574 DORIDIDiE. 



usually three, linear, and bipiiinate. The skin is charged 

 with spicula of various shapes. 



It inhabits v^arious depths from low- water-mark to 

 twenty fathoms, and has been observed at localities on all 

 sides of great Britain and Ireland. It ranges to the 

 Norwegian seas. 



^GIRUS, LovEN. 



Body oblong or elongated, covered with very large 

 tubercles. Tentacles linear, simple, retractile, within 

 prominent lobed sheaths. Branchial plumes dendritic, 

 placed about a dorsal vent. 



1. JEi. puNCTiLucENs, D'Orbiguy. 



Plate A. A. A. fig. 2. 



Poli/ccm pundiliKens, D'Orb. Mag. Zool. vol. v. p. 7, pi. lOG. — Thompson, 



Ann. Nat. Hist. vol. xv. p. 31-3. 

 yE</ircs punctilucens, Loven, Index. Moll. Scan d. p. 6. — Alder and Hancock, 



Monog. part 4, fam. 1, pi. 21. 

 Doris mauru, Forbes, Ann. Nat. Hist. vol. v. p. 103, pi. 2, f. 17. 



This very curious sea-slug is of a lanceolate shape, very 

 gibbous on the back, and rough, with large obtuse, some- 

 what truncate tubercles. It varies in colour from a 

 purplish fawn to jet black, always more or less mottled 

 with blotches of brown, and minute specks of white, but 

 more especially decorated with symmetrically ranged spots 

 of the most brilliant and lustrous greenish-blue, which 

 shine like phosphorescence. The tentacula are linear, and 

 rather obtuse ; their sheaths are tuberculated or lobed. 

 The oral tentacles are but slightly developed. The 

 branchial plumes, three in number, are imperfectly tri- 

 pinnate. The foot is pale, salmon-coloured or whitish. 

 The skin is studded with spicula. It is less than an inch 

 in lens'th. 



