326 DR. H. J. HANSEN ON THE [IS'OV. 29^ 



joints of antennse is certainly not correct in sevei-al details, 

 especially in the shape of the eyes and of the basal joint of the 

 a ntennse, but, so far as I can see, the head with its upper appendages 

 does not present difi'erences of importance fi"om those of my two 

 allied species. 



First thoracic legs present real differences. In the male the 

 process from the lower side of the fifth joint is even longer than 

 in *S'. occidentcde, and besides not triangular but of about the same 

 depth for two-thirds of its length. The hand is longer and pro- 

 portionately more slender than in my two species ; it agrees with 

 aS'. antillense and differs from S. occidentale in having the proximal 

 half of the lower margin convex, but it differs from S. antillense 

 in being nearly three times as long as deep, with the proximal 

 half not deeper than the distal one ; the palmar edge is occupied 

 by two moderately low, narrow processes with the end bifurcate. 

 (This description is derived from fig. 48 ; my statement concerning 

 the two bifurcate processes does not agree with the author's 

 description : " . . . . three large spines, the inner one being bifur- 

 cate," but I hope that the figure is coi-rect.) In the female the 

 lower process on the fifth joint is longer than in S. occidentale \ 

 the hand is, according to fig. 49, nearly twice as long as deep, thus 

 more slender than in my two species, besides the angle between 

 the lower margin and the palmar edge is larger, measuring about 

 125°. 



Length has not been stated by Miss Richardson ; according to 

 the degree of enlargement of her figures, the species must be 

 larger than S. antillense or S. occidentale. 



Occurrence. Bermudas. Many specimens were taken, at least 

 some of them, "in corallines, at low water." 



8, Stenetrium antillense, sp. n. Adult male and small immature 

 female. (Plate XX. figs, 3 »-3 i ; Plate XXI. figs. 1 «-l e.) 



This species is so closely allied to S. occidentale and S. stehhingii 

 that it is preferable to point out the differences instead of giving 

 a complete description. 



The head is shaped as in S. occidentale ; the eyes have the same 

 position. 



Antennulse have second and third joints subequal in length ; 

 flagellum in the male about as long as the sum of the two 

 preceding joints, with from nine to eleven joints. 



Antenna have their basal joint as in S. occidentale. 



First thoracic legs show some important diffei-ences in their distal 

 half .^ — In the male the fifth joint is below as much produced as in 

 S. occidentale, but the process is differently shaped : its proximal 

 half is expanded above and excavated on the upper half of the 

 outer side in order to receive the proximal lower jaart of the hand ; 

 the oblong-triangular, freely protruding part of the process looks 

 therefore much shorter than in S. occidentale, in which it is 

 regularly oblong-triangular and quite free to about the articula- 

 tion of the hand. The hand is deeper than in S. occidentcde and 



