470 PROFESSOR G. J. ALLMAN ON THE HYDROIDA 
brought up from the enormous depth of 2435 fathoms. These evidences of abyssal hydroid 
life have never come into my hands: they appear to have been lost; so that a nearer 
determination of them is now impossible’. 
The cold area lying between Shetland and the Faroe Isles, where the bottom is over- 
flowed by a deep icy current from the Polar Seas, and whose discovery by the ‘ Porcupine’ 
explorers constitutes one of the most important additions to our knowledge of the physical 
geography of the North Atlantic, is not without a deep-sea Hydroid fauna, although its 
bottom varies from the freezing-point of fresh water to nearly two and a half degrees of 
Fahrenheit below it. The two new species of Thuiaria already alluded to were obtained 
from it where the temperature of the bottom was as low as 30° Fahr.; while, from the 
same area, the new Plumularian genus (Cladocarpus), with the new species of Diphasia 
and Lafoéa, also referred to above, were obtained from water whose temperature varied 
in different places from 30°5 Fahr. to 29°8 Fahr. 
It will thus be apparent that, so far as the natural history of the Hyprorpa alone is 
concerned, the results of the expedition are important, bringing, as they do, to our 
knowledge many species hitherto unknown, and throwing new light on the relations 
between this most interesting group of organisms and the physical conditions which 
surround them. 
The following species, already known and described in systematic works, were obtained 
during the expedition of 1869 :— 
| Name. N. lat. W. long. Depth. | bars arc 
‘ ol ee fathoms. | ° Fahr. 
Eudendrium ramosum .......... 59 34 7 18 542 | 43°8 
berate ees £0 23 0 33 E. 75 44-0 
Lafoéa fruticosa ... 6... 6. ee elee { 60 32 0 29 Gace | hag 
_ 60 23 0 33 E. 75 | 440 
TafoecatdumoOpa ec. wer sete ne ee { 60 32 0 29 FY es | arias | 
: 60 23 0 33 E. 75 44-0 
Filellum serpens .............. | 60 32 0 29 64. \ aga 
52 25 11 40 90 50:0 
Diphasia pinaster .............. |, 60 23 0 33 E. 75 | 440 
| { 60 32 0 29 64 49°1 
Sertularella polyzonias .......... 59 23 ‘a: 374 | 46:0 
Sertularella Gayi .............. 59 23 io: 374 46-0 
‘ e5ps 60 23 0 33 E. 75 44-0 
Sertularia abietina.............. { 60 32 0 29 64 49-1 
Thuiaria articulata.............. 60 14 6 LF 632 30°5 
Grammaria abietina ............ 62 1 5 19 114 45:0 
Hydrallmania faleata............ 59 34 7 18 542 43-0 
1 See Preliminary Report, Proce. Roy. Soc. vol. xviii. 1869, p. 429. 
