Revision of the Amphipoda from South Georgia. 6l 
think it may be different. Personally, however, I consider it only a 
particularly large form of Jassa falcata, the differences in the gnathopod 
being, as it were, mechanical adaptions associated with its exceptional 
size. Numerous instances are now known among the Amphipoda where 
large and old males develop in those appendages which differ in the two 
sexes characters which differ considerably not only form the female form 
but also from the ordinary male form; this appears to be the case, for 
instance, in. Cerapus abditus R. TEMPLETON (= (. flindersi STEBBING). 
In the Soutan Georgia specimens and also in those collected by tlıe 
„Scotia“ from South Orkneys both forms of the male occur and while 
this tends to confirm the fact that the Subantarctie forms really belong 
to Jassa falcata it also goes to show that Mrs. SEXTON is right in con- 
sidering it a species with dimorphic males and that it is not a question 
of two separate species being confused under one name. 
? Atyloides serraticauda (Stebbing). 
A. serraticauda STEBBING 1906, p. 362. 
h 3 CHEVREUX 1906, p. 87. 
+ Br CHILTON 1912, p. 497. 
? Schraderia gracilis PFEFFER 1SSS, p. 141, pl. 2, fig. 5 (no description, only one figure). 
This species was mentioned but not deseribed by PFEFFER, who 
gave only a figure of the whole animal. From this figure alone it is 
impossible to recognise the species in a family where there are so many 
almost identical in general appearance and distinguishable only by a de- 
tailed examination of the separate appendages. The actual specimen 
from which PFEFFER’s figure was made cannot now be ascertained but 
specimens in the collections of the Hamburg Museum labelled „Schraderia 
gracilıs“ prove to be the same as Atyloides serraticauda STEBBING. 
This species is very widely distributed in Antarctie and Subant- 
arctic seas. 
| Caprellinoides mayeri (Pfeffer). 
Caprellina mayeri PFEFFER 1885, p. 157, pl. 3, fig. 4. 
Caprellinoides mayeri MAYER 1890, p. 88, pl. 5. fig. 57—58, pl. 6, fig. 15 aud 26, pl. 7, 
fig. 48. 
In 1890 MAYER placed this species under the genus Caprellinoides 
pointing out that it cannot come under Caprellina as it has no branchiae 
on the second segment. In many respects it seems close to ©. tristanensis 
STEBBING from „off Nightingale Island, Tristan da Cunha“, but as only 
the female of that species is known MAYER was unable to decide definit- 
ely whether the two were identical or not. No specimens of this species 
were taken by the „Scotia“. 7 
