. The annals and magazine of natural history : zoology, botany, and geology. elton. Length about 2 mm. ]\I. Clievreux gives several small points in which S. ar-mata appears to differ from S. Saundersii, such as the shapeof the side-plate of the first segment of pereion, the relativelengths of the different joints of the antennae, and of thepeduncles and rami of tiie uropoda &c. After carefullycomparing the figures and descriptions given by M. Clievreuxand Mr. Stebbing with regard to these points, and afterobserving them in my specimens and in those of S. Saundersiisent by Mr. Walker, I must co
. The annals and magazine of natural history : zoology, botany, and geology. elton. Length about 2 mm. ]\I. Clievreux gives several small points in which S. ar-mata appears to differ from S. Saundersii, such as the shapeof the side-plate of the first segment of pereion, the relativelengths of the different joints of the antennae, and of thepeduncles and rami of tiie uropoda &c. After carefullycomparing the figures and descriptions given by M. Clievreuxand Mr. Stebbing with regard to these points, and afterobserving them in my specimens and in those of S. Saundersiisent by Mr. Walker, I must confess that 1 have little con- New Zealand Awphipod. 573 fidcnce in any of tliese diflfeiences as good specific cliaractcr.^,and consider that the distinction must be made principallyby the cliaiacters of the first gnathopod of the male (.-eefi;j;ure). For the sake of comparison, however, I ^ive here afewjiointsin which my (male) specimens appear to differ fromthe other species, it being understood that in the charactersnot mentioned there is no appreciable Seba ti/pica: first gnathopod of male (highly magnified). In the antenna the second joint of the peduncle is moreslender than the first and is equal to it in length or only veryslightly longer; the lower antenna is hardly, if at all, shorterthan the upi)er; in all the pereiopoda the meros is more orless produced alongside tlie carpus; in the first pereiopodthis projection reaches about to the middle of the carpus, inthe last j)ereiopod it reaches slightly beyond the distal end ofthe carpus, the intervening pereiopoda showing intermediatestages; the first uropod has the peduncle a little shorterthan that of the second, the outer branch is longer thanthe peduncle and about two thirds the length of the innerbranch ; in the second uropods the branches are specimens are about the same size as S. armata^ butconsiderably smaller than S. Saundcrsii. 571 Mr. W. K. Fisher on the LXXV.— On the Generic Name Sto
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