64 CRUSTACEA MALACOSTRACA. IV. 



on third and fourth parts of legs agree perfectly with Bonnier. But the differences in various minor features 

 ought to be pointed out. 



i) Bonnier does not mention or figure any spine on the upper surface of the free thoracic segments, 

 and he stated that the abdominal segments are "inermes"; in my two largest specimens the last thoracic 

 segment has a single median dorsal denticle, and some small denticles are perceived on the upper side of the 

 three, especially of the two, anterior abdominal segments. 2) On the distal joints in first pair of legs Bonnier 

 says: "le dactylopodite, un peu plus long que le propodite", and this agrees with his fig. 2 m, but in the single 

 leg preserved in my specimens the dactylus, measured by micrometer, is a little shorter than the propodus; 

 it may be added that in Sars' Account the dactylus in the forms belonging to this family is never longer and 

 most frequently distinctly or considerably shorter than the propodus, and therefore I suppose that Bonnier's 

 statement is due to a casual variation or anomaly in his specimen. 3) In one of my specimens the telson has 

 some minute teeth on the proximal third of the lateral margin, but in the other specimen such teeth are 

 scarcely discernible; in Bonnier's figure the telson has no lateral teeth. 4) Finally the French author says 

 that the peduncle of the uropods has 7 spines on the distal half of the inner margin, but in a specimen I found 

 on that margin 13 or 14 small spines some of spines are lost, but their places of insertion distinct; (the rami 

 are unfortunately mutilated or lost in my specimens). - - The differences pointed out between Bonnier's 

 representation and my animals are scarcely of specific value, but only variation. 



Occurrence. Not taken by the "Ingolf", but by the "Thor" at a single station. 



South-West of the Faeroes: Lat. 6ii5' N., Long. 935' W., 463 515 fath. ; 3 specimens. 



Distribution. The type was taken in the Bay of Biscay: Lat. 4436' N., Long. 425' W., 345 

 fath. (Bonnier). 



57. Diastylis armata Norman. 



1879. Diastylis armata Norman, Ann. Mag. Nat. Hist. Ser. 5, Vol. Ill, p. 64. 

 1913. armatus Stebbing, Das Tierreich, 39. Lief, p. 95. 



Of this evidently rather characteristic species only the type specimen is known. 

 Occurrence. The single specimen was taken by the "Valorous" at the entrance of Davis Strait, 

 Lat. 59io' N., Long. 5o25' W., 1750 fath. (Norman). 



Makrocylindrus Stebbing. 



This genus was established in 1912, and M. fragilis Stebb. from off Cape Natal may be con- 

 sidered the generic type. The only distinctive character between Makrocylindrus and some species of Diastylis 

 is that the telson has no lateral spines on the narrow and rather short distal part, but only the normal two 

 apical spines. From Stebbing's representation of M. fragilis Zimmer points out another and more important 

 generic character, viz. the remarkable reduction of the basal fan of second maxillipeds in adult females, 

 but at present it is, as Zimmer says, not known whether this reduction is found in females of the other forms 

 referred by Stebbing to this genus. 



