

10 qq CRUSTACEA. 



and stout, and although not properly prehensile, for it has no proper 

 hand, its size fits it for prehension (or clasping in coition), and it is, 

 probably, so used,— whence the propriety of placing the species with 

 the Phronimidae. The legs of the third and fourth pairs are usually 



prehensile. 



The included genera and subfamilies are as follows: — 



Subfam. 1. PHRONIMINiE. — Abdomen versus basin sat gracile. 

 Pedes 5ti magna manu didactyla vel monodactyla confecti, 3tii 

 4ti extremitate graciles, non prehensiles. [Antennae breves.] 

 G. 1. Phronima, Latr.— Maims pedis 5ti didactylae. Segmentum thoracis lmum 



oblongum. 

 G. 2. Primno, GWnft,- M&naa pedis 5ti monodactylae. Segmentum thoracis 

 lmum non oblongum. 



Subfam. 2. PHROSINI1SLE.— Abdomen versus basin sat crassum. 

 Pedes 5ti prehensiles, monodactyli; quoque 3tii 4tique prehensiles. 

 [Antennas sat breves.] 



1. Manus pedis 5ti latas, digito arcuato. 

 G. 1. Anchylomera, Edw*— Manus pedis 5ti late et crasse subtriangulatsK. 



Pedes 6ti non prehensiles. 

 G. 2. Phrosina, Buso.f— Manus pedis 5ti latae, oblongss. Pedes 6ti prehensiles, 



5tis fere similes, minores. Mandibulaa non palpigerse. 



2. Manus pedis bti elongate* Uneares, digito recto, longissimo, tenui. 

 G. 3. Themisto, Guerin. — Pedes 3tii 4tique prehensiles, manibus latis. 



Subfam. 3. PHORCIN^E.— Pedes 5ti 6tive valde elongati et crassi, 

 sed manu non confecti. [Antennae breves.] 



G. 1. Phorcus, Edw.— Pedes lmi 2di 3tii 4tique graciles, unguiculati, 5ti 6tique 

 prselongi, 5ti aciculares, 6ti crassissimi. 



* Hieraconyx, Guerin. f Dactylocera, Latreille. 



