﻿CRU.STACIvA MALACOSTRACA. 103 



character of ArctoDiysis tliu.s falls to the ground; the species of Kroyer and Sars are identical, which 

 lias also been accepted by Sars himself and by several other observers. 



9. Boreomysis microps G. O. vSans. 



1883. Boreoiiu'sis microps O. O. vSars, Forh. Vid. Selsk. Cliristiania for 1883, No. 7, ]>. 35. 

 1885. — — (t. O. vSar.s, Challenger Rep., Zool, Vol. XIII, p. 185, PI. XXXIII, figs. 7—10. 



! 1905. — snbpellncida H. J. Hansen, Hull. i\Ins. Ocean. Monaco, No. 30, p. 8, figs. 5—8. 



Occnrrence. The "Iiigolf has not found this species but it was taken bv the ''Thor" in 1904 

 at the following localities. 



West of Iceland: 65° cxV N. L., 28"^ 10' W. L,., 1240 m., Yonng-fish trawl, kxxj 111. wire out; main- spec. 



- - — 65° 20' - 



- - - 65-27' - 

 South of — 61^ 34' - 



- - - 61° 30' - 



- - - 62° 47' - 

 South-West of the P'teroes: 61° 08' N. L,., 9" 28' W. L., 820 m., Young-fish trawl, at bottom; i spec. 

 Distribution. The species was founded on a si^ecimen taken south of Nova Scotia: 62'" 8' N. L., 



63^ 39' W. L., 1250 fill. The "Thor" has taken it 3 times in the waters west of the Hebrides with the 

 )-oiing-fish trawl, 1500 meters wire out. It was next taken to the west of Ireland in townets from 

 1150 to o fill. (Holt iS: Tattersall), also at several places south of the Azores in the \'ertical net sunk 

 to 1640 — 1770 fill., once to 820 fm. (Hansen). The species thus iK-longs t(.) the mesoplankton and as a 

 rule is scarcely met with before ca. 200 fin. down, but how deej) it penetrates is naturall\' unkmtwn. 



Reniark.s. In my paper cited, I founded a new species B. subprlhicida, as the numerous 

 specimens I had differed considerabh' from Sar.s' descriptions and figures in s<.)nie characteristics. Thus 

 Sars has neither mentioned nor figured the very distinct process on the upper side of the eye-stalks 

 close behind the cornea, also the pro.ximal part of the telsoii is considerably narrower in relation to 

 its length than in my specimeiLS. Later Mr. Holt e.xamined Sar.s' type preserved in the British Museum 

 and writes (in 1906): "The fact is that in so far as the diagnosis of />'. microps differs from that of B. 

 stibprllitcidd. the former is erroneou.s"; consequently he withdraws />. siibpfllucida as a synonym to />'. 

 microps. My own exaiiiinati(_)n of .Sars' type in 1906 gave the same result. 



A large female with marsupium (from 65° N. L.) measures 21J mm. from tij) of rostruin to end 

 of telson; a male from Gi'^N. L. is 19-5 mm. long. 



10. Longithorax fuscus 11. sp. 



PI. V. fi{{s. I a— I o. 



Description of the Ceiiu.s. As the descri])ticin of the genus is founded on a single soiuewliat 

 damaged female, in which the marsupium is imt full\- develojjed, this diagnosis is not (piite eouiplele'. 



I I had e.stablished a new Kiiiiis cm lln- picseiil form I)ffore Dr. G. \\\\^^9. jirfUmiiiarv note on the ••Valdivia" My.si- 

 dai-e.-i was pnl)lished. Coiise(|uentlv I aree]ited the uriKTic name l.oiii;itliontx proposed by him for an alHcd species, but I did 

 not alter anythinti in the deseriplions of tlie neiitis or the speeies. 



