igii- Noies. 77 



Mollusca and a Cumacean new to Ireland. 



The Neomenians, Rhopaioiiu'iiia ai;laopheiiiae (Kov. and Mar.) and 

 Myzomenia banyulensis (Pruvot) have hitherto been recorded only from 

 Plymouth in the British and Irish area (Joiirn. Marine BioJ. Assoc, sei. 2, 

 v., 1897-99, p. 510). The specimens mentioned below were obtained 

 during the course of investigations carried out by the scientific staff of 

 the Department's fishery cruiser Helga. In August, 1906, in a haul at 

 6^ miles E.S.E. of Mine Head, Co. Waterford, two specimens of R. 

 aglaopheniac were taken turned round the stems ^of Aglaophenla 

 myriophylliini, L. at soundings of 29-29-J- fathoms. Another specimen, 

 coiled, but free, was taken in April, 1906, in a haul at 10 miles W. by S. 

 of Chicken Rock, Calf of Man, at soundings of 35-37 fathoms. A colony 

 of A . myriophyUiim from which it had probably become detached was 

 present in the same haul, which appears to be just outside the Irish area 

 as defined by Mr. Nichols [Proc. Roy. Irish Acad., ser. 3, vol. v., 1900, 

 p. 478). Nine specimens of M. banyulensis were taken in February, 

 1907, at 4J miles S.S.E. of Rockabill, at soundings of 20^-23 fathoms. 

 The species was twice observed at Lambay Deep. Four specimens on 

 Lafoea diimosa (Fleming) occurred in October, 1906, at soundings of 

 39-54 fathoms, and a few were taken in February, 1907, at soundings 

 of 42-46} fathoms. Two specimens attached to Hydrallmania falcata, L. 

 were taken in February, 1907, at 7-t miles E. of Bailey Lt., at soundings 

 of 24-25 fathoms. 



A number of specimens of the Cumacean Diastylis Incifera (Kroyer) 

 occurred in a haid at Lambay Deep, in May, 1904, at soundings of 32-50 

 fathoms. Dr. Caiman who has kindly identified the species, states that 

 it is rather a northerly form which does not seem to have been recorded 

 from' Irish waters. 



Anne L. Massy. 

 Dublin. 



Hyalinia Rogers! introduced at Hillsborough. 



While searching recently for " introductions " in the hot-houses at 

 Hillsborough Castle, in Down, Mr. Welch handed over to me a young 

 example of a Hyalinia which, on account of its odour, was promptly put 

 down in our list as H. alliaria. Several other specimens were afterwards 

 collected associated with Helicodisiis lijieatus Say, and a few introduced 

 species of woodlice. Upon subsequent examination at home I saw that 

 these shells were not H. alliaria, but that they belonged to the Hyalinia 

 helvetica group. The radula upon examination corresponds with that 

 given by Mr. B. B. Woodward {Journal of Conchology, vol. x. p. 311) as 

 characteristic of his species H. Rogersi, as compared with the true 

 continental H. helvetica Blum. I am not in a position to give an opinion 

 as to whether Hyalinia helvetica and H. Rogersi are distinct species or 

 only races of one species, nor is this a question which concerns Irish 

 conchologists. Suffice it to say that Mr. Woodward is convinced of the 

 distinctiveness of his species, while Mr. J. W. Taylor (Mon. L. and F. W. 

 Moll., vol. 3, p. 46), considers it to be a local race of H. helvetica. 

 Belfast. A, W. Stelfox. 



