CRUSTACEA MALACOSTRACA. 



Occurrence. The "Ingolf has taken this species at 4 stations: 



Baffins Bay: St. 33: 6 7 5 7'N.L., 55 30' W. L., 35 fm., temp. 0-8; 4 spec. 



Davis Straits: St. 31: 66 35' N. L., 5554'W. L,., 88 fm., temp. 1-6; i spec. 

 29: 65 34' 54 31' 68 - 0-2; 4 



26: 63 57' 52 41' 34 0-6; i 



In Malac. Groenl. I have given a large number of localities along the west coast of Greenland 

 from 7223'N. L. to 60 43' N. L.; later, Ortmann has given some places in Smith Sound, the most 

 northerly at ca. 79 N. L. On the east side of Greenland it has been taken at: Angmagsalik (ca. 65 T /2 

 N. L.), 90 fm., in the eel-seine, 8 specimens (Amdrup Expedition); Cape Tobin, 70 23' N. L., 22 W. L., 

 57 fm., clay with stones, 2 specimens (Amdrup Exp.); Hekla Harbour in Scoresby Sound, 70 27' N. L., 

 26 12' W. L., 5 specimens (Ryder Exp,); Forsblad Fjord, 72 27' N. L., 25 28' W. L., 9050 fm., clay 

 with stones and gravel, i specimen (Amdrup Exp.); it is also given from two East Greenland 

 localities: Kaiser Franz Joseph Fjord, 117 fm., clay, and 72 45' N. L., 22 58' W. L., 18 32 fin., clay 

 (Ohlin). It has not been found at Iceland. 



Distribution. On the east coast of North America the species begins at about 43 N. L. a 

 little south of Nova Scotia; off this peninsula it was taken in depths between 26 and 59 fm.; from 

 there it goes north to the St. Lawrence estuary, Newfoundland and Labrador (S. I. Smith). It has 

 also been taken at Point Barrow on the western part of the north coast of North America (Murdoch), 

 at the north east corner of Asia (Stuxberg), through Behring Straits and Bering Sea along Alaska 

 southwards to 56 I / 5 N. L., along the coast of Asia at Kamtschatka, in the Sea of Ochotsk and at the 

 Kuriles, 647 fm. (Mary Rathbun); finally, it is given from Vancouver Island, which lies at 50 N. L. 

 to the north of California (Smith). 



The description I gave in Malac. Groenl. p. 38 of the bathymetric occurrence etc. of the species 

 agrees exactly with the observations to hand; it was as follows: "It is already met with in 4 8 fm., 

 most frequently in 15 20 fm., but is nevertheless not rare in 100 120 fm. It has not been found in 

 greater depths than 120 fm. It is often found on muddy bottom, but is not rare on algal grounds, 

 stones or sand." 



Remarks. Smith states (Rep. Progr. Geol. Survey Canada 1878 79, p. 212 B), that his speci- 

 mens from Vancouver Island differ from the Atlantic specimens in several small respects; Holmes 

 (Occas. Papers Calif. Ac. Sc. VII, 1900, p. 178) says that a specimen from Alaska agrees exactly with 

 specimens from the Atlantic, but that specimens taken between Alaska and Vancouver Island formed 

 a transition between specimens from the last-named island and from the Atlantic. Ohlin gives the 

 largest specimen as 95 mm., two specimens from Angmagsalik and Forsblad Fjord are 92 mm.; one 

 of the largest specimens from West Greenland is 85 mm. 



In 1902 Miss Rathbun founded a new species, N. dentata which, according to her description 

 given in 1904, differs from N. lar in two characteristics, to which a third difference may be added 

 according to her figures, namely, the form of the antennal squama. She says regarding N. dentata 

 that it is "very closely allied" to N. lar, "it differs chiefly in the carina of the sixth abdominal seg- 

 ment terminating posteriorly in a small sharp tooth or spine". Though it is not expressly stated in 

 her diagnosis of N. lar, this "tooth or spine" should be absent in this species. An investigation of 



