74 DISCOVERY REPORTS 



Remarks. The collection of specimens agreeing exactly with Pfeffer's description and 

 figures, and from the same locality, is welcome, as it enables one to vindicate Pfeffer's 

 specific name, and the systematic position assigned to it by Stebbing in 1906, as well as 

 to describe the only two important structural details which Pfeffer omitted to mention. 

 Shoemaker has already reported the species (under the name Waldeckia zschauii) from 

 the Bay of Isles, South Georgia, but beyond clearly stating that the specimens agreed 

 with Pfeffer's species and not with Chevreux's obesa, he did not further discuss it. 



The epistome is distally gibbous, as in Stebbing's figure of that of cavimanus (1888, 

 pi. xxii). One of the distinctions between Orchomenella and Orchomenopsis therefore 

 breaks down. 



The 2nd antennae are elongate in the $ as described by Pfeffer. 



The finger of gnathopod 2, though overlooked by Pfeffer amongst the thick terminal 

 brush of setae, is present ; it is rather small and impinges against the slightly projecting 

 lower distal corner of the 6th joint, as it does in cavimanus; there is also an indication of 

 the little projecting process or platform figured by Schellenberg (1926, fig. 25 b) for the 

 same species, but not so prominent. 



This raises the question whether cavimanus should not be considered synonymous, as 

 Stebbing himself thought in 1906. Schellenberg, however, maintains cavimanus as 

 distinct, and in my opinion he is undoubtedly right. The peculiar shape of the dorsal 

 profile of pleon segment 4 is quite distinctive and constant. A glance at the figures of the 

 two species here given will show that there is no possibility of confusion. In cavimanus 

 the highest point of the keel is vertically above the posterior margin of the segment, 

 whereas in zschauii it is much more forward. 



As Schellenberg (1926) remarks for cavimanus, there is a tendency for the branchial 

 lamellae to develop transverse pleats. A single accessory branchia is found on both 

 segments 5 and 6. 



The telson is cleft nearly to the base and the lobes though parallel are separated by a 

 narrow space, as in Pfeffer's figure ; each lobe has a terminal spinule and two lateral spines. 



Distribution. South Georgia. The specimens from Coats Land recorded by 

 Chilton as Waldeckia zschauii are not this species but W. obesa. 



Genus Pseudorchomene, Schell. 

 Schellenberg, 1926, p. 295. 



Distinguished by the slender 1st gnathopod. 



Pseudorchomene coatsi (Chilton). 



Chilton, 1912, p. 477, pi. i, figs. 8, 9 (Orchomenopsis ?). 

 Schellenberg, 1926, p. 295. 



Occurrence: 1. St. 41. South Georgia. 1 $ 9 mm., 2 $$ (1 ovig.) 13 mm. 



2. St. 42. South Georgia. 3 ovig. $$ 12-14 mm. 



3. St. 45. South Georgia. 1 $ 11 mm., 1 $ 13 mm. 



4. St. 142. South Georgia. 2 <$<$ 10-11 mm., 1 ovig. $ 13 mm., 7 juv. 5-8 mm. 



5. St. 154. South Georgia. 1 $ 10 mm. 



