of the Fishery Board for Scotland. 459 



The second maxillipeds resemble the same organs in Stenhelia hispida, 

 G. S. Brady (fig. 21). 



The first pair of thoracic feet are moderately stout, the inner branches 

 are about one and a half times the length of the outer branches, first 

 joint is equal to the entire length of the second and third, while the 

 second is equal to about two-thirds the length of the end joint ; the joints 

 of the outer branches are sub-equal (fig. 22). 



The remaining three pairs of feet do not differ very materially from 

 the same appendages of Stenhelia ima, except that they are scarcely so 

 elongated (fig. 23). 



The fifth pair is foliaceous, but comparatively short ; the secondary 

 joints do not extend much beyond the produced inner portion of the basal 

 joints, which in outline is broadly triangular, and furnished with three 

 setae of unequal length on the bluntly rounded apex, while two dagger- 

 like spines spring from the inner margins ; the secondary joints are also 

 somewhat triangular, but they are rather narrower than the produced 

 inner portion of the basal joints ; the apex of the secondary joints, which 

 is somewhat truncate, bears three small setae, and three small hairs 

 spring from the outer margin (fig. 24). 



Caudal furca slender, and about as long as the last abdominal segment 

 (fig. 25). 



Habitat. — The species occurred very sparingly in some washings of 

 dredged material from Station III., Firth of Forth (to the east of Inch- 

 keith), collected on June 7th, 1901. No males were observed. 



Remarks. — This species resembles Stenhelia hirsuta, I. C. Thompson, in 

 some respects, and especially in the structure of the antennules, and in 

 the length of the caudal furca ; but in that species the inner branches of 

 the first pair of thoracic feet are long and slender, much more so than the 

 present form. The two species diifer also in the form of the fifth pair. 

 And though the structure of the antennules of Stenhelia confusa bears a 

 certain resemblance to those of Stenhelia hirsuta, it differs very distinctly 

 in this as well as in some other respects from almost every other species 

 of the genus. 



Ameira tenuicornis, T. Scott (sp. n.). PI. XXIV., figs. 1-9. 



Description of the Female. — Length *67 mm. (about -^ of an inch). 

 Body moderately slender and sub-cylindrical ; rostrum small (fig. 1). 



Antennules slender and elongated, exceeding in length the cephalo- 

 thoracic segment, and composed of eight joints ; the first and second joints 

 are sub-equal ; the third and fourth are also sub-equal, but smaller than 

 the preceding joints (fig. 2). The approximate proportional lengths of 

 the various joints are shown by the formula. All the joints with the 

 exception of the first one are sparingly setiferous. 



Proportional lengths of the joints, . 24 . 25 . 18 . 15 . 10 . 9 . 6 . 9 



Number of the joints, 1. 2. 3. 4. 5.6.7.8 



The antennae are very slender, and the secondary branches are small 

 and two-jointed, the end joint being the smallest (fig. 3). 



The mandibles are of moderate size, narrow-cylindrical, and obliquely 

 truncate at the apex, which is armed with a few minute spinules ; the 

 basal portion of the mandible-palp is small but slightly dilated, and 

 carries two branches ; the marginal branch is small and one-jointed and 

 furnished with a few setae ; the end joint is long and very slender, and 

 is minutely serrated at the extremity (fig. 4). 



The second maxillipeds (posterior foot-jaws) are moderately stout and 

 armed with strong terminal claws (fig. 5). 



