studies oil murine Ostracods 



495 



joints. The a-claw is smooth. The c-bristle has four or five, usually five filaments, the 

 f-bristle has four or five filaments and the g-bristle has six filaments. 



Second antenna: — This is like that of A. Mullen. The fourth to the ninth 

 joints on the e x o p o d i t e liave basal spines. The e n d o p o d i t e is rather distinctly 

 threejointed; its end bristle is about as long as or slightly longer than the stem. 



Mandible: — Protopodite: Coxale: The scythe-shaped process (fig. 6) is 

 very like this process in A. Mulleri. It is to be noted: The dorsal serrate teeth, although very 

 small, are perhaps slightly more strongly developed than in the species mentioned. Basale: 

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

 in the preceding species, only one dwarf l)ristlc. On the triaena bristles were observed from 

 two to five pairs of spines below the distal pair. The glands emerge on a rather well developed 

 peg, but this is not so large as in fig. 9 of A. spinifera. The dorsal side of this joint is quite 

 smooth, without either hairs or bristles. The exopodite (fig. 5) is rather powerful; if its 

 end bristles are included, it is about as long as or slightly more than three-quarters of the length 

 of the anterior side of the first endopodite joint. Endopodite (figs. 5 and 7): The shortest 

 one of the three ventral bristles of the first joint has short hairs; the two others have a few pairs 

 of short secondary bristles proximally of the long secondary bristles. This joint is not armed 

 with any chitinous spines antero-distally. The second joint has only one proximal bristle, which 

 is somewhat less than a third of the length of the main bristle a. Between the main bristles 

 b and c there is a long, narrow bristle with short hairs. The medial cleaning bristles vary to 

 some extent; they are rather numerous and are arranged in two rows; six specimens that were 

 investigated showed the following conditicms: 



Type specimen: 

 Right and left mandible 



( 



7 bristles in a distinct lower row. 



I 2 



insidi 



,, upper ,, 

 the main bristle b. 



Kight 



Specimen no. 2. 

 md left mandible 



Specimen no. .'?. Right mandil)l<' [ 8 



Left 



As in the type specimen; the lower row was, however, less 

 distinct, its inner bristles were somewluit dislocated. 



f 7 bristles in a distinct lower row. 



,, ., M upper „ 

 close to the main bristle b. 



I 1 bristle 



( 7 bristles in a distinct lower row 



\ 



,, ., „ upper ., 

 inside the main bristle b. 



Right 



„ Left 



7 

 G 



n 



in a 



distinct lower row. 



,, ,, ., upper .. 



,, .. row inside the main bi'istle b. 



.... .. lower row. 



.... upper .. 



above bristles nos. 1 and .3 of the latter row. 



