STALK-EYED CRUSTACEA 



99 



which separate the projections are wide and deep ; those 

 of the branchial regions Hke those on the cardiac region. 

 The antero-lateral border is cut into three large round 

 lobes. There are two or three projections behind the 

 last lobe, upon the branchial region. The basal joint of 

 external antennae is not broad. The first pair of legs is 

 of moderate length ; the extremities of the pincers are 

 finely toothed ; the movable finger is unarmed, even in 

 adult males. The arm is nodulus, and has in front two 

 small tubercles. 



The females are much smaller than the males. In the 

 young the antero-lateral lobes are more pointed. The 

 first pair of legs is more spiny on the arm ; the walking 

 legs are thinner, longer, and the hairs upon them are 

 more abundant. 



Range. — Guadaloupe, St. Thomas, Florida, Gulf of 

 Mexico, Brazil, 



Legion II. Parthenopinea. 



PartJicnopiiica . . . Dana, Miers. 



Basal joint of external antennre very small, and 

 embedded with the next joint in the narrow hiatus 

 between the front and the inner suborbital angle ; the 

 infraocular space being mainly occupied by the inferior 

 wall of the orbit. 



Family IV. Parthenopidae, 



Partheuopidcc . . Miers. 



Eyes usually retractile within the small circular and 

 well-defined orbits ; the inferior wall of the orbit is con- 

 tinued to within a very short distance of the front. The 

 external antennae are very slender ; the basal joint does 



