﻿j6 CRUSTACEA MALACOSTRACA. II. 



ill tlie largest specimen witli 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. 4e) 

 very slender; second joint about fi\-e 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 si.xth; 

 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 verv short and slender. ,Si.xth 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 sette. 



Length of the largest specimens, with the marsupial lamcllse very small, 14 mm. 



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

 or less imjijortance. But some characters, viz. the con.siderably longer inner flagellum of the antennulse, 

 the extreme slenderness of the chelipeds, no serration or setigerous area on the fixed finger of the 

 chela, fiiialh' the oblong fifth joint of second pair of legs show, according to my judgment, tlial 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 Xorman, M. S., G. O. Sars. 

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



6. Sphyrapus anomalus G. O. Sars. 



1869. Apsc?idrs anoi/ialns G. O. Sars, Nyt Mag. for Naturv. B. X\"I, p. 439. 



1881. Sp/iyrapiis — — , Arch, for Math, og Natur\-. P.. 7, p. 19. 



1886. - — Norman & Stebbing, Trans. Zool. Soc. London, \'ol. >:il, Pt. IV, \\ loi, 



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. A', scrrafiis 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 abo\e, very outstanding, obliquely triangular, acute but not 

 acuminate, constituting a real saw; in .S'. aiioiiabis the\ were described by Sars as "not at all pro- 

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

 males, but often not completeh- 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. serratus, 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 A', aiioiiiahis the fifth joint of second pair of legs has ouK- two strong spines on 



