44 Hector F. E. Jungersen. 
which L. prolifera lives and thrives may vary between 0.°3 C. 
and 13.°6 C. (the lowest temperatur past of the Færø-Bank, 
cfr. Note below, the highest south of Sicily, “Porcupine” 1870). 
In the Norwegian waters L. prolifera is said by Nordgaard 
(1905, p. 240) to require 6—7° C.; at Iceland I have found 
5.°9 C., from Rockall to west of Ireland the “Porcupine” found 
8.°1---9.°8, while Miss Stephens for the Irish localities men- 
tioned by her gives 8.°58—9,°55 C.; farther south along the 
west coast of the Spanish peninsula to Morocco the temperature 
raises a little, to 12.°9. At Tristan da Cunha the temperature 
seems to be 7°.28—9°17 C.°) 
Del myself have dredged, on the *Ingolf”, south of Iceland, living spe- 
cimens in 316 Fthms., 5.°9 C.; living and dead fragments were taken by the 
“Porcupine” 1869 on st. 54, east of the Færø-Bank, between the latter and 
the Hebrides, 363 Fthms., 0.°3 C., and on st. 15, between the west coast of 
Ireland and the Porcupine-Bank, 422 Fthms., 8.°3 C.; (cfr. “Depths of the 
Sea” p. 432). Perhaps the “living” specimens of L. prol. forma gracilis, 
mentioned by Duncan (“Porcupine” p. 332) as taken in deep water of 554 Fthms., 
off Tangier, also were really living. 
0) Unfortunately no bottom-temperatures are given by most authors. 
