310 CRUSTACEA. 



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

 Platynotus, Brachjnotus, Nautilograpsus, Cyclograpsus, and in his 

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

 theres and Hymenosoma. 



FAMILY I. GONOPLACIDJE. 

 THE following are the characters of the genera of Gonoplacidae : 



Genus I. EUCRATE,* De Haan. Carapax antic arcuatus, parce 

 declivis, Panopaeo forma antennisque affinis. Appendices maris geni- 

 tales e sterno ortce abdominisque tectae. Pedes maris antici breves, 

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

 sterno contiguo vix angustius. 



Genus II. CURTONOTUS, De Haan.-f Carapax antice arcuatus, parce 

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

 tales e basi pedum ortas in canaliculo sterni ductas, deinde abdomine 

 tectas. Oculi breves. Pedes maris antici praelongi. 



Genus III. GONOPLAX, Leach. Carapax latus, trapezoidalis, antici 

 elongate transversus, angulis anticis acutis. Appendicibus maris 

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

 longi. 



GENUS EUCRATE, De Haau. 



The species of this genus have nearly the characters of Pilumnus 

 or Panopaeus, 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 anterorlateral margin rounded, 

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



* De Haan, in Faun. Japon., 36; Geryon, Kroyer, Tidskr., i. (1837), 15, PL 1. 

 f De Haan, Faun. Japon., p. 20. Pseudorliombila, EDWARDS, Crust., ii. 58. 



