l6 CRUvSTACEA MALACOSTRACA. II. 



ill the largest specimen witli 7, in somewhat smaller specimens with 6 spines on the lower margin 

 and 2 on the upper; seventh joint with three denticulations below. — vSeventh pair of legs (fig. 4e) 

 \-ery slender; second joint about five and a half times as long as broad; sixth joint has on the distal 

 half of the inner margin a row of small spines; seventh joint even slightly longer than the .sixth; 

 the claw more than two-thirds as long as seventh joint. 



x^bdomen (fig. 4 b) not quite as long as the sum of the four posterior thoracic segments, ver\' 

 slender. The five anterior segments with conspicuous, slender processes below, and the processes from 

 the postero-lateral angles ver\- short and slender. Sixth segment as long as the three preceding 

 segments combined, even a little more than four times as long as broad at the middle, without 

 tubercles and lateral setae. 



Length of the largest specimens, with the marsupial lamellee very small, 14111111. 



Remarks. This species differs from A. gracilis Norm. & Stebb. in several features of more 

 or less importance. But some cliaracters, viz. the con.siderably longer inner flagellum of the antennulse, 

 the extreme slenderness of the cheliiDeds, no serration or setigerons area on the fixed finger of the 

 chela, finally the oblong fifth joint of second pair of legs show, according to my judgment, that the 

 form must be considered a separate species. 



Occurrence. Only taken by the "Tlior" at the following locality. 



vSouth of Iceland: Lat. 62° 57' N., Long. i9"'58'W., 505 fm.; 13 specimens, all mutilated or in 



fragments. 



SphyrapUS Norman, M. S., G. O. Sars. 

 Five species ha\'e been established, three of which are represented in our material. 



6. Sphyrapus anomalus G. O. Sars. 



1869. Apsnidrs n/wu/alns G. O. Sars, X\t Mag. for Natur\'. B. XVI, p. 439. 



1881. Spliyrapus — — , Arch, for Math, og Natnrv. B. 7, p. 19. 



1886. - — Norman & Stebbing, Trans. Zool. Soc. London, Vol. XII, Pt. IV, p. loi, 



PI. XXI, fig. II. 

 ! 1896. — — G. O. Sans, Account Crust. Norway, Vol. II, p. 9; Pis. Ill— IV. 



This species, which has been excellently figured and described by G. O. Sars, is closely allied 

 to the next form, .S'. srrrattts G. O. S. The most conspicuous and perhaf)s also the most valuable 

 difference between them is the shape of the "epimera" of the five anterior abdominal segments; in S. 

 scrniftis these epimera are, seen from above, very outstanding, obliquely triangular, acute but not 

 acuminate, constituting a real saw; in ^S'. aiioinaliis they were described b}' Sars as "not at all pro- 

 duced" and drawn as scarcely or not visible from above, which agrees well with their shape in the 

 males, but often not completely with their shape in the females. In the female from "Iiigolf" St. 4 

 the ejiimera are visible from above, but much smaller than in .S'. srrratiis. with the freely outstanding 

 part rather narrow, acuminate and acute, and in several other females the epimera, seen obliquely 

 from above and somewhat from the side, are a little produced, acute, but directed mainly downwards. 

 In all specimens of S. tii/oi/ial/is tlie fifth joint of second pair of legs has onl\- two strong spines on 



