51() BULLETIN 54, UNITED 8TATES NATIONAL MUSEUM. 



to the biisc of the insertion of the pleopods. The last segment of the 

 abdomen l)ears only two uropods, of the same conformation as tlie 

 pleural lamelhv and the outer l)ranches of the pleopoda of the preced- 

 ing segments, but they are of a length exceeding the longest of these" 

 appendages. Turned l)ack and laid on the dorsal surfac<^, they extend 

 to the middle of the thorax. 



The male, unknown in the other species of the genus, recalls a great 

 deal, in its general form, that of the genus CdnericejMHi. It measures 

 in its greatest dimension 0.55 mm. The first antennje are composed 

 of three articles, the second antenna? of five articles, the most of 

 which are furnished with stiif hairs; there are no maxillipeds. In 

 the median line of the thorax are spherical tul)ercles which are also 

 present in the same place on the tirst three segments of the al)domen; 

 their external sui-face is covered with little pectinate scales. The legs 

 are short, robust, and terminate in a pointed claw. The genital open- 

 ings are visible on both sides of the ventral tubercle of the seventh 

 thoracic segment, and in a clear area lighter than the rest of the 

 cuticle. Rudiments of pleopods are seen on the first live segments of 

 the a])domen, and the uropods are represented on the sixth segment 

 only by two little bunches of stiff hairs. 



In general there is but a single adult male on a female; I ought, 

 however, to note as rather frequi^nt the presence of several males on 

 the same female; I have counted just four of them between the pleo- 

 pods and the pleura, and, a curious thing, all of them having al)so- 

 lutely the same form, they do not have the same size. One of them 

 was a little more than half the size of the largest, the other two were 

 of intermediate size. The ventral bosses appeared in the three indi- 

 viduals of smaller size on the live segments of the abdomen, while in 

 the largest specimen they actually were present only on the first three. 

 It is })robable that the number of these bosses decrease with age. The 

 same fact is equalh" true of Cancricepon elegant/'- 



«The above description is adapted from the following one of Bonnier's: 

 La femelle adulte a une forme generale globuleuse, aplatie sur la surface dorsale 

 et terminee a son extremite posterieure par un bouquet d'appendices effiles a bords 

 digites; elle niesure, du bord frontal au sixieme somite du i)lec)n, 1 mm., 9. La tete 

 forme une masse unique et saillante qui est entouree antt'rieurement et sur les cotes 

 par une large lame anterieure flottante; a la face interne se trouvait, a une assez 

 grande distance, Tune de I'autre, les antennules tres petites et tri-articulees; les deux 

 derniers articles portent quelques petites soies et leur surface est squameuse; les 

 antennes sont egalement courtes, le premier article est large, a moitie sonde au cc'pha- 

 lon et les quatre autres articles climinuent d'importance jusqu'au dernier qui porte 

 quelques soies; leur surface presente le meme aspect que celui de I'antennule. Le 

 rostre est proeminent et particulicrement net; de la pointe echancree de la levre infe- 

 rieure on voit sortir I'extremite des niandibules qui est en forme de cuilleron ii bord 

 finement denticule. Le maxilliiK'de posscde un palpe allonge termine i)ar de petites 

 soies tres courtes. Le bord iufcrieur du ceijbalon est decoupe de part et d'autre jiar 



