STALK-EYED CRUSTACEA 163 



Three teeth on inferior margin of orbit ; inner one 

 large, and flattened on its outer surface. 



External antennae are long. 



Fingers and infero-exterior surface of hands smooth 

 and naked ; the naked part sharply defined by an oblique 

 line on the outer surface. 



Range. — St. Thomas. 



II. Pilumnus fragosus. 



Pilummis fragosns ... A. Milne Edwards. 



The carapace is flat behind and sloped in front. 



The regions are distinct, but the grooves which separate 



them are not very deep. The gastric region has five 



tubercles, one median, at the extremity of the meso- 



gastric lobe, and one on each epigastric and protogastric 



lobe. These tubercles have thin stalks and broad flat 



heads. There is a similar tubercle upon the hepatic 



region. The front is sloped and is formed of two lobes 



more advanced in the middle than on the sides ; their 



edge is unarmed, straight, or slightly concave. The 



superior and internal orbital angle is flat and thick. 



The superior orbital border has no granulations or 



fissures; it terminates on the outside in a fungiform 



projection ; the inferior border has two teeth. The 



antero-lateral border is divided into three teeth ; the 



first, contracted at its base, is wide and thick at its 



extremity ; the second is thinner, but swollen a little 



at its end ; the last is very small and pointed. The 



space which separates the orbital angle from the first 



tooth is occupied below by a lobiform subhepatic tooth. 



The inferior orbital angle forms a thick and prominent 

 lobe. 



The first pair of legs has large fungiform tubercles 



