studies on maiiin' Oslracods 22.'? 



Sub-Genus Doloria n. sub-gen. 



Description: — Shell: — Its form is somewhat different in male and female, though 

 tliis difference is rather slight. — It is oval without or with only a weakly developed posterior 

 corner. The rostral incisur is narrow and comparatively deep; near the inner edge of the incisin 

 there are two medial bristles situated close to each other. With rather strong calcification. 

 The species of this sub-genus hitherto known are moderately large. 



First antenna: — This is long, slender and has eight joints; for the proportion 

 between the joints see the diagnosis of the sub-family. The sensory bristle of the fifth joint 

 has thirteen sensory filaments. Three of the filaments on bristles b and c are modified in the 

 male for seizing the female. Of these three filaments, all proceeding from the medial side of 

 tlie bristles, the proximal one issues just at the base of the bristles; this is short and powerful, 

 swollen at the base and strongly chitinized distaUy, almost spine-like; medially at about half its 

 length it has a single suctorial organ. The two other filaments are relatively long and have 

 distally-medially on one side a series of small suctorial organs all of about the same type and size. 

 The end bristles are not much longer in the males than in the females. 



Second antenna: — The protopodite has one medial-distal bristle. 

 Vj X o p o d i t e: The bristle of the second joint is rather powerfully developed. The natatory 

 l)ristles on the third to the ninth joints are quite without spines. The third to the ninth joints 

 have basal spines. Endopodite: In the male this branch is developed into a powerful 

 triple-jointed clasping organ, the end joint of which has, besides the proximo-ventral bristle, 

 two very short distal ones as well. In the female it is comparatively rather well developed, 

 I'longated, and triple-jointed; its end joint is, however, sometimes rather weakly marked. The 

 bristle of the end joint is long. 



Mandible: — Protopodite: The endite on the coxale is simple distally oi' 

 lias only indications of bifurcation; its spines are partly rather powerful, especially those situated 

 distally-medially and have only rather a slight tendency towards arrangement in groups. Apart 

 from the bristle of the endite there are no bristles on the coxale. Basale: Of the ventral bristles 

 one d-bristle is very long, has numerous long secondary bristles and is furnished with short 

 hairs distally, the rest vary from being moderately long to very short and have generally short. 

 tine hairs or are quite bare. This joint has three or four bristles dorsally. Endopodite: 

 The first joint has four bristles ventrally. The end joint has six or seven bristles, one of the 

 posterior ones may be missing; — this is noteworthy, as in all the other forms of this-sub-family 

 dealt with in this work, as well as in the species of the unh-iamily Philomedinae, seven bristles 

 are always developed on this joint — : the two middle of these bristles are rather powerful, 

 claw-shaped, and about as long and as strong as each other. 



Maxilla: — Protopodite: The coxale has dorso-distally a single bristle with 

 long and fine hairs. Proximally on the outside of the third endite there is a single bristle. On 

 the boundary between the basale and the first endopodite joint there are three bristles, one close 

 to the exopodite, one at about the middle of the inside of the endopodite and one on its anterior 



