702 
DR. WYVILLE THOMSON ON HOLTEN1A. 
Mollusca. 
Terebratula cranium , Miill. 
Crania anomala , Miill. 
Area nodulosa, Mull. 
Pecten vitreus , Chemnitz. 
Lucina borealis , L. 
Astarte compressa, Montfort. 
Venus casina , L. 
Mactra solida, L. 
Neoera costellata , Deshayes. 
Columbella Haliceti , Jeffreys* * * § , 
The species marked with a dagger are new to the British area. The assemblage of 
higher forms presents generally the character of the abyssal fauna of the Boreal region. 
Two specimens were procured of the specially interesting Phizocrinus Loffotensis , Sars, a 
small Crinoid belonging to the family Apioceinida:, and nearly allied to the fossil 
Pourgueticrinus of the Chalk. Phizocrinus was discovered in the year 1864 by 
M. G. O. Saes, in 300 fathoms water, at the Loffoten Islands within the Arctic Circlef, 
and has since been dredged by M. de Pouetales on the opposite edge of the Gulf-stream, 
off the coast of Florida J. 
Besides tangled masses of long spicules and fragments of siliceous sponges, we pro- 
cured during the day about fifty specimens of sponges more or less complete. These 
were referable to four genera, one of which was the genus Hyalonema , Gray, of which 
we got two species closely resembling the singular glass-rope sponges of Japan and the 
coast of Portugal ; and the remaining three genera were new to science. 
One of these new genera is the subject of the present Memoir. 
Holtenia§ (new genus). 
H. Caepenteei || (new species). Plates LXVII. to LXXI. 
Provisional characters and general description. — The body of the sponge is globular, 
elliptical, or subcylindrical. The length of apparently mature examples is from 90 to 
110 mm , and the extreme width from 70 to 90. The outer wall is formed of a framework 
of large separate siliceous spicules, whose rays are so arranged as to give the whole 
surface a stellate appearance. The external surface is invested with a delicate network 
of sarcode-threads which define inhalent pores. At the top of the sponge there is one 
* The above list of Eehinoderms and Crustacea is on the authority of the Rev. Alfred Merle Norman, and 
of Mollusca on that of J. Gwyn Jeffreys, E.R.S. The complete lists are in preparation, and will be published 
hereafter. 
t Memoires pour servir a la connaissance des Crinoides Yivants, par Michael Sars, Christiania, 1868. 
4: “ Contributions to the Eauna of the Gulf-stream at Great Depths, by L. E. de Pourtales, ’’Bulletin of the 
Museum of Comparative Zoology, at Harvard College, Cambridge, Mass., No. 7, 1868. 
§ I have much pleasure in naming this genus in compliment to His Excellency M. Holten, the accomplished 
Governor of the Earoe Islands, who showed the most intelligent interest in the success of our researches, and 
to whom we were indebted for the most friendly hospitality. 
|| As this is the most striking of the new forms which have hitherto rewarded our labours in the deep sea, I 
dedicate it to my distinguished colleague Dr. W. B. Carpenter, Y.P.R.S. 
if The metrical system of measurement is employed throughout. 
