1298 



CRUSTACEA. 



apex of the first joint, and often also at the adjoining base of the 

 second, there is a corneous prominence with a broad denticulate apex, 

 which is mandibular. 



The first pair of maxillae consist of a stout base, much prolonged 

 laterally and terminating in several spines; this part bears from the 

 basal portion a three-jointed extremity in the genus Halocypris, if not 

 also in Conchoecia ; the second joint of which is broad and stout, and 

 both this and the third are furnished with several setae. 



The second pair of rnaxillce (or the maxillipeds), as observed in a 

 species of Halocypris, have a basal joint, like the first pair both in 

 form and in its spinigerous extremity. To the basal part of this 

 base, there is attached a small lamina, which is edged with long setae, 

 and also a slender oblong three-jointed extremity, which bears at 

 apex one or two very long bent or curved setae. This appendage 

 extends backward like the following pairs of legs, instead of forward 

 and inward like the corresponding part of the first pair of maxillae. 



The two pairs of feet are slender, the anterior much the longer; one 

 or both have a lamina at base edged with setae, and also several setae 

 at apex. 



The caudal extremity is very much like this part in the Cypridinae. 



Genus CONCHOECIA, Dana. 



Testa oblonga. Pedes mandibulares articulis tribus idtimis inflexi, 2do 

 midtwn oblongo. 



Oblong in form. Mandibular feet having the last three joints inflexed, 

 the second straight and much elongate. 



The species referred to this genus have a short projecting beak, and 

 an oblong body, subrectangular in outline, though rounded at the lower 

 anterior angle. The opening in the shell in front, through which the 

 antennae and spiculum are protruded, is quite large. The anterior an- 

 tennae are long and slender, and consist of three joints; the first half 

 the whole organ in length, the last short. The setae are straight, 

 except towards apex, where they are curved. One is quite stout and 

 denticulate on the inner side ; two are very slender, and one of the 

 two a little shorter; a third is flexed from its base directly backward 

 parallel with the base of the antenna. 



