Sludit's on iiiuriiii' Osti-acocls (JH'i 



alvva\-s mure numerous on the b-bristle tlian on the d-bristle. On the anterior side of the e-bri.stk' 

 there are sparse short distally pointing hairs, the distal ones of which (at the row of spines) 

 are somewhat more powerful than the proximal ones. These three bristles have no pad-like 

 formations. The a -bristle is somewhat shorter than the second joint of this antenna. All 

 the joints are quite bare. 



Second antenna: — Protopodite: In specimens whose shells were about 

 1,35 mm. long this part was about 0,7 mm. long. E x o p o d i t e: The proportion between 

 the length of this branch, and that of the protopodite is about 1 1 : 20. The proportion between 

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

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

 about 3 : 2. The first joint is very wide and flattened (cf. the accompanying fig. 4) and, as far 

 as I can see, quite bare. Endopodite: This is of the type described and reproduced by 

 G. W. MUller; see figs. 5 and 6. The a- and b-bristles have short hairs. The e-bristle is deve- 

 loped, but is very short. The g-bristle is about as long as or somewhat shorter than the proto- 

 podite. The h-, i- and j -bristles are very narrow, only about half the proximal width of the 

 f- bristle or still narrower. 



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

 has from about seven to ten teeth, the posterior one of which is rather powerful; cf. the accom- 

 panying fig. 7. The distal tooth-list is of about the same type and relative size as has been 

 described for C. oblonga above. The proximal tooth-list is rather shghtly narrower than the 

 distal one, but otherwise it varies rather considerably in type. In his diagnosis of the genus 

 Pseudoconchoecia C. Claus states (1891 a, p. 71) that ,,die distale Zahnleiste beginnt mit zwei, 

 die proximale mit nur einem Zahn". The first part of this statement is quite correct; the in- 

 correctness of the second part is best shown by the accompanying fig. 8, which shows one of 

 the many types that this tooth-list had in the specimens investigated by me. The masticatory 

 pad is not inconsiderably narrower than the tooth-lists; it is divided into four or five transverse 

 ridges, which are separated by moderately deep grooves, and is armed with fine papillae situated 

 close together. The part near the lancet-bristles and row of hairs is rather weakly pad-shaped 

 and is furnished with a number of papillae. Basale: This is relatively short, about the same 

 as in pi. XIX, fig. 10, C. Claus, 1891 a. The six teeth on the distal edge of the endite are 

 furnished with very fine serrulation. The single tooth on the outside of this process is of about 

 the type described for C- degans above. The e p i p o d i a 1 a p p e n d a g e is represented 

 by a rather short bristle. Endopodite: The first joint has four short-haired bristles on 

 the posterior side, one of which is situated somewhat laterally and is about as long as the anterior 

 side of the first and second endopodite joints; the tlu'ee others, which are situated somewhat 

 medially, are rather short, sometimes even very short. The anterior distal bristles of the second 

 joint are relatively somewhat longer than in my fig. 22 of C. symmetrica. 



Maxilla: — Endopodite: First joint: One or more of the bristles on the anterior 

 edge of this joint are furnished at the middle with rather long secondary bristles, and similar 

 bristles are also found on one of or often even on all the bristles on the posterior edge of this joint. 

 The end joint is moderately long, its ventral edge is somewhat longer than the width of this joint 



