156 PROCEEDINGS OF SOCIETIES. 



addition to the British Fauna in the Supplement to his British Stalk- 

 eyed Crustacea. Professor Melville himself was one of the first to point 

 out the apparent injustice done to M'Calla. 



The species, from my experience of it in confinement, is sluggish, 

 but a determined animal feeder, destroying even large bivalves, Actinise 

 and Palaemons, some 2 inches long; it is also apparently a night- 

 feeder. Galway Bay, Roundstone (W. M'C). 



MunidaRondeletii— Belfast(W.T.), Youghal(R.B.),Cove(J.V.T.), 

 Galway (A. G. M.), Roundstone (?) (C. P.). 



Crangon spinosus. — Cove (J. V. T.), -Galway (A. G. M.). 



Niha edulis. — Cove (J. V. T.), Roundstone (A. G. M.). 



Athanas nitescens. — Lahinch (W. T.), Ballyvaughan (A. G. M.), 

 Roundstone (W. M'C.). 



Supplemental Dublin species, pp. 80-87. 



Pirimela denticulata. — Dalkey Sound; dredged a single female spe- 

 cimen, May, 1857, loaded with ova. After it had been kept in a tank 

 for three weeks, the ova changed their colour from a bright salmon- red 

 to a dirty brown : this change examination with the microscope showed 

 to be dependent on the development of the zoes in the ova, their black 

 eyes showing plainly through the integuments. I was unable at the 

 time to examine them further ; and the following day, to my great re- 

 gret, I found that the ova were all shed, and the tank filled with zoes. 



These were extremely active, tumbling about in all directions, 

 swimming by alternately rolling up and unclosing their jointed bodies, 

 and throwing complete summersaults ; when they rested, it was on their 

 backs, the body supported on the dorsal spine. I do not know whether 

 this is the normal position for them or not. The abdominal false feet 

 were kept in perpetual motion. 



In figure (Plate IX., Pigs. 4, 5) they appear identical with zoes 

 bred by J. Y. Thompson from Cane, pagurus (Zoological Researches, 

 Plate VIII. , Pig. 1), as might have been expected from the close rela- 

 tionship of the genera ; indeed, I am inclined to think that the zoes of 

 the Brachyura, at least, will be found to be nearly undistinguishable, 

 the apparent difference in the figures published arising from the diffi- 

 culty of making perfect microscopic observations, arising from the 

 transparency of the various parts. If we compare the figures here 

 given with Thompson's figure of zoea of Pinnotheres pisum (Ent. Mag., 

 vol. iii., p. 85; Bell's British Crustaceae, p. 125), we will at once 

 perceive their strong similarity. Although I examined twenty or thirty 

 specimens of this zoe, I only succeeded twice in getting the lateral 

 spines in full view : they are represented rather too long in my figures. 



The spiny curvature was as follows : — Arising out of the centre of 

 the carapace a long, curved horn ; between the eyes a curved rostrum ; 

 on each branchial region a short scimitar-shaped horn ; and lastly, a very 

 short, slender, hollow horn, arising from the posterior edge of the cara- 

 pace at its junction with the abdomen. Three fine hairs, also, are found 

 arranged in a line along the median line of the carapace posteriorly. 



