Classification of the Decapod Crustaceans. 4S5 



i. Endostoiue ridges strong and project on 



fore edge of mouth Eriphiirus. 



ii, Endostome ridges moderate and make no 



projection on foro edge of mouth .... Trapeziinee. 



Key to the Sahfamilics of the Gonoplacidaj. 



I. Last pair of legs present. 



1. Male openings sternal. Eye-stalks almost 



invariably fixed. Eyes often reduced. 

 Front usually narrow. [Male abdomen 

 does not ueai-ly cover space between la^t 

 two legs.] 



2. Male openings coxal. Eye-stalks generally 



movable. Eyes normal. Front broad, 

 i. Front occupies whole breadth of carapace. 



(1) Male abdomen does not cover space 



between last pair of legs Prionoplacirue . 



(2) Male abdomen covers space between 



last pair of legs Gonoplacina. 



ii. Front does not occupy whole breadth of 

 carapace. [Male aodomen covers space 

 between last pair of legs/] Carcinoplacittce. 



II. Last pair of legs wanting. [Male openings 



sternal. Male abdomen does not cover space 

 between last pair of legs. Eyes small. 

 Front narrow.] Hexapodince. 



Key to the Subfamilies of the Grapsidre. 



I. First antennae placed in clefts of the front 



and vii-ible from above. [No oblique line 

 on the third maxillipeds and no wide gap 

 between them. Male abdomen covers the 

 space between the la.^t pair of legs.] Playusiin(P. 



II. First antenn.ie not visible from above. 



1. Third ma.xillipeds have an oblique hairy 



line along the ischiopodite and meropo- 



dite, and leave a wide gap between them. Sesarmino). 



2. Third maxillipeds have no oblique line. 



i. Front strongly detlexed. A wide gap 

 between the third maxillipeds. Male 

 abdomen covers the space between the 

 last pair of legs Ocypodhue. 



ii. Front not strongly deilexed. The gap 

 between the tliird maxillipeds, if present, 

 is rarely wide. Male abdomen rarely 

 covers space between last pair of legs. . Varuniixa;, 



Key to the Subfamilies of the Ocypodidiv. 



I. First antenna) transverse, separated by a nar- 

 row septum. Front of moderate breadth. 

 Body snallow, usuallv quadrilateral and 

 broader than long. [S'o opening between 

 the bases of the legs.] Macrophthalmina. 



