H50 CRUSTACEA. 



Plate 80, fig. 11 a, animal, enlarged ; a', extremity of antenna; b, 

 male right antenna; c, side view of head; d, mandible and palpus; e, 

 maxilla; /, first pair of legs; g, posterior thoracic feet; h, natatory 

 leg, one of three posterior pairs. 



Collected near El Gran Cocal, latitude 5i° south, longitude 175° 45' 

 east, March 25, 1841 ; and in the Kingsmill Group, 1° 13' south 

 longitude 174° 50' east, April 1, 1841. 



Length, one-seventh of an inch. Colour, blue. The beak is long, 

 and very much incurved. The front is a little prolonged at middle and 

 acute. The superior eyes have large spots of pigment, which are in 

 contact. The length of the caudal stylets a little exceeds the breadth. 

 The longer hairs towards the base of the anterior antennae are two or 

 three times as long as the diameters of the joints, and one of thera 

 curves forward and inward. In the right antenna of male, after four 

 or five oblong joints at base, there is a tri-articulate stout joint, as long 

 as the part of the antennae following it ; the two articulations inter- 

 secting it are towards its base ; and near its middle there is a minute 

 spine and a seta, beyond which the margin is very finely pectinate ; 

 beyond this long joint there is the geniculating articulation. Then 

 follows a long joint, whose apex is lineally prolonged nearly to the 

 apex of the following joint, and the margin is very finely pectinated. 

 The posterior margin of this and the preceding joint is very nearly 

 straight. The last three joints are nearly like the same in the female. 



The mandible has six teeth, and a two-branched palpus, as in the 

 figure. The right posterior foot has the second joint very large and 

 broad, the form approaching subquadrate, with the outer angle broadly 

 and deeply removed; it has articulated with it a finger, hardly ex- 

 ceeding half its length and uncinate at apex, which finger is opposed 

 to a short spine from the basal portion. The large second joint folds 

 back against the side of the preceding. The other leg is simple and 

 naked. 



PONTELLINA ACUTA. 



Frons elongate acutus, rostro brevi, vix inflexo. Cephalotliorax 5-articiir 

 latus, capite discrete, angulis ponticis elongatis, acutis. Oculi mpe- 



