studies on marine Oslracods •)4l 



Second a n t c ii u a: — The p r o t (i |) o d i t e lias a short bristle disto-medially 

 close to the exopodite. Exopodite: The first joint has no bristles. Kndopodite: 

 The first joint has a number of short or moderately long bristles. 



Mandible: — This is very powerfully built, rather elongated and has its joint de- 

 cidedly flattened at the sides. Protopodite: Coxale: This has no bristles. The scythe- 

 shaped process has comparatively numerous and large ventral spines. Basale: The backward 

 pointing process is well developed and is armed with rather numerous bristles. Dorso-distally 

 this joint has two bristles and in addition to these it has a relatively large number of bristles 

 dorsally and ventrally. The exopodite is comparatively well developed. E n d o p o d i t e : 

 The first joint has a rather large number of bristles ventrally at the middle ; apart from these it has no 

 bristles. Second joint : Along the whole of the anterior edge there is a forest of exceedingly numerous 

 bristles situated close together. The medial cleaning bristles are also very numerous and are 

 arranged in transverse rows anteriorly on the joint. Postero-distally on this joint there is \ 

 group of a rather great number of bristles. The anterior bristle of the end joint is not claw-shaped. 



Maxilla: — The protopodite has a large lamellif orm epipodial appendage, 

 which is about half as long as the basale. The latter joint has dorso-proximally very numerous 

 bristles arranged in a row. There are no endites distinctly developed. The baleen bristles are 

 of the same type as in the genus Asterope; the proximal bristle in the baleen is also of about 

 the same type as in this genus. Endopodite: The end joint has a number of bristles. 



Fifth limb: — The comb is relatively high and has along its ventral edge abundant 

 bristles of somewhat different lengths and with fine hairs. i 



Sixth limb: — Seen from the side this is shaped like a broad-axe; the posterior 

 and anterior margins are rather strongly concave, the ventral margin is weakly convex; it has 

 well pointed corners, both anteriorly and posteriorly. Seen from beneath it is somewhat sole- 

 shaped anteriorly, flattened and with its anterior edge rounded; posteriorly it is narrow, lamelli- 

 form. Along the anterior edge and the larger part of the ventral edge it has abundant bristles. 



Seventh limb: — This is moderately long ; its distal part is considerably widened. 

 It has a comparatively large number of cleaning bristles, two or three of which are often situated 

 near one another on the same side of the same ring. Distally it has four end combs, arranged 

 in pairs, of which the two that belong to the one pair are situated dorsally and ventrally 

 respectively of the other pair. 



F u r c a: — The lamellae are short; their breadth is somewhat greater than their length. 

 Each lamella is armed with about eight to ten slender claws, finely curved ventrally. Of these 

 the anterior ones are relatively long, the others either decrease uniformly in length posteriorly, 

 so that there is no distinct division into main claws and secondary claws to be observed, or 

 else a few of the posterior claws are typical secondary claws. At the base of some of the middle 

 claws there issues a rather powerful and moderately long bristle. Behind the claws there are 

 abundant moderately long, stiff hairs. 



Remarks: — The species of this genus that have been dealt with so far in the literature 

 are unfortunately very incompletely described. It was therefore impossible to carry out a 



