HYPE RIDE A. 999 



Pacific, latitude 18° south, longitude 122° west. Collected, August 

 6, 1839, at 5 a.m. 



Length, one-eighth of an inch. Colour, intense blue, with a barely 

 perceptible tinge of red. 



The rows of facets of the eyes cross at right angles, and, therefore, 

 are not hexagonal; they are round, however, instead of square, the 

 interstitial spaces being occupied by a grayish cellular substance. 

 The whole number of facets between forty and fifty. 



The inferior antennae about three-fourths as long as the body. The 

 last two joints of base of superior are equal. Appendage to superior 

 pair short and three-jointed, as in preceding species. The second pair 

 of legs is slender, the joints cylindrical ; the third and fourth pairs 

 terminate in a moveable finger formed of the last two joints. Last 

 three pairs very nearly equal, the sixth a little the longest, claw 

 nearly straight. 



A longitudinal vessel was observed in the thorax, along the back, 

 which from its pulsations was evidently the heart. 



The general form of this species is like that of the jS. ultrarnarina, 

 but the head is sharp and narrower, and the second pair of legs differs 

 in its articulations, as w r ell as the antennse. The drawing represents 

 the coxa of fifth pair of legs about half as broad as the same in sixth 

 pair. The coxa of the seventh pair is similar to that of the ultramarina. 



Family II. PHRONIMID^. 



There is a wide diversity among the legs of the last three pairs in 

 the Phronimidse. The fifth may have a stout, well-formed hand, 

 while the two following pairs have the usual unguiculate character; — 

 or the hand may consist of a long, slender style, which has the power 

 of folding against the two preceding joints, one or both of which is 

 also elongated; — or the fifth pair may be very long and slender, with- 

 out the power of prehension, while the sixth pair is unusually large 



