2168 CRUSTACEA. 



orange, with a broad crimson band across the middle. Only this one 

 specimen was seen, while of the former, having a green colour and 

 silvery back, there were great numbers uniformly alike in colour, 

 both male and female. A pair of oblong blue glandular masses were 

 observed in the posterior part of the cephalothorax, and also in the ante- 

 rior part, either side of the mouth ; also, two small spots of the same 

 colour were situated near the middle of the cephalothorax, on the 

 medial line. 



PONTELLA PRINCEPS. 



Feminae : — Caput discretum, subtriangulatum, f route obtusiuscuhim. 

 Cephalothorax §-articulatus y posticd elongate acutm, articulis tribus 

 posticis subosquis. Ocidi super lores remoti ; inferiores mediocres, parce 

 elongati. Antenna? anticae, cephalotliorace parce breviores, rectiuscidw, 

 ferme 110° divaricates, setis brevibus, apiadi anticd articidos diios 

 cequante, ceteris apicalibus et subapicalibus brevioribus. Styli caitdales 

 perbreves. [Abdomen ^-articidatum, distorturn.'] 



Female: — Head separate, subtriangular, front rather obtuse. Cepha- 

 lothorax stout, posterior angles long and divaricately acute, pos- 

 terior segments three. Superior eyes remote, inferior a little elon- 

 gate. Anterior antennae slightly shorter than cephalothorax, 

 nearly straight, divergent 110°; setae short, anterior apical about 

 as long as two joints, the other apical and the subapical not longer 

 than a joint or shorter. Shorter branch of posterior antennae about 

 half the other in length. Caudal stylets very short; setae spread- 

 ing. [Abdomen four-jointed, gibbous.] 



Plate 82, fig. 4 a, animal, enlarged; a', extremity of an antenna; 

 b, beak, in profile ; c, posterior part of cephalothorax and abdomen, m 

 profile. 



Collected, March 29, 1840, in the Pacific, two hundred and fifty 

 miles south by west from Tongatabu, on a calm day. 



Length, one-fourth of an inch. Colour, deep blue, with a pearly 

 white back. This is the largest Pontella seen by the writer. The 



