186 



BULLETIN OF THE BUREAU OF FISHERIES. 



Maxillae very irregularly spinose, the strongest spine at the upper edge, an irregular notch below it. 

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



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

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

 14, 15, 16, 12 joints. The caudal appendage is long and slender, composed of 13 long joints, with but 

 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 3866, Pailolo Channel, between Molokai and Maui, in 283 fathoms, bottom of gray 

 mud and fine sand. Also stations 4116 and 4117, northwest coast of Oahu. 241 to 282 fathoms, on bottom 

 of 'oral sand and foraminifera; station 3839, south coast of Molokai, 259 to 266 fathoms, bottom of light 

 brown mud anil sand, everywhere on large CHdaris-Yike 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. A. pedunculata 

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

 mandibles and maxillae, 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 A. 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 bristles near the sutures. The mandibles (fig. 2, d) 

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

 respect. The maxillae scarcely differ from those of A. percarinata. The general agreement is so close 

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

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



Alepas rex, n. sp. 



[PI. 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 orifice is slit about half the length of the capitulum. its lips a little crenulated, or irregularly 

 warty; in adults they do not protrude. 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, ami 

 sparsely asperate with small warts, each with a brownish tip. The surface of the peduncle is much and 

 deeply wrinkled transversely. It is cylindric, and expands basally to clasp the supporting surface. 

 The dimensions of two individuals are given below: 



Length of capitulum. . 

 Breadth of capitulum. 

 Diameter of capitulum 



Length of orifice 



Length of peduncle — 

 Diameter of peduncle. 



No. 1. 



m m . 

 21 



20.5 

 10 



11.5 

 19 

 10 



No. 2. 



mm. 

 22 

 19 



15 

 13 

 22 

 9 



The mandibles (fig. 3, b, d) have two strong teeth and two much smaller, more slender ones at the 

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

 from the right and left sides of the same individual. 



The maxillae (fig. 3, a) 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- 

 posed of about 32 and 17 joints, profusely bristly. The second pair has very long rami armed with very 



