ISOI'ODS OF NORTH AMERICA. 441 



tluttened in front, and pioducod into a modcruteh- larj^e acute proc-Cfss; 

 the front margin outside the base of each antennula produced into a 

 rather large process, which is broad at the base, while its distal part is 

 shaped as a narrow, acute hook, curved somewhat inward. Eyes large, 

 oblong, ver}^ oblique; the outer margin extremelj^ convex, the inner 

 very concave: their posterior j)art overlaps the lateral margin of the 

 head itself. 



'■' Antennuhv have the second joint of the peduncU^ inoderatel}' 

 robust and somewhat shorter than the third; tlagcdluni 9-jointed, as 

 long as the sum of the two proximal joints of the peduncle. 



"AnteniiiB have the basal joint, seen from above, distally cut oti' 

 transversely, its outer angle acute. l)ut not produced into any process. 



"First thoracic legs rather short. Third joint distally widened, but 

 without process; fourth joint with the upper part nearl}^ from the base 

 strong!}" expanded, compressed, and distally produced into a process of 

 moderate length and breadth; lifth joint similarl}- expanded and dis- 

 tally produced into a long slender process. Hand a little more than 

 twice as long as deep; upper margin rather feebly convex, with a few 

 settle; lower margin straight, only half as long as the upper, with 

 numerous very long hairs; distal end as long as the lower margin; 

 palmar edge very o])li(iue, a little sinuate, furnished with six very stiff 

 seta', proportionatel\' long and increasing in length downward, pecti- 

 nate along their upper margin, and at the end of the edge a moder- 

 ately robust very long spine pectinate as the sets' ; the angle between 

 palmar edge and lower margin measures about J 30'-. Seventh joint 

 with its claw daw-shaped, reaching a little beyond the lower end of 

 the palmar edge; the joint is adorned below with serrated spines and 

 hnely curved sette as in <S'. iitedUerraneiojt^ but the spines are less 

 numerous, onl}" about ten. 



"Abdominal shield is somewhat broader than long; each lateral 

 margin is adorned wnth five small nearly spiniform processes, increas- 

 ing in size backward and placed at regular intervals, the last of these 

 processes being that at the usual notch. Posterior mai'gin is rather 

 evenly but moderately curved. 



"" Uropoda wanting. 



"Length of the single adult female. (i mm." — Hansen." 



STENETRIUM OCCIDENTALE Hansen. 



Slenetriuni occidentale Hansen, Proc. Zool. Soc. J^ondon, 1905, II. I't. 2, )>]>. I>24- 

 325, pi. xx, figs. 2a-2n. 



Locality. — St. Thomas. West Indies. 



"Head shaped as in x^>'. antillense; its upper surface (the frontal 

 plate excluded) is considerably less than twice as broad as long; the 

 lateral part, seen from above, is feebly expanded and produced into a 



«Proc. Zool. Soc. London, 1905, II, Ft. 2, pp. 323-324. 



