found in Dublin Bay and its vicinity. 133 



Ophiura texturata. Solaster endeca. 



O. albida. S. papposa. 



Ophiocoma filiformis , a single s])e- Asterias aurantiaca. 



cimen. Spatangus purpureus. 



0. rosula. Echinus sp/icera. 



Uraster rubens. Amphidotns cordatus. 



U. violacea. Echinocyamus pusillus. 

 Cribella oculata. 



MOLLUSCA. 



Doris tuber culata, not common. 



D.bilmnellata, Johnston. Syn. D. verrucosa, Fleming's Brit. Anim. 

 The peculiar arrangement of the branchiae of this species is over- 

 looked by Dr. Johnston, the specimens from which his description 

 of the species was derived having been preserved in spirit. As I 

 had an opportunity of comparing several living specimens together, 

 it may be as well perhaps to subjoin a description of its outward 

 characters. 



Length one inch and three-fourths ; Ijody ovate, the larger end 

 anteriorly depressed ; cloak tuberculated, mottled with deep brown ; 

 tubercles rounded, white, elevated, and not all of an equal size ; a 

 broad band of brown, ^ of an inch in width, passes along its centre, 

 commencing at the dorsal tentacula and terminating at the branchiae ; 

 the tentacula also are encircled by a brown shading. Branchiae 

 conical, pinnate, varj'ing from twenty-four to thirty in number, ar- 

 ranged in the form of a crescent or like the capital letter C, the horns 

 of the crescent being much incurved ; the convexity is anterior ; 

 the branchiae are longest in the centre of the crescent and diminish 

 greatly towards either side. A short process is frequently seen be- 

 tween many of the branchiae, having somewhat the appearance of 

 the remains of a branchia which had been broken off ; tubercles also 

 cover the space enclosed by the branchial aj^paratus : dorsal tenta- 

 cula thick at the base, conical, and without a sheath surrounding 

 them. Number of branchiae in j'oung specimens as many as in ma- 

 ture ones. 



It deposits its ova in ribbon- like gelatinous masses early in the 

 month of March. 



Found in great abundance atWilliamstown above low-water mark. 

 Doris pilosa, not at all common. 



Several varieties of a Doris occur at the same locality as Doris 

 verrucosa, which I was at first incUned to regard as a variety of Doris 

 pilosa, but which I now am inclined to consider as distinct from 

 that species, from which it differs in several particulars ; in having 

 the dorsal tentacula surrounded by a notched sheath ; in size, the 

 largest specimens attaining the length of one inch and three-eighths ; 

 and in colour, which is various. One variety of this elegant Don's is 

 of a soot-like black colour, and this is evidently the Doris nigricans 

 of Fleming. A second principal variety is of a delicate and lively 

 canary colour. All the other varieties present different shades of 

 these two colours, or are colourless or pure white ; tliis last variety 

 is frequently met with. 



