THE ANNALS 



AND 



# 



MAGAZINE OF NATURAL HISTORY, 



** per litora spargite museum. 



Naiades, et circfkm vitreos considite fontes : 

 Pollice virgineo teneros hlc carpite flores : 

 Floribus et pictum, divae, replete canistrum. 

 At vos, o Nymphae Craterides, ite sub undas ; 

 Ite, recurvato variata eorallia trunco 

 Vellite muscosis e rupibus, et mihi conchas 

 Ferte, Dese pelagi, et pingui conchylia succo." 



Parthenii Eel. 1. 



No. 109. JANUARY 1846. 



I. — Note on a new Genus of Nudibranchiate Mollusca. By Geo. I 

 J. Allman, M.B. &c., Professor of Botany in the University 

 of Dublin, 



In the autumn of 1842 I obtained in a salt-marsh about three 

 miles to the west of Skibbereen, county Cork, a small Eolidiform 

 Nudibranch, which on examination appeared to possess cha- 

 racters entitling it to the construction of a new genus for its re- 

 ception. 



It existed in great numbers in the salt-marsh, which was never, 

 except at the very highest spring tides, flooded by the sea. The 

 day was bright and warm when I met with this curious little ani- 

 mal. Many had crept quite out of the water and were crawling 

 over the moist fronds of Enteromorpha intestinalis, and seemed 

 to delight in exposing their slimy bodies to the influence of the 

 warm autumnal sun. Others swarmed on the mud in the little 

 shallow pools of the marsh, where their ova were abundantly de- 

 posited in the usual gelatinous masses characteristic of the eggs 

 of the Nudibranchiate Gasteropods, a fact which is of itself suffi- 

 cient to prove that this strange semi-marine and even semi-aqueous 

 habitat was quite natural to our little Nudibranch. Their bodies ^ 

 were enveloped in an exceedingly, abundant mucous secretion, 

 which was poured out more copiously than I recollect to have 

 witnessed in almost any other Gasteropod, and which is perhaps 



Ann. §• ik%. N. Hist, Vol. xvii. B 







