[69] DECAPODA FROM ALBATROSS DREDGINGS. 413 



Station 2099, October 2, north lat. 31° 12' 20", west long. G9^ 30', 

 2,949 fathoms, globigerina ooze — 1 S in rather bad condition, No. 5464. 

 The specimen is labeled '• White when fonnd." 



Hymen oPEN^us microps, sp. nov. 



(Plate X, Fig. 1.) 



This is very closely allied to E. debilis Smith (Bull. Mus. Conip. Zool., 

 X, p. 91, pi. 15, tigs. G-11, pi. 16, figs. 1-3, 1882), but is readily distin- 

 guished by the verj^ much smaller and nearly hemispherical eyes, which 

 in H. debiUs are large and reniform as in the typical species of Penccus. 

 The species is represented by two females only, and one of these imper- 

 fect. 



As in the typical species the whole integument is very thin and deli- 

 cate so that the form of the body is not very well preserved in the alco- 

 holic specimens. The carapax is slightly compressed laterally and dor- 

 sally carinated nearly the whole length, but the carina is indistinct back 

 of the cervical suture. The rostrum is horizontal, less than a third as 

 long as the rest of the carapax, narrow vertically, tapers regularly to 

 an acute point, is wholly unarmed below, and armed above with five 

 nearly equidistant teeth, of which the posterior is just back of the orbit 

 on the carapax proper, while far back on the gastric region there are 

 two other teeth in the dorsal carina. 



The eyes are black, scarcely reach the middle of the proximal segment 

 of the antennula, are approximately hemispherical and very small, the 

 diameter equaling only about half the length to the base of the stalk. 



The antennal scale is about half as long as the carapax excluding the 

 rostrum, and rather more than four times as long as broad. 



The oral appendages are almost exactly as in S. debilis. In the de- 

 scription and figure of the last-mentioned species I overlooked the proxi- 

 mal articulation in the endopod of the maxilliped, which is composed of 

 four segments. In both species the proximal segment is less than half 

 the whole length, broad at base, but the inner margin abrui^tly con- 

 tracted beyond the middle, leaving an angular projection, which is armed 

 with long setae 5 the three distal segments are approximately equal in 

 length ; the second segment curves round beyond the end of the proto- 

 pod ; the last two are very narrow and margined with a regular series 

 of slender plumose setre, which are much longer upon the outer than 

 ni)on the inner edge. 



The second gnathopods and all the periTeopods except the fifth pair 

 have very minute rudimentary exopods as in H. debiUs. The three pairs 

 of chelate perseopods are very nearly as in H. debilis. The fourth and 

 fifth perffiopods are very long, slender, and nearly naked. The fourth 

 are about as long as the carapax including the rostrum ; the merus and 

 carpus are subequal in length, and together make fully two-thirds the 

 whole length ; the propodus is slightly more than a Ifeurth as long as 



