330 On Pterochilus, and two new species of Doris. 



alternating, rather large, elliptical, bright orange-red, enveloped 

 in transparent sheaths, spotted with opake white. The gastric 

 vessel may be seen through the transparent skin of a pale orange 

 colour, running in an undulating line down the back and sending 

 off alternate branches to the papillse. Foot linear, transparent, 

 flesh-coloured, rounded in front and not produced at the sides. 

 Tail rather short and blunt. Length T 3 yths of an inch. 



Found on a stone at low water mark on the west side of 

 Rothesay Bay, Isle of Bute. 



Doris flammea. — Body ovate, rounded at both ends, of a bright 

 orange-scarlet ; occasionally blotched with purple. Cloak covered 

 with short, obtuse, spiculose tubercles, of unequal sizes, smallest 

 towards the edge, which is thin and extending beyond the foot. 

 Dorsal tentacula rather large, tapering, orange, with ten or eleven 

 scarlet laminae and imperfect intermediate ones; the orifices 

 strongly tuberculated at the edges. Branchiae composed of nine 

 scarlet plumes, rather paler than the body, three or four times 

 pinnate, retractile within a single cavity. Head small, the veil lobed 

 and slightly produced at the sides. Foot deep scarlet, rounded be- 

 hind. Under side of the cloak granulated and spotted with opake 

 yellow. Length nearly an inch, breadth one half as much. 



Dredged up on Pecten opercularis in shallow water, Rothesay 

 Bay. 



This species comes very near to Doris tuberculata, but has the 

 tubercles and branchial plumes rather smaller, and is of a differ- 

 ent colour. Of two specimens found, the largest was of a uniform 

 scarlet ; the other scarlet, with a few blotches of purple on the 

 back, and a pale purple or lilac margin to the branchial plumes. 



Doris mera. — Body white, rather broad and elevated on the 

 back. Cloak covered with moderately sized, unequal, round tu- 

 bercles ; spiculose, the spiculae radiating from their base. Ten- 

 tacula without sheaths, pale yellow, much inclined backwards and 

 thinly lamellated, with four or five broad plates and imperfect 

 intermediate ones. Branchiae of 13 tripinnate, colourless plumes, 

 set closely round the vent and forming a beautiful cup, retractile 

 within a common orifice. Head small, square, with the anterior 

 angles a little produced. Foot transparent yellowish white, rather 

 straight, not extending beyond the cloak behind, the front trans- 

 versely slit and the upper part notched in the centre. Length 

 Jths of an inch. 



Found under a stone at low water mark, Cullercoats. 



The nearest allies to this species are D. aspera and D. repanda, 

 between which it holds an intermediate place, but is perfectly di- 

 stinct from either of them. From D. aspera it differs in having 

 the tubercles smaller and more numerous, and in the different 

 form of the head, tentacula, and branchial plumes. On the con- 



