studies on niarino Ostracods ()(i9 



way between the selvage and the margin of the shell or in most cases somewhat nearer the latter 

 and (at least in the case of some of them) joined by a fine undulating line in about the way 

 shown in my fig. 5 of C. symmetrica. Within the ventral part of the posterior margin of the shell, 

 just dorsally of the left unsymmetrical gland, a number of these glandular exits are joined in 

 about three groups; each of these groups of glands comprises from two to four glandular exits. 

 These three groups are situated in line with the other glandular exits or often somewhat inside 

 them. There is no distinctly developed hinge-socket or hinge-tooth at the posterior dorsal 

 corner of the shell. 



First antenna (fig. 3) : — This is of the type described and reproduced by 

 G. W. MUllkr. The a-bristle is in most cases about as long as the second joint of this 

 antenna. The pad of the b-bristle is of the same type and relative length as in C. bispinosa; 

 see my fig. 3 of this species. The e-bristle has about 43 — 47 spines in each row; the distal 

 1.5 — 20 of these spines are situated in pairs, the others alternate more or less regularlv; their 

 shape seems to be the same as is reproduced by G. W. Mullek, pi. XVIII, fig. 7, 1906 a; there 

 are no spines or bristles distally of these rows of spines. The anterior side of this bristle 

 is almost quite bare; only one or a few short secondary bristles can be observed. All the joints 

 are quite bare. 



Second antenna: — P r o t o p o d i t e: In specimens with shells 2,4 mm. long 

 this measured about 1,2 mm. Exopodite: The proportion between the length of this 

 branch and that of the protopodite is about 10 : 18 or 1 : 2. The proportion between the length 

 of the first joint and the total length of the eight following joints is about 10 : 4 or 10 : 5. The 

 proportion between the length of the longest natatory bristles and that of this branch is about 

 3 : 2. The first joint is furnished with spines proximo-dorsally, but these are fewer than in 

 C. symmetrica (cf . my fig. 12 of this species). E n d o p o d i t e : This is of the type described 

 and reproduced by G. W. Muller. First joint: The processus mammillaris has a distal 

 peg-like process. Third joint: The clasping organ on the right endopodite is in most 

 cases not c^uite so strongly bent as in G. W. Muller's pi. XYIII, fig. 10, 1906 a; 

 cf. the accompanying fig. 4; this character varies, however, to some extent. The shaft 

 of the h-bristle is usually furnished with short, fine spines; those of the i- and j -bristles are 

 usually smooth. 



Mandible: — Protopodite: Coxale : The toothed edge of the pars incisiva 

 has about ten teeth. The distal tooth-list is of aboiit the same relative size and type as has 

 been described above for C. oblonga, though the number of teeth is on the average somewhat, 

 though only slightly, greater than in the species mentioned. The proximal tooth-list is slightly 

 narrower than the distal one, its teeth are rather irregular, often resembling more or less the type 

 reproduced in my fig. 18 of C. symmetrica; on the inside it is furnished with small papillae situated 

 close together. The masticatory pad is rather considerably narrower than the tooth-lists, about 

 the same as in my fig. 15 of C. symmetrica, in most cases rather indistinctly divided into four or 

 five transverse ridges and furnished with close small papillae. There is a low tooth just proximally 

 of the masticatory pad. Basale: The six teeth on the distal edge of the endite have exceedingly 

 fine serrulation. The single tooth on the outside of this endite is of about tlie same type and 



