MYSIDEA. 661 



basali instructs; internee bifidce. Pedes sex prominentes, duo postici 

 dbsoleti (?). Appendices abdominis rudimentarii. Segmentum abdo- 

 minis posticum angustum, apice truncatum vel obtusum et spinulis 

 armatum. 



Carapax rostrate. Eyes elongate-oval, looking laterally, the lenses all 

 lateral, being directed outward or sparingly oblique. Second an- 

 tennae having a scale from the base; first pair bifid. Six prominent 

 pairs of feet, the two posterior obsolete (?). Abdominal appendages 

 rudimentary. Last abdominal segment narrow, truncate or obtuse 

 at apex and armed with spinules. 



The eyes have an oblique arrangement on the pedicel, as in Cyr- 

 topia, but here the facets are more lateral, covering a large part of the 

 lateral surface, and the pigment is oblong. The abdominal legs may 

 be immature, and so also, the thoracic; yet we doubt somewhat on 

 this point, since the specimen was nearly half an inch in length. 



LOXOPIS TRIDENS. 



Carapax acute rostratus (rostra oculis valde breviore) juxta rostrum 

 spind utrinque armatus, ad medium dorsum regionis ga-strici dente 

 triangulato instructus. Oculi oblongi, obliqub ovati. Segmentum 

 abdominis posticum basi parce latius, apice truncatum et spinulis 

 ciliatum, spinulis dudbus externis plus duplo longioribus. Lamellae 

 caudales segmento caudali vix breviores. ' Pedes mediocres; palpo 

 cylindrico uni-articulato, setis brevibus paucis apicalibus; ramo altero 

 etiam uni-articulato (an pedes maturi ?) non longiore. 



Carapax with an acute beak much shorter than the eyes, and having 

 a spiniform tooth either side, also a triangular tooth on the back of 

 gastric region. Eyes oblong, obliquely ovate. Last segment of 

 abdomen a little broader at base, truncate at apex, and ciliate with 

 spinules, the two outer spinules more than twice as long as the 

 others. Caudal lamellae hardly shorter than caudal segment. Feet 

 of moderate size, palpus oblong cylindrical, one-jointed, having a 

 few short setce at apex; other branch also one-jointed (feet per- 

 haps not mature), and not longer than the palpus. 



166 



