160 The Irish Naturalist* April, 



ZOOLOGY. 



Some further additions to the Marine Mollusca of Co. Dublin. 



In continuation of a systematic survey of the marine molluscau fauna 

 of the Dublin coast which has occupied me for the past two years, I 

 made some dredgings in and around the classic and much-worked area 

 of Dalkey Sound in September and October last. The highly productive 

 labours of Walpole in 1852-53, and of Kiuahan in 1860, have by no means 

 exhausted this ground, as three half days spent in dredging outside the 

 northern end of the Sound towards Bullock Harbour, and about a mile 

 eastward of the Sound on the seaward side of the isolated rock known as 

 the Muglins, yielded me no less than four species new to the coast of Co. 

 Dublin. One fortunate haul made outside the Muglins in 13 fathoms 

 low-water gave me the richest shell sand I have ever obtained on the 

 Dublin coast whether by dredging or shore collecting, the material 

 brought up having produced 89 species of mollusca. Many of these are, 

 or have hitherto been considered to be. rare for Dublin, and perhaps in 

 some future issue of this Journal the editors may be able to spare me a 

 page for a complete list of the species, as an example of the happy 

 chances which occasionally befall the earnest dredger. One of the 89, 

 Utriculus mammilatus (Phillipi), of which three specimens were found, has 

 not previously been recorded for Dublin or for East Ireland. 



Two other dredgings, made off Bullock Harbour, each in 10 fathoms 

 low-water, yielded me three Nudibranchs new to Dublin, and to East 

 Ireland. The first of these, made on the 20th September last, gave me 

 one specimen of Antiopa cristaia (Delia Chiaje). It was a damaged or 

 immature specimen which, although destitute of most of its body 

 papillae, I was able to identify positively with the valuable assistance of 

 Mr. A. R. Nichols and Alder and Hancock's Monograph. The second 

 dredging, made on the 6th October last yielded three specimens of 

 Antiopa hyalina t Aid. and Hanc. The only previous Irish records for these 

 species are for South -west Ireland. The first species has been taken in 

 Cork Harbour, Baltimore Harbour, and Valencia Harborr, and the second 

 in Valencia Harbour. Along with A. hyalina in this last haul of the 6th 

 October a fine specimen if inches long of Lomanotus marmoratus (Aid. and 

 Hanc.) was taken. This was previously known as Irish from but two 

 stations, Valencia Harbour in Kerry, and Ballinakill Harbour in Galway, 

 and is perhaps the most interesting result of my two years work on the 

 Dublin marine mollusca. From the rarity of its forms, the genus 

 Lomanotus is not well understood, and the species stand in need of re- 

 vision. Such a revision I have ventured to undertake after a study of 

 the scattered and not easily accessible literature of the genus, and hope 

 before long to publish the results, with a detailed description of the 

 Bullock specimen, and reasons for the adoption for it of Alder and 

 Hancock's specific name here used. 



N. CouiAN. 



Sandycove. 



