studies oil marine Oslracods '47 



boundary of the first endopodite joint. E n d o p o d i t o (fig. 2(5): The first joint has along its 

 anterior edge a sparse row of five long bristles, differing somewhat in length, the longest being 

 somewhat longer than this joint, the shortest about as long as the width of this joint; they all 

 have short, fine hairs, almost bare; the distal one is in most cases of the tube-bristle tj^e, the 

 others are pointed. On the posterior edge of this joint there are three bristles, situated at some 

 distance from each other somewhat distally of the middle of this joint; they are of somewhat 

 different lengths, the longest being about as long as the width of this joint, the shortest somewhat 

 more than half of this length; they all have short, fine hairs, almost bare; they are either all well 

 pointed or one or two of them are of the tube-bristle type. The inner bristle on this joint is 

 very much displaced posteriorly, and is situated close to the three posterior bristles; it is about 

 as long as the shortest of the three just mentioned and has short, fine hairs; it is usually of the 

 tube-bristle type. The end joint is comparatively short and thick, only about as long as half 

 the middle breadth of the first endopodite joint. It is provided with six distal bristles; this is 

 noteworthy, as the other species of this sub-family that are dealt with in this work have only five 

 bristles on this joint. Of these bristles the anterior and the posterior ones are rather strong, the 

 others are moderately strong or rather weak; the anterior one is about as long as the anterior 

 side of this joint, the posterior one is in most cases not quite twice this length. The rest vary 

 somewhat in length, the longest of them being in most cases about as long as the most posterior 

 one, the shortest about as long as or somewhat shorter than the anterior one; they are all finely 

 pectinated or almost bare; some of them are of the tube-bristle type (there is variation in this 

 last character). Pilosity: A couple of transverse rows of rather long, stiff hairs are found on 

 the two endites. A collection of similar hairs is also seen on the inside of the first endopodite 

 joint, anteriorly at about half-way along the joint. In addition the end joint has a transverse 

 row of similar hairs on the anterior side about half-way along the joint. It is to be noted that 

 the first endopodite joint has no spines at all distally on the inside. 



Fifth limb (fig.27): — The protopodite is unjointed. On its first endite there are 

 two bristles, the proximal one of which is a short and short-haired tube-bristle, the other being 

 about as long as the breadth of this joint (calculating from front to back); it is armed at the 

 middle with numerous rather long, stiff secondary bristles, has short hairs distally and is pointed. 

 On the second endite there are three bristles, two of which are of the same type and about the 

 same length as the short tube-bristle on the first endite, the remaining one being of the same 

 type and about the same length as the long bristle on the first endite. The e p i p o d i a 1 

 plate has only four bristles in the middle group. Endopodite: This has constantly 

 eight bristles. Two of these, one situated proximally on the anterior side of the process close 

 to the protopodite and one situated ventrally near the exopodite, are of the same type and about 

 the same length as the long bristles on the endites of the protopodite. The others have short, 

 fine hairs, almost bare, and are of different lengths; one of these, situated disto-ventrally on the 

 process, is somewhat shorter than the two former, and rather powerful, the one situated close 

 to this is of the same type but only about half as long, one is about as long as the longer of the 

 two powerful ones, but is weak, the others are more or less short and often of the tube-bristle 

 type. Exopodite: First joint: Tliis lias usually five, in exceptional cases four, short- 



