SCHIZOPODA AND CUMACEA i3 



Length of an adult maie from the Swedish Expédition 27 mm., but the females are 

 smaller, even rarely reaching the length given by Holt & Tattersall, viz. 23 mm. 



Colour. — On the colour of the spécimen taken by the Belgica the following note was 

 made : « translucide incolore avec taches rougeâtres irrégulières. Estomac purpureus. » 



Locality. — Lat. 71 19' S., long. 87 37' AV., May 28, 1898, swab ; one spécimen. 



Distribution. — ■ The spécimen described by Holt & Tattersall was taken at lat. 

 78 25' 40' S., long. i65° 3g' 6' E. — I am inclined to think that Sars has seen a spécimen, which 

 he referred to P. Sarsii Will.-Suhm ; he writes (Challenger, p. igi) : « A single and much 

 larger, though rather mutilated spécimen, apparently of the same species was taken in the 



Antarctic Océan lat. 65° 42' S., long. 7g 4g' E.; depth 1675 fathoms. » Unfortunately this 



spécimen seems to be lost, as I hâve looked for it in vain in the British Muséum (Nat. Hist.). 



2. — Antarctomysis maxima (Hansen, MSS.), Holt & Tatt. 



PI. II. figs. 3a-3f»! 



1906. Mysis maxima Holt & Tattersall, Ann. Mag. Nat. Hist.. ser. 7, vol. XVII, p. 11. 



1906. Antarctomysis maxima Coutière, Expéd. antarct. Française, Crust. Schizop. et Décap , p. 1, figs. 1-20. 



The genus Antarctomysis established by Prof. Coutière is adopted hère, because it is 

 founded on structural features équivalent with those applied for subdividing into gênera the 

 large genus Mysis in the sensé adopted by G. O. Sars in his monograph of the Norwegian 

 Mysidae. Gradually the suborder Mysida has been divided into so many often very closely allied 

 gênera, that it would be useful to undertake a revision of the classification with the intention to 

 reduce a good number of the gênera to subgenera of various main gênera in order to get a better 

 view of the natural relationships of the species and gênera. The French author has given a 

 diagnosis of the new genus. 



The material from the Belgica comprises three female spécimens, two of which are large 

 while the third is less than half-grown. The Swedish Expédition has captured a good number of 

 both sexes of this species, and besides many spécimens of an other closely allied but sharply 

 defined species, for which I propose the name A. Ohlinii n. sp., in honour of Dr. A. Ohlin, the 

 late Swedish Zoologist who wrote several useful papers on arctic and Patagonian Malacostraca 

 and was the leading Zoologist of the Swedish antarctic Expédition. The main différences between 

 the two gigantic species shall be pointed out hère, but a more spécial treatment of A. Ohlinii 

 and of the maie of A. maxima must be postponed till the report of the last-named Expédition. 



Female of A. maxima. — The carapace is anteriorly somewhat produced into a 

 moderately short, triangular, acute rostral plate, the distal part of which is somewhat concave 

 and bent a little downwards (figs. 3a and 3 b). The front latéral margin of the carapace is 

 subvertical and 'a little concave (fig. 3 b) ; the last thoracic segment and the posterior dorsal part 

 of the penultimate segment are left uncovered by the carapace. The eye-stalks and eyes are 

 considerably depressed ; seen from above (fig. 3a) the eyes look essentially outwards, occupying 

 not only the front end but the major part of or nearly the whole outer margin of the stalk, so that 

 the inner margin of the stalk itself is much or several times longer than its outer free margin 



