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Part III. — Twenty-third Annual Report 



FAM. STENHELIIDifi. 



Genus Ste?ihelia } Boeck (1864). 



Stenhelia pygmaia, Norman and Scott. 



1905. Stenhelia pygmcea, N. and S., Ann. and Mag. Nat. His. (7), 

 vol. xv., p. 284. 



This small species has recently been noticed in a gathering of Crustacea 

 collected at Station II., Firth of Forth, on December 26, 1894.* It 

 was described by Norman and Scott from a specimen dredged near 

 Eddystone Lighthouse by Rev. Canon A. M. Norman.t 



S. pygmcea is one of the smaller species belonging to this genus, and 

 measures only about of an inch in length ; it appears to differ from 

 other described species by the peculiar structure of the antennules and of 

 the first pair of swimming feet, and by the form and armature of the fifth 

 pair. 



Genus Ameira, Boeck (1864). 



Ameira elegans, sp. n. PI. x,, figs. 18 and 19 ; pi. xi., figs. 1-9. 



Description of the Female. — The body, which is moderately elongated 

 and slender, has a general resemblance to Canthocamptus palustris, but 

 it is rather less robust and somewhat smaller ; the specimen figured 

 measured only "7mm. (nearly of an inch) in length (pi. xi., fig. 1). 



Antennules moderately elongated, eight-jointed, and sparingly seti- 

 ferous ; the second joint is considerably longer, and the fifth and seventh 

 smaller than the others (pi. xi., fig. 2). The formula shows the lengths : — 



Proportionate length of the joints, 13 • 23 • 14 • 15 . 9 • 10 • 7 1 11 

 Number of the joints, - - -12345678 



The antennae (posterior antennae) are moderately large, and are each 

 furnished with a small uniarticulate outer ramus bearing a few apical 

 setae (pi. xi., fig. 3). 



Mandibles narrow, oblong, masticatory end obliquely truncated, and 

 armed with small teeth ; mandible palp small, the basal part furnished 

 with two setae at the extremity — one being stout and spiniform, and one 

 plumose — and a small uniarticulate branch bearing a few setae is 

 articulated to the distal half of the basal part (pi. xi., fig. 4). 



The second maxillipeds are stout, and armed with a moderately long 

 terminal claw (pi. x., fig, 18). 



The swimming feet resemble those of Canthocamptus palustris, but 

 differ in a few minor particulars, as shown by the drawings. In the first 

 pair, which are moderately stout, the first joint of the inner branches 

 reaches to slightly beyond the end of the outer branch, the next two 

 joints are short, but the end joint is rather longer than the other ; in the 

 outer branches the middle joint, which is slightly longer than the first or 

 third has a small spine on the inner distal angle ; all the three joints have 

 the usual marginal spines— one on each of the first and second joints, and 

 three spines and two setae on the lower half of the outer margin and end 

 of the third joint (pi. xi., fig. 5). 



In the second, third, and fourth pairs the inner branches are all shorter 

 than the outer. The middle joint of the second pair bears a single setae 

 on the inner distal angle j but the end joint, which is rather longer than 



*This gathering was onlj- partially examined at the time it was collected, and it has 

 not even yet been exhaustively dealt with. 

 fCf. Ann. and Mag. Nat. Hist, for March, 1905, p. 284. 



