ypccinu'iis w liic'li seem to beloni;' Ihtc wcrt' IbuiKl vci'y spar- 

 sely in the plankton of 1890 from tlie followiiii:- places: 



In the sea 4() miles N'W of Gaukværø, '7i, 0—700 m.; 

 KvuMiangren I. -'Vi. o— llo ni.: the Vest Fiord 'A, — 200 m.; 

 (Skroven '/•.., (i — .'UXi m. The speeies appears with us only to occur 

 in deep water. 



Disfril)iitiu)i : Hitherto only found in the Irminyer yea, south 

 west of Iceland, n. lat. (iO" :?', w. lonir. 27" (Borgekt, 1. c). 

 Certainly an oceanic form, perhaps from the northern part of the 

 Culf Stream. 



C lepta JoRG. 

 (PI. XVIIL fig. 110). 



JORGENSEN, L. 91, p. 89. 



Is a larger, weaker species. There is particularly great di- 

 vergence in the radial beams, which in this species are generally 

 thin threads, while in the foregoing one, they are strong, thick 

 beams. The species varies, however, considerably. As a rule only 

 broken species are found, as it is easily destroyed on being 

 touched. 



Was very rare and sparse in the samples of 1899, in 1900, 

 on the contrary, not unusual. Genei-ally only in deep w^ater, yet 

 up to .50 m. 



Disfriliiifioii: Previously only known from the west coast of 

 Norwav. but not rai'e here in 1898. though alwavs in small numbers. 



VII D. 2. Challengerida Hcic. 



Protooystis Wall. (Challengcria Mirr.). 



P. xipbodon (Hck.) Bokg. 



Challengeria xiphodm Hck. Profoci/dw riphodon (Hck.) Bok- 

 GEKT L. 14, p. 27—28, f. 28. 



Rather frequent, but always sparse. Always in deep water 

 samples. 



Distribution: A temperate oceanic species, distributed from 

 the tropical part of the Atlantic to the north coast of Iceland 

 (Cleve, L. 40, p. 147). On the west coast of Norway, very rare 

 (1898). In the North Sea at several places in deeper water in 

 May and August 1903, especially in the northern opening towards 

 the Norwegian Ocean (L. 18, 1903—1904, nr. 1). According to 

 BoRGEET 1. c. also known from the East and the West Greenland 

 Cuirent, the Labrador Current and the Mediterranean. 



p. Harstoni (Murr.) Borg. 



BoROERT L. 14, p. 28, f. 30. ChaUenijma Harstoni Murr., 

 Cfl-. JORGEXSEX L. 91, p. 90. 



Rare and sparse, always in deep water. 



Distrihntion : On the west coast of Norway also rai-e, in deep 

 water. Also found in the northern part of the Gulf Stream at a 

 few places, up to south and west of Spitzbergen, also in deep 

 water. 



Is probably an oceanic species, perhaps boreal, or at any rate 

 belonging to the northern part of the Gulf Stream. Also found 

 in the northern part of the Pacific, at great depths. 



/'. tridcns (IIuk.) Bono. 

 Borgekt L. 14, p. 29, i'. 32. ('lutllriuirria triilms Hck., cfr. 



.JoRGENSEN L. 91, p. 90. 



Frequent, though nevei- runnerous, as a rule only in deep 

 water, up to ."lO in. 



Distrihution : FiXMiuent on the west coast of Norway, in August 

 1903 in large numbei-s in deep water oti' the coast of Bei-gen (]j. 

 18, 1903—1904, nr. 1). 



Also found many places in the North Sea and the northern 

 part of the Gulf Stream, as far as south and west of Spitzbergen. 

 According to Borgert 1. c. also known fiom the East and the 

 West Greenland Current and the Laluadoi- Current. Probably a 

 northern temperate oceanic form. 



ClialU'iiift'i-oii diodon Hck. 



Borgert L. 14. p. 30, f. 34. Cfr. .Jørgexsex L. 91, p. 91. 

 Challey,geron hderacanthum Jørg. 1. c. 



On more weakly developed (probably young) specimens, the 

 characteristic byspines are wanting. It is therefore centainly most 

 practical to do as Borgert has done and consider as one species, 

 ChaUengeron diodon, C. heteracanthnm and C. Natliorsti Cl. 



Not particularly frequent and as a rule very sparse, always 

 in deep water. 



Distribution: On the west coast of Norway, frequent, but 

 always sparse. Found at a few places in the North Sea (May 

 1903 at a great depth, according to L. 18) and the northern part 

 of the Atlantic up to the west of Spitzbergen, in deep water. 

 According to Borgert 1. c. also found in the Labrador Cui-rent, 

 the more southerly part of the Atlantic and in the Mediterranean. 

 Accoi'ding to Haeckel, ChaUengeron diodon has been found in the 

 south eastern part of the Pacific, at a great depth. 



C. Channeri (Mlrr.) Hck. 

 (PI. XVIII, fig. 111). 



ChaUengcriu Channeri Murray L. lot;, p. 22(5. ])1. A. fig. 12. 

 ChaUengeron Channeri (Murr.) Hck. L. 8(3, p. lGo8. Borgert 

 L. 14, p. 32, f. 38. 



I have only seen one individual which I have supposed to 

 belong to this species. Its shell was circular in outline, strongly 

 compressed, with 16 marginal spines, all more or less broken oti'. 

 Also the teeth of the peristome wq\-& broken otf. 



Diameter, 165 [j.. 



In the sea 40 miles NW of Gaukværo, '7i 1899, 0—700 m. 



Distribution : In the sea south west of the Faeroe Isles, and 

 the southern parts of the Atlantic (Borgert 1. c). On the 

 American side of the Atlantic (48° n., 42° w. according to Cleve 

 L. 40, p. 147, very rare). The Northern Pacific, at a gi'eat depth 

 (Haeckel 1. c). 



C armatum 



(PI. XVIII, fig. 



112). 



Borgert L" 14, p. 33, f, 39. C. WiUemoesii Hck. L. 86, 

 p. 1659, pi. 99, f. 13? 



Only one individual observed, this one also from the sea 40 

 miles NW of Gaukværo, >'*/i 1899, 0—700 m. Unfortunately I 

 missed this specimen before I had finished my examination and 

 drawiuf of it. 



