154 PROCEEDINGS OF SOCIETIES. 



time, a supplement of those eastern species (some of them of extreme 

 interest, and one of H. pusiola, not previously here recorded), which 

 have occurred to me since. 



Although such a large number of Crustacea (sixty-three out of 

 eighty-seven species) are recorded in this paper, yet, during a day's 

 dredging in Galway Bay on the 27th of March last, when in company 

 with Professor Melville, among twenty- two species which rewarded our 

 labours, three occurred which had not been previously met with there 

 by him, viz., Portunus holsatus, and Pandalus annulicomis, and a 

 young specimen of Portunus marmoreus, a species hitherto unrecorded 

 save in Birterbie Bay. 



DISTRIBUTION OF SPECIES NOT INCLUDED IN DUBLIN LISTS. 



References as in former paper — A. G. M., Professor Melville. 



Achceus Cranchii. — The only Irish specimen on record, formerly in 

 J. V. Thompson's collection, was lost previous to the transfer of that col- 

 lection to the Royal Dublin Society. 



Pisa tetraodon. — First discovered by W. M'Calla. 



" I am the only person who as yet has found this species in Ireland ; 

 its habitat is within two miles of Roundstone, in a pool at about half tide- 

 mark. As particular situations are distinguished by algae growing in 

 the pools, it may, therefore, be well to state the plants in that under consi- 

 deration : — Gelidium corneum, Polys, fruticosa, and Cystos. ericoides. 

 Owing to changes in the pools, I have not lately obtained this species ; 

 I have not found it in lobster-pots, and rarely under stones." — Saunders 1 

 News-Letter, January 9, 1845. 



Xantho rivulosa. — I find I was in error in stating this crab had not 

 occurred to M'Calla. At least, a card has lately turned up in the Royal 

 Dublin Society's collection, labelled " Xantho florida, Roundstone," 

 which was most probably part of the collection purchased from M'Calla ; 

 on this, undistinguished by any mark from numerous specimens of 

 X. florida, is a fine male specimen of X rivulosa, which must have 

 escaped M'Calla's notice. It would then appear to be generally dis- 

 tributed along the south and western coast. 



HookHead (R.B.) — Valentia Island, Galway Bay (A. G. M.), Round- 

 stone Bay (W. M'C), Portrush (0. C.) 



Portunus marmoreus. — Galway, Roundstone (W. M'C.) 



JEbalia Bryerii. — Belfast (0. C.), Galway (A. G. M.), Roundstone 

 (W. M'C.) 



JSbalia Cranchii. — Belfast (0. C), Portmarnock, Co. Dublin, q. v. 

 (R. Ball), Roundstone Bay (W. T.) 



Thia polita. 



I had the pleasure of seeing this crab dug out of its sandy home. 

 Professor Melville having kindly accompanied me to the station where, 

 in 1850, he first met the species, — a fine female specimen, that now 

 before your Society, was the only one met with. It bore the journey to 



