M A IO I D E A. 129 



which are quadrate with a straight or truncate summit, but are 

 scarcely at all prominent. 



In the female the anterior feet are not stouter than the following. 

 The fingers are denticulate, the teeth triangular and about seven in 

 number. The penult joint of the posterior legs has the truncate 

 margin more oblique ; but the angle is rather nearer the apex than 

 the base, and the number of teeth in a row on the tarsus is twelve to 

 fourteen. 



Acanfhonyx Petiverii, El)W., Crust., i. 343. 



GENUS PELTINIA, Dana. 



Epialto Acanthonyci<?M qffinis. Carapax latus, sublcevis, depressus, ros- 

 tro brevi complanato, biftdo, latitudine transorbitali grandi, quam dimi- 

 dium carapacis vix angustiore, dente prceorbitali prominente, antero- 

 laterali valde producto, postero-laterali parce praniinente. Antennae 

 externce rostro non celatce, articulo primo angusto, apicem non denti- 

 gero. Oculi non retractiles, breves. Pedes Imt 2dis breviores. Arti- 

 culus 8 pedum posticorum penultimus fere cylindrieus infraque non 

 gibbosus. 



Carapax broad, depressed, smooth or nearly so; beak short, flat, bifid; 

 transorbital breadth scarcely less than half that of carapax; prae- 

 orbital tooth prominent ; antero-lateral angle very much enlarged, 

 and postero-lateral also slightly prominent ; outer antennae not 

 concealed by the beak, first joint narrow, not dentate at apex. 

 Eyes not retractile, short. First pair of feet shorter than second. 

 Penult joint of eight posterior feet nearly cylindrical, not gibbous 

 below. 



This genus differs from Epicdtus in having the front as in Acan- 

 thonyx, the outer antennae being exposed alongside of the beak; and 

 from Acantlionyx, in having the penult joint of the legs subcy- 

 lindrical, and without a gibbous prominence for the tarsus to close 

 against. Instead of this prominence, there is sometimes a small 

 cluster of short setae, and in other instances the setae are wanting. It 

 is near Antilibinia; but the breadth across the eyes is much greater, 

 being nearly or quite half the greatest breadth of the carapax, while 

 it is only a third in that genus. 



33 



