iSliulios on inMi'inc Oslracoils 513 



the point of the process to the main tooth is considerably less than the distance from the latter 

 to the proximal ventral spine. The dorsal bristle is attached at about the same distance from 

 the point of the process as its distance from the main spine and is almost opposite the latter; 

 it extends somewhat distally of the point of the process. The dorsal serrate teeth are rather 

 weak. The main spine is moderately developed. There are five ventral spines, of which the 

 proximal and the distal ones are rather weak. On the part distally of the main spine there are 

 no transverse rows of hairs at all. The rod-shaped process has three short distal spines. Basale: 

 The backward pointing process has four distal bristles, four or five triaena bristles and two 

 dwarf bristles. The triaena bristles have from two to five pairs of spines proximally of the distal 

 pair of main spines. The glands of this process emerge on quite a reduced verruca. At about 

 the middle of the dorsal side of this joint there is on the left mandible one, on the right mandible 

 two, short bristles; two such bristles are seldom found on both the right and the left mandible; 

 in most cases there seem to be no hairs at all on the dorsal side of this joint. Exopodite: This 

 is very small, only about a quarter to a sixth of the length of the anterior side of the first endo- 

 podite joint. Endopodite: First joint: The shortest of the three ventral bristles has 

 short hairs, the two longer ones have no short secondary bristles proximally of the long ones. 

 This joint is not armed antero-distally with chitinous spines. Second joint: This has only one 

 proximal bristle, which is about a third of the length of the main bristle a or somewhat shorter. 

 Close to the proximal bristle there is a cluster of short fine hairs. No long, narrow bristle with 

 short hairs is found between the main bristles b and c. The medial cleaning bristles are relatively 

 few and short, and differ somewhat in number both from one individual to another and on the 

 left and right mandibles of the same individual; four to six were observed in a distinct lower 

 row and one close to the main bristle b. The end claw is strong but comparatively short, slightly 

 more than twice as long as the end joint; it is smooth. 



Maxilla (fig. 13 — 15): — P r o t o p o d i t e: The distal endite has three suber^ual 

 bristles. The dorso-proximal bristle is very short, almost entirely reduced. The basale has 

 one ventral bristle and one dorso-distal bristle, both relatively short and subequal; the short 

 ventero-distal bristle is developed sometimes, but often seems to be lacking. Endopodite: 

 The postero-distal bristle of the first joint is somewhat shorter than the bristle of the end joint. 



Sixth limb (fig. 16): — This has a rather broadly rounded posterior corner. There 

 are 17 — 25 posterior and seven anterior ventral bristles; on the anterior edge of the limb there 

 are two bristles. 



Seventh limb: — This has twelve cleaning bristles, six of which are situated close 

 together distally, three on each side, and six scattered somewhat proximally of the former ones, 

 three on each side. Each cleaning bristle is armed with from two to five bells. Each end comb 

 consists of from 14 to 16 teeth, all of which are evenly and finely pectinated and somewhat 

 strengthened distally (about the same as in fig. 13 of A. quinquesetae). 



F u r c a (fig. 17): — This has ten claws, of which the six or seven anterior ones may be 

 called main claws. On the two or three anterior main claws there are some — the number varies 

 to some extent — irregular, rounded small teeth ventero-proximally. (These do not form a 

 direct continuation of the rows of fine, sharp ventral teeth that are usually developed in the 



Zoolog. bidra?. Uppsala. .Suppl -T^cl I. 65 



