no 



POST-TERTIARY ENTOMOSTRACA. 



C Antenna; destitute of swimming setae, and of poison gland and duct. Mandible-palp^ 

 Darwin- \ 3-jointed, the basal joint large and densely setiferous. Two pairs of jaws, first with a f jp^^yj^^g^^^ 

 ELLiDiE 1 large branchial plate, second with a smaller branchial plate and a pediiorm palp. Two ( 

 ( nairs of feet external to the valves. Postabdominal lobes subconical, small . . .) 



t3 



> 



A t 



o I 



'-3 ^ 





13 



O 



o 



Lower 



antennae 



4-jointed. 



Upper 



antennae 



Lower 



antennae 



5-jointed. 



Upper 



antennae 



r 



5-jointed ; 

 last three 

 joints 



elongated, 

 their united 

 lengths more 



rdestitute of spines ; bearing only a few short | ^^.^^^^^^_ 



slender setse 



f alike. Internal (" well developed . 

 more or less I lobe of the first ■ 



the preceding 

 joint ; 



than that of-{ g^j.^^jgiy gpi. | paii- of maxillae (. I'udimentary 



,\ 



niferous. 



Feet in the"] dissimilar; i-ight foot of first pair^ 

 male and fe- I in the male prehensile, right of 

 male | the second pair very weak and 



[^rudimentary 



i 



Cythere. 

 Eueythere. 



Cytheridea,. 



short and stout, their united length shorter than that of the pre-"^ 

 ceding joint, beai-ing long cui-ved spines. First two pairs of feet I j^ ■.-, 

 only 3-jointed. Right foot of last pair in the male prehensile, t 

 Eyes wanting J 



short, their united length equal to that of preceding joint, bearing ") (\in,Qy:^ig 

 ^short setse only •) 



6-jointed ; 

 beset with 

 simple 

 setae ; last 

 four joints 



f short and gradually decreasing in length . 



<{ of moderate length, unequal, penultimate the longest 

 I 

 [^mostly much elongated and slender ; unequal 



Xestoleberis, 



Metacypris. 



Loxoconcha. 



7-jointed ; first two joints very large and stout, last five slender and bearing ") t> .j „™,ii™„ 

 ^moderately long setae ^aa 



'5-jointed ; beset with short scattered hairs. Postabdominal lobes broad and 1 n ij. f, f ^n 

 short, bearing three setae. No eyes ^ V P 



6-jointed ; 

 last four 

 joints 



•i 



much narrower than the preceding, and beai'ing scattered short ") 



hairs, which are in part spiniform. Postabdominal lobes rudi- [• Cytherura. 



mentary, destitute of hairs. Two separate eyes 



.3 



I not narrower than the preceding, and beset towards the apex") 



with numerous long setae. Postabdominal lobes larger than > Sclerochilus^ 

 Inordinary, bipartite, and bearing five setae. One eye . . .) 



7-jointed, bearing numerous very long setae, last joint very long and slender ; ") 

 two basal joints large and stout. Postabdominal lobes subconical, directed > Fseudocythere^ 

 ^downwards, and bearing three hairs. Eyes wanting . . . . . j 



VAnimal unknown 



Sarsiella. 



Mouth simple, tubiform ; its orifice surrounded by a circular disk 

 situated at the apex of a large subconical protuberance. Organs of 

 mastication poorly developed and weak. Mandibles styliform ; 

 palp very narrow, destitute of a branchial appendage. First pair 

 of jaws composed of narrow and partly imperfect lobes. Inferior 

 antennae, 5-jointed; upper, 6-jointed 



very slender and soar- ^ tj j j 

 mgly setose . . . ) 



excessively slender and} -t^- 7 • i.-? 

 quite destitute 01 setae . ) •' 



