1296 



CRUSTACEA. 



The length in a side view is very nearly twice the height. The 

 gibbosity behind is much larger and more prominent than in the 

 punctata. The eyes have a quivering motion. The eggs occupied all 

 the space over and posterior to the abdomen, behind the eyes. 



CYPRIDINA FORMOSA. 



Compresso-ovoidea ; latere visa, breviter elliptica, infra supraque vulde 

 arcuata, fronte rostrato, rostro subacute, ultra rnarginem testae infero- 

 anticam vix saliente, rnargine postico intemipto, non gibboso; superne 

 visa, angusto-elliptica, extremitatibus obtusis. AntenncB anticm elongate 

 setigerce, setis antennd parce longioribus. Pedes mandibidares artkulis 

 3tio itoque tenuibus. Spimdce caudales decern. 



Compressed-ovoid ; in side view short oval, above and below strongly 

 arcuate, behind with an interruption in the margin but not gib- 

 bous, in front rostrate, beak acute, front scarcely prominent beyond 

 the margin of the shell below; in upper view, narrow oval, obtuse 

 at the extremities. Anterior antennae long setigerous, setae a little 

 longer than the antenna. Mandibular foot with the third and 

 fourth joints slender. Caudal spines about ten. 



Plate 91, fig. 5 a, lateral view of animal, enlarged ; a', natural size; 

 b, dorsal view ; c, lateral view, with valve of shell removed, showing 

 members ; d, first pair of antennae ; e, second pair of antennae ; /, 

 mandibular foot, with mandibular process at d' ; g, ciliated plate from 

 second pair of maxillae ; h, third pair of maxillae. 



Collected off Upolu, one of the Samoan Islands, 9 p. m., February 

 26, 1841. 



Length, one-tenth of an inch. Colour, purplish, with scattered dots 

 of deep purple. 



The front over the beak scarcely projects beyond the outline of the 

 shell below the beak. The interruption in the margin behind is very 

 narrow, and abrupt upward. The length in a side view hardly one- 

 fourth greater than height ; greatest height just posterior to middle. 

 In vertical view, length about three times greatest breadth. The 



