SCHIZOPODA. 13 



smooth ; dorsal denticles in two pairs, the first situated at about two-thirds of the 

 distance from the base of the telson to the insertion of the sub-apical spines, second 

 pair just above the spines. 



Uropods sub-equal in length, rather slender, extending to the level of the 

 insertion of the sub-apical spines of the telson. 



Preanal spine small and simple. 



A fuller description of this species is not possible, since the single specimen is 

 in bad condition and dissection was not desirable. 



The species belongs to that group of the genus with a posterior median dorsal 

 spine on the third segment of the pleon, and is distinguished from the other members 

 of the group by having an equally developed spine on the fourth and fifth segments 

 of the pleon in addition. It presents no very near kinship with any described 

 species of the genus, and from the depth at which it was captured is probably a deep- 

 water form. 



EUPHAUSIA VALLENTINI. 



(Plate IV., Figs. 4-6.) 



Eupliausia splmidens (pars), G. 0. Sars, 1885. 



Euphausia vallentini, Stebbing, 1900. 



Euphausia vallentini, Holt and Tattersall, 1906 (1). 



Localities of captures :—Lsit. 56° 54' S., long. 170° 28' E., two specimens, male 

 and female, 19 mm. 



I have carefully compared these two specimens with two of the types from the 

 Falkland Islands which the Rev. T. Stebbing kindly sent me, giving me at the 

 same time full permission to dissect them if necessary. The ' Discovery ' specimens 

 are in perfect agreement with the types, and I have nothing to add to Stebbing's 

 description except a note on the copulatory organs on the first pleopod of the male. 



In the course of working out this collection the authorities of the British 

 Museum kindly allowed me to examine and dissect two of the ' Challenger ' specimens 

 labelled Euphausia splendens by Sars. They were from the second of. the localities 

 given by Sars on p. 82 of his " ' Challenger ' Report," viz., " October 21, 1875, South 

 Pacific." It became at once apparent on examination that one of these specimens 

 did not agree with Sars' description, since the antennule was furnished with a large 

 evenly rounded lappet on the basal joint, very conspicuous in lateral view.* Further 

 examination showed that it probably, indeed almost certainly, belongs to the present 

 species. It is true that I could not see the spine on the third pleon segment, but 

 the specimen is in very poor condition, and if, as I suspect to be the case, the 

 spine has been broken off", the scar would be difficult to detect. 

 , I give (Plate IV., Fig. 5) an outline sketch of the rostrum and the basal joint 



* Examination of the ' Challenger ' types of E. splendens shows that this species possesses a small 

 antennular lobe, but it is nothing like so well developed and conspicuous as in E. vallentini (see Hansen 

 (1905 (2) ), Holt and Tattersall (1906 (1), and below, p. 14.) 



VOL. IV. 



