PYCNOGOXIDA. 9 



completely covered with stiff setae, largest distally. The propodus is curved, with a 

 very distinct swelling ventral ly at the proximal end ; this swelling bears half-a-dozen 

 strong spines, the rest of the ventral surface being occupied by a band of stout spinous 

 setae about half the size of the proximal group. DorsaUy the setae are fewer and 

 weaker, a narrow space appears devoid of them laterally. The terminal claw is long 

 and slender, about two-thirds the length of the propodus, to which it is articulated at 

 the ventral angle. There are no auxiliaries, and the projecting heel is small. 



The Genital apertures of the male occur on the second coxae of the two posterior 

 pairs of legs ; in the female they occur on all the legs, on a conspicuous swelling of 

 the coxa. 



The adult male bearing ova, described above, was taken in Winter Quarters in 

 125 fathoms, on a bottom of small stones and organic debris (June G, 1903). A 

 smaller specimen, taken at the same time and place, is rather severely mutilated, having 

 lost one of its ovigers and four legs. Its sex is indeterminable, but it is probably 

 immature. The first segment of the trunk is distinct ; the others can be traced, but 

 with difficulty. The limbs are much more spinose than in my type ; everywhere the 

 tubercular enlargements from which the stiff setae arise are more abundant, especially 

 on the first coxa and the femur. The oviger also is very different. The first three 

 joints are small, the third having an oblique termination which involves half its length ; 

 the fourth is as long as the two preceding, the fifth a trifle longer ; the sixth is very 

 short, and the seventh scarcely twice as long. Of the three terminals the middle one 

 is the shortest, the other two being subequal in length. From the sixth each successive 

 joint becomes more slender. The entire appendage is completely devoid of setae, but 

 on the inner margin of the seventh joint are three curved spines ; on the eighth joint 

 there are two, and on the terminal one there are six, one of them occupying the position 

 of the terminal claw. An adult female was taken in 41 fins. (Jan. 30, 1903). The 

 femora contain ripe ova and are swollen in consequence. The setae are generally 

 finer than those of the male. The oviger, too, resembles that of the male. The 

 denticulate spines are fairly well preserved, and under a high power (^" obj.) show a 

 short shaft with three small, but strong, teeth. Then follows a flattened ovoid blade 

 with a minutely toothed margin, the teeth of which are of a totally different diameter 

 to those on the shaft. On the terminal joint these spines are more curved than 

 elsewhere and the terminal claw does not exist, its place being taken by a mudi worn 

 example of the denticulate spines. Another occurs more dorsally, but is broken oft' in 

 this specimen. 



I believe I am correct in identifying these specimens with the /'. cornigera of 

 Professor Mobius and with the C<n/y/<W//7c fnn'/>i<'fi of Professor Bouvier. Though I 

 have seen both species, I must admit that I have not examined them with that care that 

 the fact of a second closely allied species having been found demands. 



The essential difference between the ' Discovery ' and the 'Valdivia' spednieiis 

 occurs in the length of the legs, which are half as long again in the latter specimens. 



N 2 



