SOHTZOPODA, STOMATOPODA, AND NON-ANTAECTIC ISOPODA. 869 



Family MysiD/E, Dana. 



Sub-family boreomysin^, Holt and Tattersall. 



Genus Boreomysis, G. 0. Sars. 



Boreomysis distinguenda, Hansen, 



B. seyphops, G. 0. Sars, 1885a. 

 B. distinguenda, Hansen, 1908a. 

 nee. B. scyphops, G. 0. Sars, 1885&. 



Scotia. 



Station 301, lat. 64° 48' S., long. 44° 26' W., Weddell Sea, 2485 fathoms, 

 trawl. — One female, 30 mm. 



Hansen, in describing the Crustacea collected by the /n(70^ Expedition in northern 

 seas, took the opportunity afforded by the capture of large numbers of the true 

 B. scyphops to separate the present southern species from its northern ally, with which 

 it had been confused by Sars. The distinguishing characters are to be found in the 

 shape of the eye and of the antennal scale. No full description of B. distinguenda has 

 yet appeared, but it is not possible to draw one up from the present specimen, which, 

 besides being only about half-grown, is in a very poor state of preservation. Suffice it 

 to say that, in respect of the eyes and antennal scale, its characters are in agreement 

 with those given by Hansen for distinguishing B. distinguenda from B. scyphops. 

 Until Hansen separated the two species, the latter was the last surviving instance 

 of a bipolar Schizopod. Now there is no species common to the Arctic and Antarctic 

 Oceans, though several genera are recognised as occurring at both Poles. 



Boreomysis Brucei, sp. nov. (Plate, figs. 11-13.) 

 Scotia. 



Station 414, lat. 71° 50' S., long. 23° 30' W., Weddell Sea, 2102 fathoms, 

 vertical net, 0-1000 fathoms. — One immature male, 25 mm. 



Station 416, lat. 71° 22' S., long. 18° 15' W., Weddell Sea, 2370 fathoms, 

 trawl. — One immature male, 28 mm. 



Specific Characters. — The frontal or rostral plate (Plate, fig. 11) is produced 

 almost to the anterior level of the eyes. The lateral margins are slightly convex, and 

 meet in an angle of less than a right angle, while the apex is produced into a short acute 

 spine. The eyes are moderately large, broader than deep, with the pigment very pale 

 brown. The eye-stalks have the distal tubercle well developed. 



The antennular peduncle exhibits a light oblique ridge on the dorsal surface of 

 the basal joint, and has the second joint narrow, but much deeper dorso-ventrally than 

 either the first or third joints, so that it is almost circular in section. 



