58 MR. E. J. MIERS ON CRUSTACEA FROM [Jan. 14, 



Heterocuma sarsi, sp. n. (Plate III. fig. 3.) 



The body is slender ; the carapace or dorsal shield is somewhat 

 laterally compressed, with an obscure median dorsal keel, which is 

 flattened and sulcated posteriorly, and terminates anteriorly in the 

 oculigerous lobe. Viewed laterally, the dorsal outline of the cara- 

 pace is nearly straight, the inferior or lateral margin is at first 

 straight and parallel with the upper, but anteriorly it is curved up- 

 ward toward the front. The antero-Iateral margins meet in front 

 of the eye, but are not prolonged into a rostrum. The surface is 

 smooth, or only very minutely punctulated ; on either side there is 

 a wide and rather deep incision in the antero-Iateral margin, through 

 which the antennules are visible ; and the lobe beneath the sinus is 

 triangular and subacute. 



Five free segments of the body are exposed, the first being very 

 narrow and overlapped upon the sides by the carapace ; the second 

 is longest, with the latero-inferior margins straight ; the third very 

 short upon the dorsal surface, but, like the two following, produced 

 backward at its postero-lateral angle. Similarly the first four post- 

 abdominal segments are produced backward on the sides, the pro- 

 duced portion forming a subacute lobe ; these segments are subequal, 

 the fifth is longer, the sixth rather smaller than any of the prece- 

 ding ; all are marked with longitudinal depressions on the dorsal 

 surface, which are best visible in the dried specimens ; the last 

 segment or telson is represented only by an obscurely bilobate 

 tubercle. 



The large black eye is placed immediately behind the frontal 

 margin. The antennules, visible through the lateral sinus, are short 

 and .^-jointed, the basal joint very short, the second longest and 

 considerably dilated, the third dilated and shorter, the fourth slender 

 and longer, and the fifth very small and ending in a pencil of setaj. 

 The first pair of legs are greatly elongated and slender, the extre- 

 mity being clothed with a pencil of long sette, which arise near the 

 distal end of the penultimate joint ; the fifth pair of legs is very 

 short. The appendages of the first five postabdominal segments in 

 the male are biramose ; the rami flattened, ovate, and fringed at 

 their distal extremities with long and flexible cilia ; those of the 

 sixth segment (uropoda) are fringed with short stiff setee along the 

 inner margins of the base and the inner ramus, of which the two 

 joints are subequal ; in the outer ramus the basal joint is much 

 shorter than the terminal. Length of auimal (excluding appendages) 

 not exceeding | inch. 



A eood series of specimens of botli sexes were collected at a depth 

 of 40 fathoms in lat. 32° 41' N., long. 1-28° 57' E. ; one (a male) 

 occurred at a depth of 50 fathoms, in lat. 33° 19' N., long. 129° 7|' 

 E. ; and two males and a female were taken in lat. 32° 49' N., long. 

 128^56' E. 



Var. granulata. 



In two or three specimens (male and female), collected, with the 

 typical form, in 40 fathoms, in lat. 32° 41' N., long. 128° 57' E., 



