6o 



CRUSTACEA MALACOSTRACA. 



I had noted it previously from the Davis Straits: 66° 32' N. L., 55 34' W. L., 100 fm., Th. Holm. 

 It was taken by the "Thor" to the south of Iceland at the following localities: 



63 46' N. L., 22° 56' W. L., 80 fm.; large number of specimens. 



63 15' — 22° 23' — 114— 173 fm.; 1 specimen. 



It has not been found at the Faeroes. 



Distribution. The species is noted by Norman from the Shetlands, Hebrides, Northumber- 

 land and Durham, from Firth of Clyde by Henderson; at Denmark it has twice been taken in the 

 Kattegat in 5 fm. and 23 fm. (given by Meinert as H. spinus) and has been found a number of times 

 in the Skager Rak in depths from 23 to 106 fm. According to G. O. Sars it is "very common on our 

 (Norway) south and west coasts in great depths"; he gives it also from two places in the sea west of 

 Finmark at 107 and 300 fm.; it is further found at East Fiumark (Norman) and in the most westerly 

 part of the south coast of the Murman Sea, in 94 to 159 fm. (Birula). Lastly, the species has been 

 taken a number of times on the east coast of North America from Nova Scotia to 37° N. L,., in 25 to 

 640 fm. (S. I. Smith, Mary Rathbun), also on the north side of Alaska at ca. 157V4 W. L. (M. Rathbun). 



Remarks. In 1863 Norman gave a detailed description with 7 figures of this species. He 

 concludes with the following words, which are cited here as the original description is rare in libraries: 

 "H. securifrons approaches more nearly to //. spinus (Sowerby) than to any other of our recognised 

 species. The latter may be more especially distinguished from the former; first, in having the dentated 

 keel continued to the hinder margin of the carapace; secondly, in the four posterior teeth being of 

 considerably greater size than the teeth anterior to them; thirdly, in the fact that the teeth in the 

 upper margin of the rostrum are themselves furnished with secondary teeth; and fourthly, in having 

 the dorsal centre of the third abdominal segment produced into a conspicuous tooth-like process". 

 Further, Birula has remarked that the thoracic legs are relatively longer in S. Lilljeborgii than in S. 

 spinus, and if the two posterior pairs are compared in the two species the difference is fairly obvious. 

 As I have seen no transitional forms, I consider *S". Lilljeborgii to be a true, independent species, which 

 urther maybe called boreal and not arctic; it is absent from all the coldest places where S. spinus occurs. 



54. Spirontocaris macilenta Kr. 



1841. Hippolyte macilenta Kroyer, Nat. Tidsskr., 3. B., p. 574. 

 ! 1842. Kroyer, Kgl. D. Vid. Selsk. math.-naturv. Afh., Niende Del, p. 305, Tab. II, 



Fig- 55-56. 

 1879. S. I. Smith, Trans. Conn. Acad., Vol. V., p. 71. 



Occurrence. The "Ingolf" has not taken this species. 



It is mentioned in Malac. Groenl. that I had up to that time only seen 6 specimens in all, all 

 determined by Kroyer, but not his original specimens; when he wrote his monograph he had only one 

 specimen from Fiskeuaesset in south-western Greenland, and it must have been lost. Since 1887 the 

 Copenhagen Museum has received 4 specimens, taken at Jakobshavn by Traustedt. Vanhoffen states 

 that he has taken three specimens in Karajok Fjord (at ca. 70 20' N. L,.), one of them from over 50 fm. 

 — This species has not been found at East Greenland, Iceland, or the Fseroes. 



