REPORT ON THE HEXACTINELLIDA. 389 



somewhat conical, superiorly truncate terminal umbels with eight somewhat In-oad paddle- 

 shaped rays. The dermal and gastral pinuli have moderately long toothed basal rays, 

 bent in figure 8 fashion, and an elongated somewhat bushy but pointed distal. South- 

 west of Canary Islands, 1525 fathoms. 



Species 2. Poliopogon gigas, n. sp. 



A very large, thick-walled, plump goblet, with a spacious gastral cavity more than a 

 span wide, and opening by a circular osculum. Besides the parenchymal spicules 

 mentioned in Poliopogon amadou, there are here small smooth spindle-shaped oxydiacts. 

 The large amphidiscs resemble in form those of Poliopogon amadou, but have somewhat 

 longer terminal umbels. In the pinuli the radial ray is shorter and less thickly spinose 

 than in the otherwise very similar pinuli of Poliopogon amadou. Between the Raoul and 

 Macaulay Islands, north of New Zealand, 630 fathoms. 



Subfamily 2. Semperellin.e. 



With the single genus Semperella, Gray. 



With the single species Semperella schultzei, Graj^ 



The elongated club-shaped body bears at its base a brush-like root-tuft, but neither a 

 simple round oscular aperture at its superior, gently conical end, nor a simple internal 

 gastral cavity within. It is traversed by a connected system of thin-walled tubes, as 

 thick as a little finger, associated with an axial main tube. Between these an approxi- 

 mately equal set of connected interspaces are left. While the lumen of the connected 

 (efferent) tubes opens on the four to six, rounded off and irregular, longitudinal sides, and 

 on the superior conical extremity of the club-shaped body by a sieve-shaped covering 

 with comparatively wide meshes, the interjacent (afferent) canal system is covered on the 

 flat sides of the body by a fine-meshed quadratic framework. The skeletal spicules 

 resemble, for the most part, those of Poliopogon amadou. The long uncinates have, 

 however, more strongly developed and somewhat curved spines. Besides the long 

 spinose oxyhexasters, numerous reduced forms of the same occur, down to long spiny 

 oxydiacts, and more rarely small uncinates with short spines and conically pointed 

 extremities. The dermal pinuli have tolerably short, for the most part 8-shaped basal 

 rays, and a short, strongly developed, and pointed distal with strong prominent lateral 

 spines. The pinuli which occur on the dermal sieve-work of the excurrent region are, 

 on the other hand, long and slender, w4th somewhat short, upward bent lateral spines. 



The aljundant and large amphidiscs, which occur especially in the dermal sieve-work 

 of the excurrent region, have a strongly developed and knotted axial rod, with eight broad 

 paddle-shaped terminals, somewhat conical, terminally truncated, short principal rays. 



