ward and farnished below with a eai gn of naked sete ; 
organs forward in the line of the body, and not outwar 
thoracic legs in male very long, and the right one subchelif 
pointed, in lateral view emarginate. CUR BN. € 
c. Posterior thoracic legs in the male large, the two iB ual, and | 
the right subcheliform ; the right one of the anterior antenna dn the 
same sex having a ofa pe joint about one third its length Jrom 
the ape. 
Genus 5. PoNTELLA.* Anterior antenne multiarticulate, ihe setze 
as in Calanus. Maxillipeds much larger than the first pair of legs, not 
flexed, and having the terminal joints short and setigerous, the setze 
extending forward to the mouth and setulose, as in Acartia ; the first 
pair of legs small and short, not prehensile. "The right posterior tho- 
racie leg in the male large cheliform, the left smaller and often simple. 
Beak furcate. Caudal setz;» more or less spread. (There is a large 
glassy appendage under the head, with a rounded or reniform sum- 
mit.) ! i 
Genus 6. Cawpacia, Dama. Anterior antennz and posterior thora- 
cic legs, nearly as in Pontella ; the first pair of legs much larger than 
the maxillipeds, elongate, and flexed forward, with the extremity inflex- 
ed and bearing a pencil of long naked setz, motion in the line of, the 
body. Front truncate; caudal setze usually not spread. Color often 
in part black or nearly so. 
3. Palpi of the mandibles and. maxille obsolete ; two: sapit 
eyes ? ; also two oblate lenses in the front, and two prolate lenses 
ostii to these within, which may constitute another T of 
eyes. 
Family 4. Conxczipx.  'lentacles short, few-jointed ; exter- 
nal ovaries two. 1 
Genus l. Convcoxus,t Dana. Body not depilessod. Abdomen ab. 
ruptly narrower than the body, 2 or 3-jointed ; second pair of antennse 
* The name Pontia, applied to this group by Milne Edwards, was previously. 
applied to a genus of insects, and has therefore been changed as above. "'T'he ge- 
nus Cetochilus of Roussel de Vauzeme does not differ essentially from Pontella. 
t See Proceed. of Acad. Nat. Sci. of Philad. for October, 1845, p. 285. "'The 
two lenses in these animals are separated by an unobstructed space, and appear 
beyond doubt to serve for the transmission of light. In contact with the posterior 
lens behind is an oblong spot of dark pigment. 'The only other supposition with 
