studies on marine Ostracods 537 



distance distaily of the point of the process. The dorsal serrate teeth arc rather few, but large. 

 The main spine is moderately developed. Four ventral spines are developed, of which the two 

 distal ones are very weak, scarcely perceptible. ()u the part distaily of the main spine four 

 or five transverse rows of hairs were observed. The rod-shaped process seems to be armed 

 distaily with three short, coarse spines. Basale: The backward pointing process has four distal 

 l)ristles, three or four triaena bristles and two dwarf bristles; on the specimen investigated the 

 left mandible was armed with four triaena bristles, the right one with only three; it looked, 

 liowever, as if the latter limb too had originally had four of these bristles. On both limbs the 

 anterior triaena bristle was rather decidedly reduced; it was only about half the length of the 

 others. The triaena bristles are armed with from two to five pairs of spines proximally of the 

 main jjair of spines. The glands of this process emerge on an almost entirely reduced peg. At 

 about the middle of the dorsal side of this joint there is a single bristle, which is about half as 

 long as the dorsal side of this joint and has short, fine hairs distaily. In addition this joint 

 has a few groups of short fine, stiff hairs dorsally on the outside. The e x o p o d i t e is, if 

 its two distal bristles are included, about two-thirds of the length of the anterior side of the first 

 endopodite joint. Bndopodite: Of the three ventral bristles on the first joint the shortest 

 one has, somewhat proximally of the middle, about ten to fifteen long secondary bristles arranged 

 on all sides; distaily of these there are short hairs. The two other of these bristles have no short 

 secondary bristles proximally of the long ones. This joint is not armed antero-distally with 

 spines. Second joint: this has two proximal bristles (length?). There is no long, narrow, short- 

 haired bristle between the main bristles b and c. The medial cleaning bristles were alike on the 

 right and left mandibles of the specimens investigated: there were five bristles in a distinct lower 

 row, two bristles below the main bristle b and one between the main bristles a and b. The end 

 claw is powerful and about as long as the anterior side of the first endopodite joint; it is smooth. 



Maxilla (fig. 6): — Protopodite: The distal endite is armed with three subequal 

 l)ristles. The dorso-proximal bristle is short. The basale has one moderately long ventral bristle 

 and one dorso-distal bristle which is somewhat shorter than the former bristle. This joint has 

 a short ventero-distal bristle developed, though it is extremely short and weak. Endopodite: 

 The postero -distal bristle of the first joint is about as long as or only slightly shorter than the 

 bristle of the end joint. 



Sixth limb: — This seems to have six anterior ventral bristles; the number of 

 posterior ventral bristles could not be determined with certainty. On the anterior edge of this 

 limb there are, besides the two bristles that are usually found in species of this genus, five 

 additional rather short bristles (these were found only on the limb of one side; that of the other 

 side was defective at this place). 



Seventh limb: — This is armed witli fifteen or sixteen cleaning bristles of moderate 

 and somewhat different lengths; of these bristles six are situated distaily on the limb, three 

 on each side, the others are scattered somewhat proximally of the former ones; there are about 

 the same number on each side. Each cleaning bristle is armed with only from one to three 

 bells. Each end comb consists of about eight teeth, which are finely, evenly and similarly pectin- 

 ated (abovit the same as is shown in fig. 13 of A. quinquesetae). 



Zoolog hirtrag. Upp«;ala. SiippI -Rrt. I. 08 



.»»? 





