40 



ASTEROIDEA. 



7. AsTERiNA, Nardo (= Asteriscus, Luid. ; Pentaceros, Linck). Body pentagonal, 



covered with pectinated scales, upper surface convex and inflated, under surface 

 with deep, narrow, ambulacral areas. Type, A. mimifa, Blainv., Linck, tab. iii, 

 No. 20. 



8. Palmipes, Linck (= P^/'/z/^a^/me, Blainv. ; Auserojjoch, 'Navdo). Body pentagonal, 

 much depressed, thin and membranous at the border. Type, A. memhranacea, 

 Retz., Linck, tab. i, fig. 2. 



9. CuLciTA, Ag. (= Oreil/er, Blainv.) Body discoidal, pentagonal, fissured at the angles ; 



the tegumentary membrane covered with granules. Type, A. discoidea, Lamk. ; 

 Encycl. Method., PI. xcvii — xcix. 



Dr. J. E. Gray published^ a synopsis of the genera and species of Star-fishes in the 

 collection of the British Museum and Zoological Society. The order Asteroidea, or class 

 riYrosTOMA, of the author was thus subdivided : 



Sect. L — Ainhulacra toithfour rows of feet ; dorsal ivart simple. 



Famili/ L — Asteriad.e, including two genera. 



L Asterias.- — Skeleton netted w4th a single mobile spine at each anastomosis of the 

 ossicula ; body covered with more or less prominent, elongated, mobile spines. 

 Type, Asterias glacialis, Linck, Stel. Mar. t. 38*39. 



2. Tonia, Gr. — Skeleton netted with a series of crowded, small, blunt, mobile spines on 

 the sides of each ossiculum ; ambulacra bordered with a crowded series of subulate 

 spines, and without any triangular pierced pieces within. Tonia Atkmtica, Gr. 



Sect. 2. — Anihulacra with tioo roios of feet. 



Parailjj 2. — Astrgpectinid^e. 



Back flatfish, netted with numerous tubercles, crowned with radiating spines at the 

 tip, called paxillas. 



1 . Natjricia, Gr. — Ambulacral spines broad and ciliated ; two series of tesserae between 

 the angles of the arms and the mouth beneath. Asiatic. N. ^yulchella, Gr., Seba. 

 iii, t. 8, fig. 7. 



^ ' Annals and Magazine of NaUiral History,' vol. vi, pp. 175 and 2/.^, 1841. 



