REPOET ON THE HEXACTINELLIDA. 209 



broken portion measures about three. From this it may he inferred that the whole body 

 had a length of about 10 to 12 cm. On the superior somewhat sharply terminated 

 margin there is a continuous border-fringe of projecting spicules. The skin of the upper 

 surface of the funnel is gradually raised to a distance of about 1 cm. from the body- 

 parenchyma as an independent lattice- work (PL XXXIII. fig. 1). On the external 

 surface traces are seen here and there of the narrow-meshed rectangular network of the 

 dermal membrane. 



In the parenchyma lie numerous long, thin, and somewhat pliable oxydiacts, on which 

 central tubercles or nodes are generally absent, or but slightly developed. Between these, 

 some medium-sized and numerous small, straight, regular oxyhexacts occur; the rays 

 of the latter exhibit a slight roughness (PL XXXIII. fig. 7). I have not found any small 

 oxyhexacts with bent rays. The dermal skeleton is characterised by the presence of 

 moderately large strongly developed hypodermal oxypentacts. The four tangential rays 

 bear autodermal piuuli with four short, strong, almost smooth basal rays, and a moderately 

 long, somewhat markedly spinose distal (PL XXXIII. fig. 6). Dermal amphidiscs are 

 represented by a somewhat large (0'5 mm. in length) form with broad, short, hemi- 

 spherically arched umbels, and with four or eight nodes at the middle of the axial beam. 

 The eight umbel rays are pointed like lancets, and not broadened out in shovel-like 

 fashion (PL XXXIII. fig. 4). I sometimes observed the sharp lateral margin of several 

 somewhat longer umbel rays uniformly beset with fine teeth in a saw-like fashion. 

 Besides these, the familiar small amphidiscs with short, flat, or hemispherically arched 

 umbels occur in great abundance, and also isolated medium-sized thinner forms with 

 eight to ten umbel rays. 



The skeletal elements of the lattice-work covering the upper surface of the funnel 

 agree essentially with those of the skin. 



The marginalia measure 0'6 mm. in length; the distal ray is covered with spines Hl^e 

 that of the pinuli; the proximal ray is smooth. In the centre are seen four cruciately 

 disposed, somewhat distally directed, bent tubercles with fine terminal points (PL XXXIII. 

 fig. 3). 



Hyalonema conus, n. sp. (PL XXXIII. figs. 8-15). 



South of Australia (lat. 50' 1' S., long. 123° 4' E., Station 158) a form of Hyalonema 

 was dredged from a Globigerina ooze bottom at a depth of 1800 fathoms. The basal tuft 

 was again torn away, but the rest of the body was otherwise tolerably intact. A portion 

 of a basal tuft with a small remnant of attached body was also found, and very probably 

 belonged to the same specimen. The body has the form of a cone, 6 cm. long by 5 

 cm. broad at the upper transversely truncated end, whUe the lower round end narrows 

 to about the thickness of one's little finger (PL XXXIII. fig 8). The somewhat incurved 



(ZOOL. CHALL. EXP. — PART LUI. — 1887.) Ggg 27 



