18(i 



BULLETIN OF THE BUREAU <>F ITSHERIES. 



Maxilla' very irregularly spinose, the strongest spine at the upper edge, an irregular inilch Ijelnw it. 

 There are two nearly as large in the median part (fig. 2, b). 



The cirri (fig. 2, .\) are rather short. The exopodites have 8, 15, 17, 18, 18, 14 joints in the first 

 to sixth pairs of limh.«, respectively, the endopodites being usually a little more slender and with 7, 14, 

 14, 15, Ifi, 12 joints. The caudal appendage is long and slender, composed of 13 long joints, with liut 

 few bristles (fig. 2, a). The penis is closely wrinkled and annulate, with a few bristles and a pencil of 

 hairs at the tip. 



Albatross station 38Gli. Pailolo Channel, between Molokai and Maui, in 283 fathoms, bottom of gray 

 iiuid and fine sand. Also stations 4111) and 4117, northwest coast of Oahu, 241 to 282 fathoms, on bottom 

 of coral sand and foraminifera; station 3839, south coast of Molokai. 259 to 2()() fathoms, bottom of light 

 brown nnid and sand, everywhere on large Cirforis-like sea-urchin spines. 



This Alepas belongs to the group having cirri with subequal rami. It is externally distinguished 

 by the absence of plates in the integument, the small orifice and the acute dorsal keel. .4. peduncitlata 

 Hoek, is perhaps the most nearly related form, differing by some details of the denticulation of the 

 mandibles and niaxillBe, by the absence of red spots dotting the capitulum, etc. 



The oldest specimens lose the sharpness of the dorsal keel, and become plumper. 



At station 3828 off the south coast of Molokai, 281 to 319 fathoms, broken shell bottom, a sea-urchin 

 spine was brought up carrying two specimens of Alepas similar to _4. percarinata except that they show 

 no traces of a dorsal keel except close to the base of the capitulum. The latter is 4 mm. long — a size 

 which in percarinata is very strongly keeled. The cirri and caudal appendage are as in A. percari- 

 nata, but the joints of the tailpiece bear pairs of bri.stles near the sutures. The mandibles (fig. 2, d) 

 differ by showing no lower point distinct from the fourth tooth, the two sides lieing alike in this 

 respect. The maxillse scarcely differ from those of ^1. percarinata. The general agreement is so close 

 that I am disposed to believe that the specimens may have lost their carinse by accidental means; but 

 if it be a normal form, a new species is indicated. 



Alepas rex, n. sp. 



[PL IV, fig. 7.] 



A large species with irregularly ovate, obese capitulum, longer than the peduncle, straightened on 

 the occludent margin, and without trace of calcareous or chitinous plates. Color pale ocher yellow, a 

 little darker on the peduncle. 



The oriiici' is slit about half the length of the capitulum, its lips a little crenidated, or irregularly 

 warty; in adults they do not protrudi>. The ventral side is elsewhere rounded; the dorsum is marked 

 by a low ridge or angle. The surface of the capitulum is irregularly pitted, somewhat wrinkled, and 

 S|)arsely asperate with small warts, each with a brownish tip. The surface of the peduncle is much and 

 deeply wn-inkled transversely. It is cylindric, and expands basally to clasp the supporting surface. 

 The dimensions of two individuals are given below: 



mm. 



Lengtli of capitulum 21 



Breadth of capitulum 20. 5 



Diameter of capitulum 16 



Length of orifice 11. 5 



Length of peduncle 19 



Diameter of peduncle 10 



mm. 

 22 

 19 

 15 

 13 

 22 

 9 



The mandibles (fig. 3, b, n) have two strong teeth and two much smallc>r, more slender ones at the 

 lower extremity (fig. 3, b\ or there may be three at the lower extremity (fig. 3, d(. the two figured being 

 from the right and left sides of the same individual. 



The maxilUe (fig. 3, .\) have a densely spiny edge, which is deeply excavated below the upper 

 spine. 



The cirri are long and graceful. The first pair is much shorter than the others, the rami broad, com- 

 po.sed of al)out 32 and 17 joints, profusely bristly. The second pair has vei-y long rami armed with very 



