200 STALK-EYED CRUSTACEA 



by slightly granulated ridges, has a spine above the base 

 of the movable finger on the inner side. Walking legs 

 short and thin. The last joint of the fifth pair wide and 

 oval. Abdomen of the male lanceolate; the last segment 

 is very small, and dovetailed into the fourth. 



Range. — West Indies, East Coast of the United 

 States, Gulf of Mexico, New Zealand. 



Tribe III. Catometopa. 



Catojiietopa (part) . . Miers. 



Catometopcs | H. Milne Edwards. 



Ocypodidcc (part) J 



Grapsoidca .... Dana. 



Qjiadrilatcra (part) . Latrcille. 



The body may be thick or thin from above down- 

 wards. The carapace is almost always wider than long, 

 and regularly rhomboidal or oval, sometimes almost 

 circular. The gastric region is large, and usually divided 

 posteriorly by a median prolongation of the genital 

 region ; the hepatic regions, when they are indicated, 

 are very small ; the branchial regions occupy almost the 

 whole length of the lateral border of the carapace. The 

 front is never advanced in the form of a rostrum, it is 

 usually strongly curved downwards, and often completely 

 vertical ; the fronto-orbital border occupies almost the 

 whole breadth of the carapace ; the lateral borders are 

 straight or more or less curved, but never divided into 

 two distinct portions ; the posterior border is usually very 

 long. The eyes have usually long and thin peduncles. 

 The orbits are almost always directed upwards and for- 

 wards ; their internal angle has usually an hiatus which 

 lodges a portion of the base of the external antennae. 



The internal antennas may be vertical or longitudinal, 



