124 Rev. A. M. Norman on the Genera and 



sand or small animals — for example, Copepod Crustacea — held 

 tight in the grasp of these pincer-formed organs. 



A remarkable variety of this species was described, from the 

 Norway coast, by Mr. Barrett, under the name of Astrogonium 

 aculeatum. It differs from the type in having the tubercular 

 spines of the aboral surface less strongly developed than usual, 

 and those of the superior lateral plates wholly absent. In these 

 respects it shows some approach towards Goniaster granulans 

 (0. F. Muller). This form has for the first time been found in 

 the British seas, during the past summer, by Messrs. Jeffreys 

 and Waller, who procured it in very deep water off Shetland. 

 Although at first sight it looks very different from the type, I 

 have intermediate forms in my collection, and am satisfied that 

 Professor Sars is right in having regarded it as a variety of the 

 present species. 



Genus XVIII. Cribrella, Agassiz. 



[Linckia, Nardo, 1834 (nom. visit.). Cribrella, Agassiz, 1837. Henricia, 

 Gray, 1841. Eehinaster, Muller & Troschel, 1842 (partly).] 



Body convex, with five very long, slender, and well-rounded 

 rays; covered in every part with tufts of short spines. No 

 marginal plates. Numerous isolated pores for the protrusion of 

 respiratory tentacles in the intervals of the tufts of spines. 

 Suckers biserial. Anus subcentral. No pedicellarise. Madre- 

 poriform tubercle, covered with spines, situated midway between 

 the centre and margin of the disk. 



Forbes spelt the name of this genus Cribella ; but Agassiz's 

 rendering of it is Cribrella — from cribrum, not from cribellum. 



Cribrella sanguinolenta (0. F. Muller). 



1776. Asterias sanguinolenta, Muller, Zool. Dan. Prod. p. 234. no. 2836. 

 1777- Asterias oculata, Pennant, Brit. Zool. vol. iv. p. 61, no. 46. pi. xxx. 



figs. 5, 6. 

 1841. Cribella oculata, Forbes, British Starfishes, p. 100. 



1841. Henricia oculata, Gray, Ann. Nat. Hist. vol. vi. p. 184. 



1842. Eehinaster oculatus, Muller & Troschel, Syst. der Aster, p. 24. 

 1842. Eehinaster Eschrichtii, Muller & Troschel, Syst. der Asteriden, p. 25 



(fide Sars). 

 1844. Eehinaster Sarsii, Muller & Troschel, Archiv fur Naturgeschichte, 



vol. x. p. 179 (fide Sars). 

 1853. Linckia oculata et/)er£wsa, Stimpson, Invertebrata of Grand Manan, 



p. 14. 

 1857. Cribrella sanguinolenta, Liitken, Oversigt over Gronlands Echino- 



dermata, p. 31. 



Cribrella sanguinolenta occurs all round the coasts of Great 

 Britain and Ireland, and in all depths of water from between tide- 

 marks down to 100 fathoms. It is a very variable species ; and 

 more than one of its forms we have at times been inclined almost 



