452 TUBULIPOIUD^E. 



rising from a short stem, triangular, narrow, of great 

 comparative thickness, tapering towards the extre- 

 mities, and bifid ; dorsal surface lineated and minutely 

 punctate. Zocecia 1-4 or 5 in each scries, the inner- 

 most the longest. Occcium prominent, somewhat pyri- 

 form, an inflation of the front surface of the branch, 

 involving the neighbouring tubes. 

 Height about f inch. 



Var. a {tennis, Busk) . Branches extremely narrow ; habit 

 very slender. 



THE variations to which this elegant species is liable are 

 chiefly those of habit. A very slender variety (tennis] 

 occurs ; and Busk records one from Madeira which is of 

 greater size and more robust in its mode of growth than 

 the northern form. There are also differences in the 

 number of cells in a row ; but they never seem to exceed 

 four or five. 



HABITAT. On corals, Gorgonia, Sertularian zoophytes, 

 &c., chiefly from deep water. 



LOCALITIES. Zetland seas (E. Forbes) : Outer Haaf, 

 70-140 fathoms; Hebrides (A. M. N.). 



GEOGRAPHICAL DISTRIBUTION. Naples, 40 fathoms, a 

 single specimen (Waters) : Hammerfaest, 12-20 fathoms 

 (Sars) : Grotsund, 50 fathoms (Goes and Malmgren) : off 

 Norway, 200 fathoms (Baron Uggla) : off Frederickshaab, 

 100 fathoms (Wallich) : entrance of Baffin's Bay (' Valo- 

 rous* dredgings) : Nova Zembla, Beluscha Bay, 30-70 

 fathoms; Kara Sea (Stuxberg and Theel). Var. tennis. 

 North Atlantic (Busk) : Florida (Pourtales) : Madeira 

 (J.Y.J.). 



RANGE IN TIME. Italian Miocene (Manzoni) : Canadian 

 Postpliocene (Dawson). 



