438 



MR. W. P. SLADEIT ON" THE ASTEEOIDEA 



Temnopleuetjs TOREUMATicrs (Klein), A^assiz(?) (juv.). 

 PL VIII. figs. 10, 11, 12, 18. 



1734. Cidaris toreumatica, Klein, Nat. Dispos. Echin. p. 64. 



1788. Echinus toreumaticus, Gmelin, Linn. Syst. Nat. 3180. 



1816. Echinus sculptus, Lamarck, Ann. sans Vert. p. 47. 



1841. Temnopleums toreumaticus, Agassiz, Monog. Scutelles, p. 7; et 



in Valentin, Anat. du gen. Echin. p. vii. 

 1846. Temnopleums bothryoides, Agassiz, Cat. Rais., Ann, Sc. Nat. vi. 

 p. 360 (pars). 



1863. Temnopleums Reevesii, Agassiz, Bull. Mus. Comp. Zool. Harvard, 



i. p. 23 non (Gray). 

 1872. Temnopleums toreumaticus, A. Agassiz, Revision of Echini, 



p. 166. 



Coll. St. John : lat. 34° 8' N., long. 126° 24' E., Korea, 24 

 fathoms. 



A small specimen measuring 9*5 millims. in diameter, which 

 differs entirely from the preceding young Temnopleuri, I refer, 

 although not without hesitation, to the above species. The test 

 is stout ; and the primary tubercles are large and very prominent, 

 with the sutural pits extensive and sharply defined. The well- 

 developed secondaries and miliaries which fill the plates, form 

 oblique lines thereon, continuous with similar lines on the com- 

 panion plate, the miliaries of the upper portion of one plate 

 following the same trend as the lower and principal range of tu- 

 bercles on the accompanying plate. This feature, combined with 

 the band-like character of the portion of the interambulacral plates 

 which lies between the sutural cavities, is very suggestive of the 

 arrangement in TemnecJiinus. The genital plates are compara- 

 tively large ; and the anal area is surrounded by a prominent and 

 close ring of robust secondary tubercles. Compared with young 

 T. RardwicTcii, the Echinoid under notice is readily distinguished 

 from specimens of similar or even greater size by the prominent 

 character of the tuber culation and the regularity of the special 

 arraugement which this displays. 



If the view be correct that the present premature specimen is 

 the young of T. toreMmaticiis, the characters which it presents are 

 such as point to an intere sting phylogenetic connexion of Temno- 

 pleums with TemnecJiinus ; whilst it much more nearly resembles 

 the fossil forms of that genus than the seemingly aberrant species 

 TemnecJiinus macuhtus, A. Agassiz. 



