studies On marine Oslracods G97 



Conclioecia spinirostris C. Claus. 



Conchotcia spinirostriis (part.), C. Clals, 1874 a, p. 177. 



„ 1874b, p. 6: pi. I. fig. 8; pi. II, tig. 11. 

 fellucidcL G. 0. Sars, 1887, p. 80; pi. XI, figs. 1 — 1: pi. XII; pi. XIII, 



figs. 1—4. 

 ,, spinirvstris. C. Cl.Al s, 1891), p. 7. 



1891a, p. 56; pi. I; figs. 1—12. 

 G. W. MOLLEK, 1894, p. 227; pi. «, figs. 1—9, 13; pi. 37, figs. 10. 11. 

 ,, G. S. BRADY and A. M. Norman, 1896, p. 689; pi. LX, fig. 22. 



G. S. Brady, 1902 a, p. 190. 

 Ch. Juday, 1906, p. 18; pi. Ill, fig.s. 4—7. 

 (part.), G. H. Fowler, 1909, p. 252; pi. XXIV and XX\'. 



Description: — See C. CLAUS, 1891 a, p. 56 and G. W. Mll!,er, 1894, p. 227. 



Supplementary description: — Male: — 



Shell: — Length: The specimens investigated by me measured 0,9 — 1,05 mm.; 

 cf. p. 704 below. Length : height about 2:1; length : breadth about 2,25 : 1. S e e n f r o m 

 the side it is of about the type reproduced in the accompanying fig. 1, i. e. it agrees very 

 well with the figures given by C. Claus and G. W. Muller. Seen from below (fig. 2) 

 it has its greatest width at about the middle and has evenly curved side contours; it is broadly 

 rounded anteriorly, with an almost symmetrical rostrum, and somewhat pointed posteriorly. 

 The shoulder vaidt is rather well developed and always well rounded. The surface of the 

 shell has a few scattered rather long, soft hairs, especially on or near the rostrum. Seen 

 from inside: Selvage: On the rostrum this is more or less finely and iiregularly serrate- 

 edged or almo.st smooth; it is about as wide as in pi. 37, fig. 10, G. W. MCller, 1894 

 (consequently rather considerably wider than in pi. I, fig. 2, C. Claus, 1891 a) and has no large 

 spine-like process. Along the anterior margin of the shell and the anterior part of the ventral 

 margin it is quite smooth-edged or exceedingly finely serrulated; along the posterior half of the 

 ventral margin of the shell and for a short distance along the most ventral part of the posterior 

 margin it is finely serrulated; inside the remaining part of the ventral half of the posterior margin 

 of the shell the marginal spines of the selvage are somewhat larger than the more ventral ones. 

 The unsymmetrical glands have their exits at the usual place. There are no lateral corner 

 glands. On the anterior margin, just ventrally of the rostrum, I have not found „dicht neben- 

 einander zwei je nach Erhaltung und physiologischem Zustand mehr oder weniger auftallige 

 Drusen"; cf. G. W. MUller, 1906 a, p. 99. The medial glands along the posterior margin of 

 the shell are of about the same type as is described for C. ohlonga on p. 618 above. I did not 

 succeed in discovering as deep a junction between the lamellae of the shell inside the rostral 



incisur as in pi. 37, fig. 10, G. W. MCller, 1894; on the other hand I was able to find 



ss 



Zoolog. bidrng, Urpaala. Suppl-Btl. I. 



