292 Messrs. Alder and Hancock on some new and rare 



for the present to the decision of other umpires, only premising, 

 that should our suspicions prove correct, the genus Limapontia 

 of Johnston will take precedence of the Pelt a of Quatrefages. 



2. Descriptions of some new species of Nudibranchiata. 



Nearly the whole of the species here described were obtained 

 on an excursion to the Isle of Arran in May and June last. 

 Among them is a second species of our new genus Eumenis, 

 which, having been founded on a single individual, may by some 

 have been considered to be imperfectly established. It is satis- 

 factory therefore to have obtained another species, sufficiently 

 distinct from that found in Torbay last year, yet at the same 

 time confirming the characters we had previously given to the 

 genus. Unfortunately in this instance again we only procured 

 a single specimen. 



Besides the Nudibranchs described below, we met with some 

 other rare species, particularly the JEgires punctilucens, hitherto 

 only claiming a place in the British fauna from a specimen 

 found on the south coast of Ireland by Professor Allman. Seve- 

 ral specimens of this curious and beautiful mollusk were found 

 among the rocks at Ardrossan on the Ayrshire coast, and on the 

 shores of the Isle of Arran. It would thus appear to be diffused 

 over the estuary of the Clyde, and this circumstance, together 

 with some occasional variation in its colour, induces us to think 

 that the Doris Maura, found by Professor E. Porbes on Devar 

 Island, near Campbeltown, will prove to be a variety of this 

 species. One of the most plentiful species of Eolis on the west- 

 ern coast of Scotland is the E. Drummondi of Mr. Thompson, 

 first discovered by Dr. Drummond in Belfast Lough. Eolis alba, 

 hitherto considered a rare species, was not uncommon in the same 

 localities. Some curious varieties occurred, especially one with 

 the branchial papillae of a brown colour and a few brown mark- 

 ings on the body, which, had we not found intermediate varie- 

 ties, might almost have induced us to think it distinct. Some 

 fine specimens of Goniodoris castanea, not the least interesting 

 of our recent acquisitions, were procured at Saltcoats by Mr. 

 David Landsborough, jun., to whose kind assistance we are also 

 indebted for two of the new species of Eolis described below. 

 Two specimens of Doris fiammea and several of D. Johnstoni 

 were found in Lamlash Bay. 



Doris planata. — Body elliptical, much-depressed. Cloak ex- 

 tending much beyond the foot, thickly covered with obtuse warty 

 tubercles, mostly minute, but of very unequal sizes, the largest 

 ones being arranged at irregular intervals along each side of the 

 back. Colour reddish brown, interspersed with dull lemon- 

 yellow and purple-brown ; the whole sprinkled with minute dark 

 brown spots. A few irregular patches of dull yellow run down 



