DR. W. M. TATTEUSALL : AMPHIPODA AND ISOPODA. 11 
I have figured the distal joints of the second guathopods of all four speci- 
mens. The second gnathopods of the female agree very fairly well with 
those figured for E. afer by Stebbing (IBS):?), for E. zeylanicus by Walker 
(1904), and for E. gardineri by Walker (1905). Those of the smaller 
immature male resemble the figures given by Stebbing for the type-specimen 
(a female) from Cape Verde (1888, pi. 114, gn. 2) oE E. atkudiciis, by 
Walker for the young male of E. zeylanicus (1904, pi. 6. fig. 41, gn. '/^ 
(J jr.), and by Walker for the young male of E. gardineri (1905, pi. 88. 
tig. 14). 
The second gnathopods of the larger of the immature males agree closely 
with those figured for the adult male of E. zeylanicus by AValker (1904, pi. 6. 
fig- 41, gn. 2, cj), and is not unlike the figures given b}' Stebbing foi- the 
adult male of E. atlanticus (1908 (l),pl. 40B). Stebbing's specimen had, 
however, lageniform eyes. 
The second gnatliopods of the adult male are not quite like tiiose figured 
for any of the species of Eurystlieus, but seear to be the adult condition of 
the immature males in this collection. I feel convinced that the four 
sjpecimens here dealt with belong to one species. They were all collected 
at the same time in the same place, and appear to me to represent 
the adult female and three stages of growth in the male. From this 
it follows that the lageniform shape of the eyes is an adult character 
only, or, alternatively, a character which varies greatly. I feel sure, too, 
that my specimens belong to the same species as E. seylcmicus. Walker, and 
E. gardineri, Walker. Neither of these species has lageniform eyes, but 
judging from my specimens, most of Walker's specimens were immature. 
Walker himself in 1909 united these two species, and in a footnote to the 
same paper expresses the opinion that both are synonymous with E. atlanticus, 
Stebbing. In accepting that verdict, it is necessary to point out that the type 
of E. atlanticus is a female which has the lageniform eyes of the adult and 
second gnathopods of the form ascribed here to an immature male with oval 
eyes. Both Chilton 1912 (2) and Barnard (1916) have suggested the possi- 
bility of E. atlanticus being the same as E. afer (Stebbing), and support is 
given to that idea by the close resemblance of the second gnatliopods of the 
adult female in the present collection io those figured by Stebbing for jB. afer, 
female. But the latter species has long ovaL eyes, not lageniform in shape, 
(ihilton's specimens, identified with doubt as E. afer, seem to have gnathopods 
altogether longer and more slender than in the present specimens. 
It will be seen that there has been considerable difficulty in arriving at a 
conclusion with regard to the identity of these specimens. I can best sum 
up the evidence yielded by them, by saying that they are certainly the 
same as E. zeylanicus and E. gardineri of Walker, and that I accept his 
opinion that these species are synonymous with E. atlanticus, Stebbing, a 
widely distributed and apparently very variable species. 
