2U "TERRA NOVA" EXPEDITION. 



The second thoracic limbs (pi. IV, fig. 12) have one spine on the fourth joint, one 

 on the fifth, and two on the sixth. 



The telson (pi. IV, fig. 14) is broadly triangular, with the apex rounded. The 

 distal half of the margins is serrate, the serrations at first regular but becoming uneven 

 towards the apex, and there is a fringe of small plumose setae between the serrations. 

 The uropods are about as long as the telson. Both rami have margins coarsely serrate 

 or toothed, and in my figure I have indicated the spinules which still remain in my 

 specimen. 



In comparing my specimen with Dana's description and figures the following 

 differences may be noted : — 



(1) The first free thoracic somite in my specimen, while longer than the 

 succeeding ones, is not so disproportionately long as Dana shows. 



(2) The eyes are larger in my specimen, and the distance between them 

 correspondingly smaller than Dana's figure illustrates. 



(3) The flagellum of the antennules is nine-jointed according to Dana, and 

 thirteen-jointed in my specimen. 



(4) The antennae in my specimen have the last joint of the peduncle rather 

 longer and narrower than Dana figures it, while the fiagellum has sixteen to 

 eighteen joints as against twenty-two given by Dana. 



(5) Dana's description and figures of the telson in his species suggest that it 

 is longer and more truncate than in my specimen. He gives no detail of the 

 armature of either telson or uropods. 



The general resemblance between my specimen and Dana's description is sufficiently 

 close to warrant its being referred to Dana's species, at any rate until more material is 

 forthcoming. 



Sub-family CYMOTHOINAE. 



Genus CERATOTHOA, Dana. 



20. Ceratothoa impressa (Say). 



Glossohius linearis, Schioedte and Meinerfc, 1881-83, p. 301, tab. XII, figs. 1,2. 

 Ceratothoa impressa, Richardson, 1905, p. 234, text-figs. 236-240 (with full synonymy). 



Occurrence. — 12.5.1913, from the branchial chamber of allying ^&h., Exocoetus, 

 which flew on board the "Terra Nova"; one female, 38 mm., one male, 11 mm. 

 From the list of stations, it would appear that on this date the " Terra Nova " was 

 in about 5° S., 27° 15' W., in the Tropical Atlantic. 



21. Larval Cymothokl, gen. et sp. (?). 



Occurrence. — Station 133, Spirits Bay, near North Cape, New Zealand, plankton, 

 one specimen. 



