538 



BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



'■'Thorax: The pleural plates are very larg-e oval lanielhe, only con- 

 nected with the segment b}^ somewhat less than the posterior half of 

 their interior margin, and this result is due to the fact that they 

 anteriorl}' are very much produced, highly overlapping each other, 

 and posteriorly rather shortly produced. The legs are tolerably 

 slender; the second joint not expanded; the fifth joint elongate, in 

 the last pair as long as the hand. 



"Abdomen: It is turned to the left in a startling degree and is pro- 

 portionally small — perhaps ver}" small. The dorsal surface is soft- 

 skinned, the segments more or less dis 

 tinctly separated. Pleural plates are not 

 developed. The pleopods quite soft, of 

 medium size, decreasing conspicuousl}^ 

 in size from before l)ackward and at- 

 tached to the lateral margin; each pleo- 

 pod consists of a short peduncle and 

 two lamellar oblong rami; the outer 

 ramus much larger than the inner one. 

 The uropods-biramous; the outer ramus 

 a little smaller than the outer of the 

 fifth pleopod, the inner ramus very 

 short, almost rudimentary. The pleo- 

 pods are curled to such a degree that it 

 would have been impossible without 

 much construction to draw a sketch of 

 the abdomen. 



"(J) Ilale.— The body is a little more 

 than three times longer than broad, and 

 from the fourth thoracic segment it 

 decreases in breadth towards both ends. 

 (Fig. 581/>.) 



" Head: The dorsal surface rather con- 

 vex; the median portion of the anterior 

 margin almost straight. No eyes. The 

 frontal border bent slightly downwards 

 (Fig. 581r^) The antennulas rather 

 short, three- jointed; the basal joint tol- 

 erably thick and partly overlapped by the rostrum; the second joint 

 slender and rather short; the third ver}' small. The antennie com- 

 parative! \" long, seven-jointed; the four proximal joints of about 

 the same lengtli, but decreasing much in breadth from the rather 

 thick basal joint to the fourth one; the tiftli joint is short and very 

 slender, the last two joints exceedingly small. The mouth forms a 

 rostrum, Avhich, when seen from below, is triangulai', considerably 

 depressed, and directed forward, reaching almost to the frontal margin 



Fig. 581. — Bathygyge gr.\ndi.s (Akter 

 Hansen), a, Head of male (yen 

 TRAL VIEW), b, Dorsal view of male. 

 c, First leg of male, d, Fifth leg of 



MALE. 



