On a new Sea-star from Hong Kong. 415 



Width of neck of ischium 125 



Approximate antero-posterior length of the obturator 



foramen 168 



Leno^th of ilium 302 



Width of upper end of ilium 145 



„ acetabular end of ilium 127 



Femur : 



Lenj^th 678 



Width of upper end 146 



„ lower end (approi.) 278 



„ middle of shaft , 127 



EXPLANATION OF THE PLATES. 

 Plate VII. 



Saci'al region of vertebral column of Rhomalensaurus thorntoni, sp. n., 

 from below. About j nat. size. 



Plate VIII. 



Shoulder-girdle of Rho7naleosaurus thorntoni, sp. n., 

 from below. About ^ nat size. 



Plate IX. 



Pelvic girdle of RhoinaJeosaurus thorntoni, pp. n., 

 from above. About 4- nat. size. 



XLVr. — A new Sea-star from Hong Kong. By W. K. 

 Fisher, Hopkins Marine Station, Pacific Grove, Cali- 

 fornia. 



[Plate X.] 



Among a number of echinoderms received from Professor 

 Arthur S. Campbell, Canton Christian College, Canton, is a 

 new Asterina collected on the seaward side of Hong Kong 

 Island. 



Asterina orthodon^ sp. n. 



Diagnosis. — In general appearance closely resembling 

 Asterina nuda, H. L. Clark *, but differing in having the 

 ])late3 of the papular areas provided with numerous delicate 

 spiculiform spiiielets on the concave adcentral margin ; and 

 in the oral armature, which consists of ten to twelve slender, 

 uniform, terete, opaque, blunt marginal spinelets, united by an 



* ' The Echinoderms of Torres Strait,' Carnegie Institution of 

 Washington, Publication No. 214, 1921, p. 98, pi. xxiii. tigs. 3 and 4. 



