with descriptions of some new species of Invertehrata. 321 



Planaria rosea, Miill. Zool. Dan. vol. ii. p. 31. tab. 64. figs. 1, 2. 



At the same time with Planaria cornuta two specimens of P. rosea 

 were taken. T'his species has not yet a place in the British fauna, 

 but it was obtained on the coast of Anglesea last autumn by- 

 Mr. M'Andrew and Professor Edward Forbes when dredging there. 

 Miiller's specimens were from the coast of Norway. 



ECHINODERMATA. 



Holothuria [Cucumarid] inhcerens, Mull. Zool. Dan. vol. i. p. 35. 

 tab.31. f.l— 7. 



An example of this species, about three inches in length, or as 

 represented in the ' Zoologia Danica,' was found by Mrs. W. J. Han- 

 cock, cast on the beach at Balbriggan (county Dublin) after a storm 

 in March 1843. This has not been noticed as a British species. 



fChirodota digitata, Mont. (sp.). Holothuria digitata, Mont. 



Linn. Trans, vol. xi. p. 22. pi. 4. f. 6 ; Forbes^s Brit. Echino- 



dermata^ p. 239. 



On the 18th of December 1843, an individual of this species, 

 which had hitherto been obtained only by Montagu in Devonshire, 

 was found lying on the sand between tide-marks near Carrickfergus 

 Castle during a search for natural-history objects by Mr. Hyndman 

 and myself. 



ACALEPHA. 



t Velella subemarginata, Thompson. 



Membranous base oblong, slightly cut round the edge, in length 

 2 inches 10 lines, breadth 1 inch 7^ lines ; crest almost crescentic in 

 form or obscurely pointed at highest part, thick in substance, with a 

 minute vein-like ramification appearing throughout : body proper or 

 skeleton, of a narrow oblong form, rounded at ends, in length 2 

 inches 4 lines, breadth 10 lines. 



Colour when recent according to Professor AUman : " Disc, mar- 

 gin and tentacula fine sky-blue ; sail light blue, nearly transparent, 

 margined with delicate violet. Skeleton colourless and transparent." 



This species differs from the ordinary Velella of the Irish coast in 

 its greatly superior size, in the margin of the membranous base being 

 slightly emarginate, in the crest being of a much stronger consist- 

 ence and of a more rounded outline. 



The specimen here described was given to me by Professor All- 

 man, who saw great abundance of them on the shore of Courtma- 

 sherry harbour (county Cork) after a south-westerly gale late in the 

 autumn of 1838 or 1839, but preserved only one. 



This description of ^Velella from spirits must necessarily be unsatis- 

 factory, but it seems to me better that a species should, under such 

 circumstances, be noticed than passed over altogether — named it 

 perhaps should not be, but this has already been done in my Report 

 on the Invertehrata of Ireland : the specific name there is given er- 

 roneously marginata. 



