TOO STALK-EYED CRUSTACEA 



not constitute a great part of the inferior orbital margin, 

 but is very small and usually does not reach to the front, 

 and, with the next joint, occupies the narrow hiatus 

 intervening between the front and the inner subocular 

 angle of the orbit. 



Subfamily Parthenopinae. 



PartJicnopiiice . . ... Miers. 



Carapace equilaterally or transversely triangulate or 

 elliptical. Strongly marked depressions exist, separating 

 the branchial from the cardiac and gastric regions. 

 Rostrum simple. First pair of legs greatly developed, 

 with the palm trigonous; fingers acute. 



Synopsis of the Genera. 

 I. Carapace not laterally expanded. 



A. Carapace triangular. 



a. Basal joint of external antennae ^^'^ '~"' 

 short ; second joint is longer or as long ^-".^n^ 

 as the first. — {Lanibrus.) 



b. Basal joint of external antennae 

 is longer than the second joint. — Lambnts. 

 {Parthenope.) 



B. Carapace pentagonal. / 



c. A sharp ridge separates the pterygo- '^'^ 

 stomian from the subhepatic region. — {So/cno- 



la Ul brus.) Solcuolauibms. 



d. The efferent branchial channels meet ^.,;^-^ 



in the middle of buccal cavity. — {Mcsorluva.) / ]/ 



II. Carapace more or less laterally ex- K/r~f '■ 

 panded. W ■•' 



e. Carapace triangular, without posterior f_J_ 



expansion.— (/AVd'mv;)/'/.^) Heteroaypta, 



