studies oil marine Ostracods 571 



type (cf. the special terminology below), the posterior one is almost always more or less 

 dagger-shaped, only in exceptional cases of the tube-bristle type. On the outside of this endite, 

 somewhat proximally of nos. 1 — 3 of the teeth on the distal edge (counting from front to back) 

 there is a solitary more or less well developed tooth. On the inside of this joint, somewhat 

 proximally of the middle and about half way up the joint there is a powerfully chitinized, 

 in most cases broadly triangular edge, against which the coxale rests. The number and positions 

 of the bristles on this, as on the following joints, are subject to rather slight variation. The 

 following number and positions were found on the basale on the species investigated by me. On 

 the endite there were always four bristles; one of these was situated on the anterior edge of 

 the process, about half way up the process or in most cases somewhat distally of this point, 

 the three others on the outside of the process. In addition there was in most cases on the 

 inside, near the distal boundary of this joint, a solitary bristle. The e p i p o d i a 1 

 appendage is, if it is developed, always small, veriuciform, furnished with a single 

 bristle and situated on the above-mentioned broadly triangular edge on the inside of the basale, 

 against which the coxale rests. The e x o p o d i t e has always one bristle (in most cases 

 plumous). Endopodite: The proportion between the joints, which seems to be subject 

 to rather slight variation, is shown by the following figures (taken from measurements of 

 Coiichoecia symmetrica G. W. Mulleh, ^): 



I :II : III --about t =! : o- 

 Thus the second joint is relatively short, compared with this joint in the sub-order 

 Cypridiniformes, the end joint, on the other hand, is comparatively large. The first joint is 

 somewhat narrower proximally than it is distally, the end joint is often only rather slightly 

 narrower than the first and second joints. The first joint has a single bristle antero-distally 

 and a somewhat varying number of bristles posteriorly (from one to four were observed on the 

 speciesof this sub-family that were investigated by me). The second joint has always three bristles 

 antero-distaUy and two or one, in most cases two, only exceptionally (Euconchoecia) one, poster- 

 iorly. The end joint is always furnished with seven* distal bristles. All the bristles on the 

 basale (except the two short processes behind the teeth of the distal edge on the endite) and the 

 endopodite are of the ordinary type, not tube-bristles. On the inside of the end joint there 

 emerges a more or less powerful gland. The exit of this gland is siurounded by numerous rather 

 short and exceedingly fine hairs. Pilosity: On the basale there are a number, in most cases 

 three or four, of transverse rows of rather short, stifi hairs posteriorly on the endite. 



Maxilla: — This has no dimorphism or at any rate it is only scarcely perceptible. — 

 P r o t o p o d i t e: The species of this sub-family investigated by me had the following numbers 

 of bristles on the endites: The endite on the procoxale had from six to ten distal bristles, the 

 endite on the coxale had from twelve to sixteen distal bristles. These bristles are subject to 

 rather slight variation; about the same types are found at the corresponding places in all species; 

 there is great constancy within the species. One or a few of the bristles on the endite of the pro- 

 coxale are furnished with long, stiff secondary bristles; on the other hand there seem to be 



* It may perliaps be of a ccilaiii iiiU'i-cst to ol).siifVf llial tlw imkI juiiit uf lliis li'iili in tlii' ramily Cypridinidai- i 

 characterized by the same iuinil)er. 



