The Ceinoids from De. S. Bock's Expedition to Japan 1914. W'A 



The L of the distal p-s with some irregularities follows the L 

 of the arms; neAertheless it shows great variability in specimens with 

 an arm-length of 70 — 90 mm. 



A. H. Clark lias distinguished the two species Ä. anthns and A. 

 acerha by the following characteristics: 



A. anthns A. acerha 



A) Distal pinnules 9 mm. a) distal pinnules 13 mm. 



1^) The outer segments of distal b) the outer segments of dist. p-s 



p-s: L = 2 X br. Lè3 X br. 



C) The Br dorsal spines long and c) the Br dorsal spines blunt, short, 

 strongly curved not much curved. 



D) R — s with a rounded tubercle " d) R — s with a dorso-ventrally 



elongated tubercle. 



E) I Br-s without median carina- e) I Br-s with a faint, low median 

 tion carination. 



(F) Arms moi-e than X. f) Arms X). 



Some examples from the above-described specimens may be quoted 

 and may be denoted as follows: 



Sp. 1 A(a) Be D E F " Sp. 14 a b C D E f 

 Sp. 9 Aa Bb C d E F Sp. 15 Aa b C d E F 



Sp. 24 A(a) B c d e (F) f Sp. 34 (A)a Bb Cc d e F 



Sp. 12 a (BjbCDEf Sp. 20 a bCdEf 



From the above cited examples it seems evident to me that the 

 characteristics of A. anthus and acerha are irregularly mixed in the 

 different specimens. Clark lays special stress upon the fact that the 

 L of the distal pinnules and pinnulars and the blunt spines on the 

 distal Br-s are characteristic of acerha. This combination scarcely 

 ever occurs in the above-described specimens, but often long p-s to- 

 gether with strongly developed Br-spines. 



From what is stated above — the examples could be multiplied — 

 it seems to me to be clear that A. anthus and acerha ought to be refer- 

 red to the same species. 



A. lepida is a third species of the genus Asterometra that A. H. 

 Clark has described. It is a form differing from the two previously 

 mentioned species (which have a large cylindrical Cd with a conical end) 

 by a small and conical Cd. It is farther mentioned that the cirrus-sockets 



Nova Acta Keg. Soc. Sc. Ups.. Ser. 4, Vol. 5. N:o 0. Impr. '=,3 1922. 15 



