Ophiiira rosula. 231 



shell nor animal has any affinity with Bulla. The generic name 

 of Sigaretus was first proposed by Adanson ; but the shell 

 which he figures and describes as its type is, properly speaking, 

 external and operculate; and, with such a structure, it alienates 

 itself entirely from the shell before us. Ours, as it seems to 

 me, certainly belongs to the genus Sigaretus of Cuvier, Reg. 

 Anim., iii. 90., which, I need scarcely remark, is not the same 

 as the Sigaretus of Adanson, and, therefore, cannot retain its 

 present designation. From the evidence of Mr. Gray, we 

 know that it, in fact, is synonymous with the more recently 

 instituted genus Coriocella of Blainville, Manuel de Malaco- 

 logie, p. 466. ; and if the Coriocella has an internal shell, 

 which Blainville denies, our Lamellaria tentaculata may find 

 a resting-place in it. 



Ophiu^ra ro'sula. (jig.26.) 



O. rdsula. Body spinigerous and roughened dorsally with 

 short processes ; at the base of each ray a large heart-shaped 

 smooth space formed by the union of two scales. 



Synonymes. — O. rosula Fleming, Brit. Anim., 489.; Borl. Cornw., 259. tab. 

 xxv. fig. 19-24. ^sterias pentaphylla, varia, aculeata, hastata, fissa, 

 nigra, Penn., Brit. Zool., iv. 131-133.; Turt. Brit. Faun., 141. 



Hab. — Very common on all the British coast. 



Desc. — Body circular or pentagonal, flattened or convex, 

 variously marked and coloured, covered with deciduous spines 

 and roughened with short obtuse processes arranged into five 

 avenues radiating from the centre, and divided by the large 

 heart-shaped scales placed above the base of the rays ; scales 



s 4 



