ASTROPECTEN. 



125 



ambiilacral bones, with their combs of spatulate spines, afford additional evidence that these 

 two Star-fishes appertain to distinct species. 



Locality and Btratigrapliical Position. — This Star- fish which belongs to the British 

 Museum, was collected from the Forest Marble near Malraesbury, by Mr, William Buy, 

 where it was associated with numerous Mollusca, Echinidse, and Crinoidae, appertaining to 

 that formation. 



I dedicate this species to my friend Professor Huxley, P.Pt.S., whose numerous 

 contributions to palseontology and zoology have advanced the progress of these branches 

 of natural science. 



E. — Sjjecies from the Kelloway Mock. 



AsTROPECTEN CLAVtEFORMIS, Wnfjld. PI. XI. 



AsTERiAS AiiENicoLA, Churlesivorttc. London Geol. Journ., tab. 17, 1847. 

 AsTKOPECTEN AiiENicoLUS, Forbes. Mem. of tlie Geol. Surv., vol. ii, part 2, p. 477, 1848. 



— — Forbes. In Morris's Catalogue of British FossiLs, 2n(l ed., 



p. 72, 1854. 



— CLAV.'EFORMis, Wright. Mongr. of Oolitic Echinoderms, Pal. Soc, p. 428, 



18G0. 



Bays five, convex, contracted at the base, enlarged at the inner third by the l)readth 

 of the marginal ossicula, and tapering gently throughout the two outer thirds of their 

 length ; disc small, its proportionate diameter to the body as 2 to 9 ; intermediate angles 

 acute, and much contracted by the bulging of the rays; marginal plates variable in 

 width, transversely elongated, and in general exceeding one third of the ray. Anibu- 

 lacral furrows straight and linear, not participating in the enlargement of the margin, 

 which is entirely owing to the fonu and development of the border plates. 



Biweiidons.' — Diameter of the disc from one an^le to another, one inch and cioiht 

 tenths ; diameter of the body, nine inches ; width of a ray near the angle, one inch ; 

 width of a ray at the wiclest part of its enlargement, one inch and one fifth ; from its 

 maximum width to its worm-like point it gradually tapers. 



Description. — This Star-fish was first figured in the 3rd part, pi. 17, of the 'London 

 Geological Journal,' by Mr. Cliarlesworth, under the name of Asterias arenicola, Goldf., 

 from the belief that it was identical with that species; in this opinion Professor Forbes^ 

 concurred, for we find in his memoir on ' British Fossil Asteriadse ' the following diagnosis 

 of this form under the name Astropecten arenicoliis, Goldfuss : 



1 Memoirs of the ' Geological Survey,' vol. ii, part 2, p. 477. 



