white. A single row of obsolete tubercles encircles the 

 branchial region. Foot white. 



This beautiful little animal was discovered at low-water 

 mark, on the oyster-bed at Bar Point, Falmouth, in 

 March, 1849, by Mr. Cocks, and described by the authors 

 of the British Nudibranchiate JNlollusca at the Ipswich 

 meeting of the British Association in 1851. 



POLYCERA, CuviER. 



Body oblong or elongated, smooth or tuberculated. 

 Tentacles clavate, pectinated, non-retractile, not sheathed. 

 A veil with marginal processes protecting the head. 

 Branchial plume pinnate, ranged about a dorsal vent, and 

 accompanied by clavate or tubercular appendages. 



1. P. aUADRILINEATA, MulleV. 



Plate Y. Y.fig. 5. 



Doris quadrilineata, MuLLER, Zool. Dan. vol. i. p. 18, pi. 17, f. 4-G ; and vol. iv. 

 p. 23, pi. 138, f. 5, 6. 

 „ cornuia, Abei.dg.aard, Zool. Dan. vol. iv. p. 29, pi. 145. 

 „ flava, Montagu, Linn. Trans, vol. vii. p. 79, pi. 7, f. 6. 

 Polycera lineata, Risso, Hist. Nat. Eur. Mcr. vol. iv. p. 30, pi. 1, f. 5. 

 „ /am, Fleming, Brit. Ann. p. 283. 



„ ornata, D'Orbigny, Mag. de Zool. vol. vii. p. 9, pi. 107. 

 „ tiipica, Thompson, Ann. Nat. Hist. vol. v. p. 92, pi. 2, f. 5. 

 „ quadrilineata , Thompson, loc. cit. pi. 2, fig. 6. — Alder, Ann. Nat. 



Hist. vol. iv. p. 338, pi. 9, f, 1-6. 

 ., cornuta, Loven, Index Moll. Scand. 6. 



