studios on marine Ostracods 



495 



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

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



Second a n t e n n a: — This is like that of A. Miilleri. The fourth to the ninth 

 joints on the exopodite have basal spines. The e n d o ]) 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. Miilleri. 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 bristle. 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 c[uite 

 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-((uarters of the length 

 of the anterior side of the first endopodite joint. E n d o p o d i t e (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 conditions: 



Type specimen: 

 Right and left mandible 



Specimen no. 2. 

 Right and left mandible 



Specimen no. 3. Right maiulibh' 



Left 



( 7 bristles in a distinct lower row. 

 „ ,, „ upper „ 



l2 



inside the main bristle b. 



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

 I distinct, its inner bristles were somewhat dislocated. 



( 7 bristles in a distinct lower row. 



! S •. ,, ,, ., upper ,, 



V 1 bristle close to the main bristle b. 



( 7 bristles in a distinct lower row. 



6 



u: 



,, ., ,, upper ,, 

 inside the main bristle 



4. Right 



Left 



I « 



u 



I- 



the main bristle b. 



in a distinct lower row. 

 „ „ „ upper „ 

 ,, „ ,, row insid(! 



,, „ „ lower row. 

 ., ., „ upper ,, 

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



