l6 CRUSTACEA MALACOSTRACA. II. 



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

 and 2 on the upper; seventh joint with three denticnlations below. -- Seventh pair of legs (fig. 46) 

 very 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. 



Abdomen (fig. 4-b) not quite as long as the sum of the four ^posterior thoracic segments, very 

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

 the postero-lateral angles very 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 lamellae very small, 14 mm. 



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

 or less importance. But some characters, viz. the considerably longer inner flagellum of the antennulae, 

 the extreme slenderness of the chelipeds, no serration or setigerous 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 "Thor" at the following locality. 



South of Iceland: Lat. 62 57' N., Long. 19 58' W., 505 fm.; 13 specimens, all mutilated or in 



fragments. 



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

 Five species have been established, three of which are represented in our material. 



6. Sphyrapus anomalus G. O. Sars. 



1869. Apsmdcs anomalus G. O. Sars, Nyt Mag. for Naturv. B. XVI, p. 439. 



1881. Sphyrapus , Arch, for Math, og Naturv. B. 7, p. 19. 



1886. Norman & Stebbing, Trans. Zool. Soc. London, Vol. XII, Pt. IV, p. 101, 



PI. XXI, fig. II. 

 ! 1896. G. O. Sars, 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. scrratus G. O. S. The most conspicuous and perhaps also the most valuable 

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

 serratus these epimera are, seen from above, very outstanding, obliquely triangular, acute bnt not 

 acuminate, constituting a real saw; in S. anoinah(s they were described by 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 "Ingolf" St. 4 

 the epimera are visible from above, but much smaller than in S. se.rratus, 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. anomalus the fifth joint of second pair of legs has only two strong spines on 



