CRUSTACEA. 



GENUS PEKINEA (Dana). 



Pericerae affinis. Orbita antice paulo aperta eoque non bene tubulata, 

 margine superiore non unifisso. Arliculus antennarum externarum 

 \rnus oblongus, antice non latior, apice externo paulo productus. 

 Rostrum breviuseidum, cornubus divaricatis. Carapax tumidus, pau- 

 cis tuberculis tumidis ornatus. 



Near Pericera. Orbit, anteriorly somewhat open and not shut in as 

 in Pericera; superior margin without a fissure. First joint of outer 

 antennae oblong, not broader at apex. Beak rather short, furcate, 

 horns separated. Carapax tumid, having a few tumid tubercles. 



The orbit in this genus is not so completely tubular as in Pericera, 

 the anterior side being more open, so that the eye has some forward 

 motion. The posterior side only projecting, there is some resem- 

 blance to the orbit in Leucippa. Moreover, the first basal joint of the 

 exterior antennae is oblong, not broad at apex. The body of the 

 species seen is very tumid, and the tubercles are prominent on the 

 posterior half, though not acute. 



PERINEA TTJMIDA. 



Carapax valde tumidus, brevis (lat. maximd long, post-rostralem 

 cequante), lateribus rotundatis, regione mediand convexd minutj* bi- 

 tuberculatd, regione cardiacd largd tuberculiformi, laterali tumide 

 tri-tuberculatd. Rostrum breve, laMtudine trans-orbitali fere duplo 

 brevius. Spina prce-orbitalis brevis, subacuta. Pedes breves, articulis 

 Stio ktoque spinose tuberculatis, manu crassd, digitis latissime' hianti- 

 bus, digito mobili prope basin unidentato. 



Very tumid, short (post-rostral length about equal to greatest breadth), 

 sides rounded and thick, medial region convex, with two minute 

 tubercles, cardiac region with a large prominent tubercle, and the 

 lateral with three prominent tubercles either side. Beak short, 

 nearly twice shorter than the trans-orbital breadth. Prseorbital 

 spine short, subacute. Feet short, third and fourth joints spinoso- 



