1898.] PLANKTON OF THE EAEEOE CHANNEL. 1027 



equally broad for most of their length, but then tapering slightly 

 towards the distal end, at which the tube expands suddenly into a 

 broad circular cushion. The margin of this cushion bears two 

 verticils of radially divergent, slightly curved, terminal branches, 

 about 10 to 16 in number ; these are about twice as long as the 

 inflated end of the tube is broad. Each branch is armed with two 

 lateral rows of numerous recurved denticles, and bears a terminal 

 spathiUa of 5 to 8 recurved teeth (Plate LXVI. fig. 4). 



One specimen : 480-350 fathoms, 46-47 Fahr. (Station 19 a). 



AULOCEEOS (AULOCEE^EA) TEiGEMixus Haeckel, Var. nov. 



A few shattered specimens, of what is probably only a variety 

 of the species above named, exhibited a verticil formed by the 

 twice-repeated dichotomous branching of the radial tubes, each 

 verticil thus consisting of eight tynes. 



The type species is known only from the ' Challenger ' Station 

 353, between St. Vincent and the Azores, at a probable depth of 

 2965 fathoms (open tow-nets). 



For the horizons of capture, see the table on p. 1022. 



AULOCOEYNE zETESios \ gen. et sp. n. (Plate LXVI. figs. 5, 6). 



Aulocoryne (Family Aulacanthida) : Radial tubes without 

 lateral branches, terminating in a club-shaped expansion which 

 carries numerous fine radiating spines. 



Aulocoryne zetesios : The spines of the terminal club are thin, 

 tubular, at first straight or slightly curved, then regularly zigzag, 

 lastly straight ; they are finely denticulate, and terminate in a 

 spathilla of about 8-10 recurved teeth (Plate LXVI. fig. 6). 



A single specimen only of this species was captured. Although 

 so broken that not a single head was left on the radial tubes, 

 many heads had been fairly well preserved with the calymma, and 

 there could be no doubt as to its structure. The fine spines cf 

 the terminal club are of the same character as the tangential 

 spines of Cannorhaphis spathillata and the radial spines of Ccelo- 

 drymus anchoratus: the same types of growth recur again and 

 again in the various families of Phteodaria, first as scattered 

 spicules, then as tubes radiating from the central capsule, then 

 bound together in a coherent skeleton. 



Unfortunately, the exact record of the horizon was lost ; it was 

 captured in either 13 e or 13 g. 



CCELODENDEUM (CcELODENDEIDIUM) RAMOSISSIMDM 



This species was fairly plentiful at Station 13 i. It has been 

 described as cosmopolitan, from various stations and depths, but 

 not, I think, from so far north as the Faeroe Channel. 



C(ELOPLEGMA MUEEAYANUM-TEITONIS 



These species of Haeckel are the extremes of a series of very 

 1 avXos, Kopvvrj, tubular club ; ^r^ffic, in honour of H.M.S. ' Eesearch.' 



