STALK-EYED CRUSTACEA iii 



the palm ; when retracted, almost at a right angle with 

 the palm. Walking legs compressed, naked, with, crests 

 above ; third and fifth joints have crests below. 



Abdomen tuberculated on its sides ; third segment 

 of the male not narrowed. 



Range. — St. Vincent, St. Lucia, Guadaloupe, Florida, 

 Mexico ; in deep water. 



4. Mesorhoea. 



MesorJicva . . . Stimpson, A. Milne Edwards. 



Resembles Solenolanibriis in the form and ornamen- 

 tation of the carapace, the arrangement of the feet, 

 pterygostomian and hepatic regions. The efferent canals 

 meet in the middle of the epistome, which has a tri- 

 angular projection and a deep notch on its vertical and 

 laminiform wall. The fourth joint of the external 

 maxillipedes is advanced in front, with a sharp point 

 at its internal angle, and the fifth joint is completely 

 hidden behind it. The epistome is very short. 



The eyes are small, and can hide themselves com- 

 pletely within their deep orbits. 



The basal joint of external antennae is shorter than 

 the second joint. 



I. Mesorhcea cristatipes. 



McsorJuva cristatipes .... A. Milne Edwards. 



The gastric and cardiac regions are very elevated, and 

 form in the middle line an elevated ridge ; there are three 

 tubercles, one posterior and median, the two others 

 anterior and arranged symmetrically on the gastric 

 region ; there are two median elevations on the cardiac 

 region. The branchial regions are very prominent, and 



