CRUSTACEA MALACOSTRACA. IV. 65 



< )ur knowledge of the 3 or 4 European species of Makrocylindrus, viz. M . serricauda Th. Seott, M . 

 dubius Bonn., M. Josephines G. O. S. (and M . erinaceus G. O. S.), together with Didstylis longicaudata Bonn., 

 D. longipes G. O. S., D. costata Bonn, and /). armata Norm, is insufficient. These animals, which all have the 

 thick part of the telson long and cylindrical, the narrow part rather short with three pairs of lateral spines 

 or without spines, are not common, their integument is fragile and consequently damaged, they are more or 

 less spiniferous, and this armature shows some variation; adult females have not been dissected and adult 

 males are unknown. Under these circumstances it is sometimes not possible to refer specimens with certainty 

 to species already described, or in even' case to establish an absolutely valid new species, and the reference 

 of species to a genus as Makrocylindrus must be provisional, as its diagnosis ought to be revised. 



The material from our area comprises one of the species referred by Stebbing to Makrocylindrus, 

 and besides a few specimens of a species which may be considered as new ; this new species differs materially 

 from Stebbing's diagnosis of the genus in possessing 3 pairs of dorsal spines on the distal part of telson, 

 but as it in the shape of the carapace, the uropods, etc. seems to be related to the South African M. fragilis, 

 it is provisionally referred to the present genus. 



58. Makrocylindrus Josephinae G. O. Sars. 

 1871. Diastylis Josephines G. O. Sars, Ofv. Kgl. Sv. Vet.-Akad. Forh. Arg. $j, p. yy. 

 11871. 0. (). Sars, Kgl. Sv. Vet.-Akad. Handl. Ny Foljd, Bd. 9, no. 13, p. 36, Tail. XV, 



Fig. 72—74. 

 1905. Caiman, Fisheries, Ireland, Sci. Invest., 1904, I, p. 44. 



1913. Makrocylindrus JosephincB Stebbing, Das Tierreich, 39. Lief. p. 120. 



< )l this species I have examined 3 specimens, one from the "Ingolf" area, the others from more southern 

 localities. In two females without marsupium somewhat more than the proximal half of the thick part of 

 telson is serrated on the sides, in a female with marsupium half developed the saw-teeth on the sides are 

 very small ; in all three specimens the narrow part of the telson is completely smooth, while about the proximal 

 half of the thick part is serrated in the ventral median line. : — Caiman (1. c.) mentions variation according 

 to age in uropods and telson ; on the uropods I can say nothing, but his remarks on the telson may possibly 

 indicate that he, as suggested by Stebbing, did not separate it from M . serricauda Th. Scott. 



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



South-West of the Faeroes: Fat. 6i°i5' N., Long. 9°35' W., 463 — 515 fath. ; 1 specimen (imm. ,). 



Distribution. Norman (1879) recorded it from Fat. 67°7' N., Long. 521' W., 500 fath., a station 

 near the polar circle in the cold area, wherefore I suppose that there is a misprint in the latitude 67 instead 

 of 6o°N., and this would agree better with the other stations from the "Lightning"- Fxpedition. The same 

 author recorded it from the sea in the triangle: the Faeroes — Shetland — the Hebrides, 344 to 542 fath., and 

 from a point far south-west of Ireland, 725 fath. ; the "Thor" captured a specimen not far from the last-named 

 place, 674 — 624 fath. (Stephensen). Caiman records it from west of Ireland, 199 to 454 fath., in 1910 from 

 three places in the southern part of the Bay of Biscay and from one place south-west of Fissabon, depths 

 from 196 to 718 fath. ; Sars' type was taken south-west of Fissabon at Fat. 38 m 1 .,' N., Long. 9°25' W., 750 fath. 



The Ingolf Expedition 111. 6. ,, 



