o-,q CRUSTACEA. 



ther division), Grapsus, Trichopus, Eriocheir, Pachysoma, Goniopsis, 

 Platynotus, Brachynotus, Nautilograpsus, Cyclograpsus, and in his 

 "Decas Septima," published in 1849, he unites with the group, Pinno- 

 theres and Hymenosoma. 



Family I. GONOPLACLLLE. 



The following are the characters of the genera of Gonoplacidoe : 



Genus I. Eucrate,* Be Ilaan. — Carapax antice arcuatus, parce 

 declivis, Panopaeo forma antennisque affinis. Appendices maris geni- 

 tales e sterno ortse abdominisque teetce. Pedes maris antici breves, 

 crassi. Oculi breves. Abdomen maris 5-articulatum, versus basin 

 sterno contiguo vix angustius. 



Genus II. Curtonotus, Be Ilaan. f — Carapax antice arcuatus, parce 

 declivis, margine antero-laterali rotundato. Appendices maris geni- 

 tales e basi pedum orta? in canaliculo sterni ducta i , deinde abdoniine 

 tectaa. Oculi breves. Pedes maris antici pradongi. 



Genus III. Gonoplax, Leach. — Carapax latus, trapezoidalis, antice 

 elongate transversus, angulis anticis acutis. Appondicibus mark 

 genitalibus Curtonoto affinis. Oculi longi. Pedes marls antici prae- 

 longi. 



Genus EUCRATE, Ih 1km a. 



The species of this genus have nearly the characters of Pilumnus 

 or Panopasus, but the position of the male verges removes them from 

 the Cancroidea. They differ from the Curtonoti in having these 

 organs proceed from the sternum beneath the abdomen. Our species 

 has a subtrapezoidal form, with the anterolateral margin rounded, 

 thin and dentate. Width of the front, about one-third the width of 



* De Haan, in Faun. Japon., 3G ; Geryon, Kroyer, Tidskr., i. (1837), 15, PL 1. 

 f De Haan, Faun. Japon., p. 20. PseudorlwmbUa, Edwards, Crust., ii. 58. 



