studies on marine Oslracods 585 



Halocypris cuncha -\- H. felagica, G. S. BRADY and A. M. NORMAX, 1896, pp. 702, 703; 



pi. LXII, figs. 14—19. 

 ,. „ „ G. S. Brady, 1897, p. 77. 

 concha, A. ScOTT, 1905, p. 370. 

 felagica, P. T. Cleve, 1905, p. 131. 

 inflata, G. W. MULLER, 1906 a, p. 50; pi. VII, figs. 19—28. 



„ „ „ 1906 b, p. 2. 



concha + H. fdagica, V. VA\ RA, 1906, pp. 63 and 64. 



„ ,, „ Cii. JUDAY, 1906, p. 27; pi. VII, figs. 4—7. 



inflata, G. \\. Muller, 1908, p. 65. 



+ H. filobom, Til. Scott, 1912 a, p. 587; pi. XIII, figs. 29—32. 

 „ „ G. W. MuLLER, 1912, p. 58. 



Description: — See C. ClaUS, 1891a, pp. 77, 78 and G. \V. Muller, 1906 a, p. 50. 



Supplementary description: — Male: — 



Shell: — The length varies, according to G. W. MULLER, 1906 a, between 1,15 and 

 1,75 mm. Of the mature males investigated by me 29 (from ten dift'erent stations) had shells 

 from 1,4 — 1,6 mm. long; thus in these specimens this character was subject to rather slight 

 variation; one specimen, from S. A. E. station 116, only attained, however, a length of 0,95 mm.; 

 with regard to the latter specimen see p. 598 below. Length : height about 1,45 : 1; length: 

 breadth, about 1,65 :1. Seen from the side (see the accompanying fig. 1), it has gener- 

 ally the same type as observed by G. W. MiJLi.i'Jl^; cf. this writer, 1906 a, pi. VII, fig. 20. The 

 little male from station 116 was, as is shown in fig. 2, of a somewhat different type. Transitional 

 forms between these types were found. S e e n f r o m b e n e a t h the shell is very broad 

 and lentil-shaped, with its greatest breadth somewhat in front of the middle; the side contours 

 are well and uniformly rounded and the rather well rounded anterior and posterior ends are 

 of about the same size. Seen from behind (fig. 5, cJ — ?) it is somewhat heart-shaped, 

 as the dorsal margin is slightly concave. The sculpture of the surface of the shell 

 is as described by G. W. MtiLLlCR; ratlier sparse short hairs were observed on the surface of the 

 shell. Seen from inside: The hinge was of about the same type as is reproduced in 

 pi. XXII, figs. 1, 2 and 3, C. Claus, 1891 a. The selvage is rather broad along the anterior 

 and ventral margins of the shell (ventrally of the incisur and along the anterior and middle 

 part of the ventral margin of the shell the selvage is so broad that when the shell is pressed 

 beneath the coverglass, it extends somewhat beyond the margin of the shell), it becomes more 

 and more narrow posteriorly until it ceases altogether at about the boundary between the ventral 

 and posterior margins of the shell or somewhat more dorsally, sometimes it continues up along 

 the posterior margin of the shell to about half the lieight of the shell. On the anterior half of 

 the shell — and on the rostrum too — the selvage has a smooth edge; from a point at or .somewhat 

 behind the middle of the shell it is finely and fairly uniformly serrated (see fig. 6). The selvage 

 is finely cross-striated along the greater part of its length. Along the free margin of the shell, 

 about half way between the selvage and the margin of the shell, there are the openings of a large 



Zoolog. bidrii'^, Upps:il;i. Supp'.-It<I I. ' * 



