40 ASTEROIDEA. 



7. AsTERiNA, Nai'do (= Asteriscus, Luid. ; Penfaceros, Linck). Body pentagonal, 



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

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

 No. 20. 



8. Palmipes, Linck (= Pr//y/^«.s7m>, Blainv. ; Amerojioda^^'dx^Q). Body pentagonal, 



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

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



9. CuLCiTA, Ag. (= Oreiller, Blainv.) Body discoidal, pentagonal, fissured at the angles ; 



the teguraen^ry 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 

 Hypostoma, of the author was thus subdivided : 



Sect, L — Amhulacra with four rows of feet ; dorsal toart simple. 

 Family L — AsTERiADyE, including two genera. 



1. AsTERiAS. — Skeleton netted with a single mobile spine at each anastomosis of the 



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

 Type, Asterias fflacialis, 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 crowaled series of subulate 

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



Sect. 2. — Ambulacra with two roics of feet. 



Family 2. AsTROPECTINIDiE. 



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

 tip, called paxilla?. 



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

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

 iii, t. 8, fig. 7. 



1 'Annals and Magazine of Natuval History,' vol. vi, pp. 175 and 2"."), 184). 



