116 



POST-TERTIARY ENTOMOSTRACA. 



! Antennae destitute of swimming setas, and of poison gland and duct. Mandible-palp ^ 

 3-jointed, the basal joint large and densely setiferous. Two pairs of jaws, first with a I j)g^^^- 77 

 large branchial plate, second with a smaller branchial plate and a pediform palp. Two I 

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



/ 



Lower 



antennae 



4-jointed. 



Upper 



antennae 



Lower 



antennae 



5-jointed. 



Upper 



antennae 



r 



5-jointed; 

 last three 

 joints 



elongated, 

 their united 

 lengths more 

 than that of 

 the preceding 

 joint ; 



^destitute of spines ; bearing only a few short ") 

 slender setae j 



more or less 

 strongly spi- 

 niferous. 



Feet in the ' 

 male and fe 

 male 



f alike. Internal C well developed . 

 lobe of the first < 

 pair of maxillae (. rudimentary . 



dissimilar ; right foot of first pair"^ 

 in the male prehensile, right of | 

 the second pair very weak and I 

 rudimentary 



6-jointed ; 

 beset with 

 simple 

 setae ; last 

 four joints 



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

 ceding joint, bearing long curved spines. First two pairs of feet 1 

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

 Eyes wanting J 



short, their united length equal to that of preceding joint, bearing ") 

 i^short setae only j 



f short and gradually decreasing in length 



I 



■{ of moderate length, unequal, penultimate the longest 

 I 



(^mostly much elongated and slender ; unequal .... 



7-jointed ; first two joints very large and stout, last five slender and bearing ") 

 Immoderately long setee . ) 



'5-joiated ; beset with short scattered hairs. Postabdominal lobes broad and ") 

 short, bearing three setae. No eyes j 



lAmnicy there. 



Cythere. 

 Eucythere. 



Cytheridea. 



Krithe. 



Cytherideis. 



Xestoleheris. 



Metacypris. 



Loxoconeha. 



Bythocythere. 

 Cytheropteron^ 



6-jointed ; 

 last four 

 joints 



r much narrower than the preceding, and bearing scattered short 



I hairs, which are in part spiniform. Postabdominal lobes rudi- > Cytherv/ra. 



1 mentary, destitute of hairs. Two separate eyes . . . .) 



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



I 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 lai'ge and stout. Postabdominal lobes subconical, directed > Pseudocythere. 



downwards, and bearing three hairs. Eyes wanting 



VAnimal unknown 



Mouth simple, tubiform ; its orifice suri-ounded 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. Pirst jjair 

 of jaws composed of narrow and partly imperfect lobes. Inferior 

 antennae, 5-jointed; upper, 6-jointed 



very slender 

 ingly setose 



and spar 



Sarsiella. 



j Paradoxostoma. 



excessively slender and 7 -t^ • 7 • 7, •? 

 quite aestitute 01 setae . ) ^ 



