MY SIDE A. 657 



c, C, mandible in different positions; d, first maxilla; e, second max- 

 illa; /, lower lip; g, inner antennae; h, outer antenna; i, first feet; 

 k second feet; I, one of six posterior pairs; m, extremity of last pair! 



Pacific; latitude 18° to 18° 30' south, longitude 124° to 136° west. 

 Caught two individuals August 7th, 1839, and one August 13th. 



Length, one-eighth of an inch. Colourless and transparent; one 

 specimen purplish along the under side of abdomen and reddish along 

 the sides of the thorax; eyes black, with some blue reflections; the 

 pigment, probably blue-black. Eyes very large globular, the sphere 

 rather shorter than broad, and standing on a short, slender peduncle. 

 Facets in quadrate order. Inner antenna with base oblong cylin- 

 drical, three-jointed, second joint very short, the others oblong, the 

 first longer than third. [The length of the two flagella uncertain, as 

 they were broken in the specimens seen.] Outer antennse with a 

 four-jointed base, which bears an oblong scale at apex of second joint; 

 the scale has outer apex acute and is ciliated on the inner and apical 

 margin; first two joints of base more than twice the diameter of the 

 following two. 



Mandibles moderately stout, having a few blunt teeth at apex. 

 Palpus with the first joint very short, second oblong subovate, the 

 more convex side minutely setulose ; last joint rather slender and 

 acuminate. A stout spine at the base of the mandible, but its exact 

 position was not ascertained ; the figures represent different positions 

 after dissection. The maxillae are narrow oblong, with a few some- 

 what divergent setae at apex, a small short joint attached near middle 

 of inner side. The outer pair of maxillipeds have the second joint 

 subtriangular, narrowing above, longer than palpus alongside. The 

 third joint is oblong and set on the apical and inner margin with 

 short setae. There are two lamellar lobes on inner side of second 

 joint. Lower lip as in figure/. 



Thoracic feet of two anterior pairs much shorter than posterior, and 

 pediform branch not as long as palpus; also no cluster of setae at apex 

 of penult joint, adjoining the claw, as in the following pairs; this 

 pediform branch of the two anterior pairs is not usually in sight in 

 the ordinary motions of the animal, as they are thrown forward near 

 the mouth. Penult joint (or that with which the claw is articulated) 

 cylindrical in the six posterior pairs. The setae at apex about as long 



165 



