36 W. M. TATTERSALL. 



I became aware, only after the plates illustrating this report had been printed, 

 that the two specimens of Antarctomysis in the ' Discovery ' collections, referred in the 

 preliminary note to one species A. maxima, in reality belong to two distinct but very 

 closely allied species. On my appealing to Dr. Hansen, he very kindly sent me some 

 notes and sketches of A. maxima, and a second species of the genus discovered by him 

 in a collection which he is engaged in working out. These notes and drawings placed 

 the matter beyond doubt, the larger of my two specimens clearly belonging to Hansen's 

 second species. I note the species here, and give the points of distinction, but leave a 

 full description and name to Dr. Hansen. The drawing on PL VIII. , Fig. 1, was taken 

 from the real A. maxima, but the remaining figures on the plate represent the 

 appendages of the second species, which, at the time, I took to be A. maxima also. 

 They will probably be of use, however, in illustrating how closely allied the two species 

 are when they are compared with the figures given by Coutiere (1906) of the true 

 A. maxima. 



ANTARCTOMYSIS MAXIMA. 



(PL VIIL, Fig. 1.) 



Mysis maxima (j>ars), Holt and Tattersall, 1906 (1). 

 Antarctomysis maxima, Coutiere, 1006. 



Locality of capture. Winter quarters, 5. 6. 02, D-net hole, 56 fathoms, one 

 specimen, immature male, 33 mm. 



Coutiere (1906) has recently described this species in great detail from mature 

 examples collected by the French Antarctic Expedition. I have practically nothing to 

 add to his description, but since no figure of the entire animal was given by him, my 

 drawing on PL VIII., Fig. 1 may be useful. 



Coutiere does not mention the spines arming the inner ventral edge of the inner 

 uropod. They extend from the posterior inner corner of the otocyst to the extreme 

 tip of the uropod, and posteriorly, at least, are arranged in series of twos, threes and 

 occasionally fours. The species would appear to be circumpolar in distribution, since, 

 besides the single specimen in the ' Discovery ' collection, it has been taken by the 

 French, Swedish and Belgian Antarctic expeditions ; by the two former, in considerable 

 numbers. 



ANTARCTOMYSIS sp. 

 (PL VIIL, Figs. 2-12.) 

 Mysis maxima (pars), Holt and Tattersall, 1906 (1). 



Locality of capture : Lat. 78 25' 40" S., long. 185 39' 6" K, 300 fathoms, one 

 specimen, immature male, 40 mm. 



This species is so closely allied to A. maxima that I only became aware that it 

 was distinct when too late to properly illustrate it. The figures 2-12 on Plate VIIL 

 were taken from the appendages of this specimen. 



