494 PROFESSOR CHARLES CHILTON ON THE 
This agrees well with the descriptions given by PFEFFER and CHEVREUX, except that 
the third uropod does not extend much beyond the others. In the upper antennez 
every second joint of the flagellum is slightly expanded below and bears sensory sete, 
thus having somewhat the appearance of the flagellum in Paramera austrina ; in this 
character the antennz agree exactly with the original description given by PFEFFER. 
I have been able to compare my specimen with those in the Hamburg Museum 
originally described from South Georgia by Dr Prerrer, and thus to confirm the 
identification. 
M. CuevreEvx records the species from Booth Wandel Island. 
Genus Bovatiia Pfeffer, 1888. 
Bovallia monoculoides (Haswell). 
Atylus monoculoides Haswell, 1880, p. 327, pl. xviii. fig. 4. 
Bovallia gigantea Pfeffer, 1888, p. 96, pl. i. fig. 5. 
Chevreux, 1906z, p. 54, figs. 31-33. 
PA »  Stebbing, 1906, p. 357. 
Eusiroides monoculoides Stebbing, 1906, p. 345, and 1910a, p. 595. 
5 is Chevreux, 1908, p. 475. 
# erasst Stebbing, 1906, p. 346, and 19104, p. 594. 
cesaris Stebbing, var. Walker, 1904, p. 264, pl. iv. fig. 22. 
Bovallia monoculoides Chilton, 1909a, p. 622. 
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Several specimens from shore pools and moderate depths at South Orkneys, 
Scotia Bay, Station 325. Largest specimen 37 mm. long. 
These specimens agree well with the descriptions of Bovallia gigantea given by 
PFEFFER and CHEvREUX. ‘They have the last sesment of the pereeon and the first two 
segments of the pleon carinate and produced into an acute dorsal tooth; the third 
segment of the pleon bearing a blunt tooth. In smaller specimens these teeth are less 
marked. They thus agree also with the description originally given by Sressrne for 
Husiroides cxesaris, but they differ from it in having the posterior margin of the third 
segment of the pleon slightly convex and without serrations. The accessory flagellum 
of the first antenna is present, but is small, and appears to be united with the third 
joint of the peduncle much in the same way as I have described for the specimens of 
Atylus megalophthalmus Haswell, which are now considered to be a form of the widely 
spread Paramera austrina (Bate). 
Through the kindness of the authorities of the Hamburg Natural History Museum, 
I have been able to examine co-types of Bovallia gigantea Pfeffer from South Georgia. 
These are larger than the largest Scotia specimens, and the dorsal teeth are slightly less 
acute, but there is no difference of any importance. That the dorsal teeth are subject 
to considerable variation was already known from their varying development in the 
three species of Husiroides originally described by Stespinc. Two of these, H. cesaris 
and EL. pompen, were united by Stepsinc in the Das Tierreich Amphipoda, and 
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