578 DORIDID.E. 



3. P. ocELLATA, Aldei* and Hancock. 



Ann. Nat. Hist. vol. ix. p. 33, and Monog. pt. 2, fam. 1, pi. 2.3. 



Body (less than an inch in length) lanceolate-oblong, 

 convex, greenish black, mottled with large yellowish 

 tubercular spots. Tentacula elongated, with tumid bases, 

 and clavate (seven or eight) laminated tips ; head- veil 

 small, many-lobed. Branchial plumes five, large, sub-tri- 

 pinnate, unequal, their appendages lobed and branched, 

 whitish. Foot pale. 



It inhabits the shore between tide-marks, and shallow 

 water. It has been taken on the Northumberland, Devon, 

 and Dublin coasts (Alder and Hancock). 



IDALIA, Leuckart. 



Body oblong, broad, more or less smooth, a semicircle of 

 filamentous appendages surrounding the branchial region 

 of the back. Dorsal tentacula linear, laminated, susten- 

 tacular simple appendages anterior to, and distinct from 

 them. No produced oral tentacles, but a veil. Vent 

 dorsal, surrounded by plumose branchiee. 



1. I. ASPERSA, Alder and Hancock. 



Monog. part 1, fam. 1, plate 26. 



Body (half an inch in length) thick, broad, oblong, 

 rounded in front, tapering to a point behind ; yellowish, 

 blotched and spotted with brown and orange ; sides 

 speckled with opaque white. Dorsal tentacles linear, 

 delicately laminated, reflexed. Tentacular appendages 

 four, long, tapering, subsequal; their bases approximated and 

 close to those of the tentacles. Branchial plumes twelve, 



