24 E. KIRKPATRICK. 



The autodermal pentactins (VII. 2b^) are fairly numerous ; tlie odd proximal ray 

 is spined. Fig. 2b^ shows a tauactin. The rays of the curious angular diactins 

 (VII., 2b') form an angle of 60°. 



The hypodermalia are pentactins (VII. 2c) with long, deeply-curved paratan- 

 gential rays 1240 x 55/i,, tapering to a sharp point. In one or two instances these 

 spicules project out a small distance, and might be regarded as basalia. 



The autogastralia (VII. 2d) are hexactins with slender, sparsely-spined 

 cylindrical rays, each 188 x 5'6)u,. 



Intermedia. The strobilocomes (VII. 2f, f^) are 17 5 jj- in diameter; each primary 

 ray (13 "5/^ in length) ends in a cone or strobilus rounded at the distal end, and giving 

 off a series of four verticils of long slender S-shaped rays, each tipped with a toothed 

 disk ; the verticils increase in length from below upwards, the lowest and outermost 

 being the shortest, and the highest and innermost the longest. The plumes of the 

 secondary rays are more loosely tufted than is the case in most other species, where 

 the rays of the verticils and the verticils themselves are more closely packed. 



The graphiocomes (VII. 2e, e^) are 150ju, in diameter ; each primary ray is 

 7 ■ 25ju, in length and ends in a broad disk, from the whole distal convex surface of which 

 a diverging tuft of fine raphide-like rays is given off. 



The microdiscohexasters (VII. 2g, g^) are of large size, being 60jli in diameter ; the 

 primary rays end in a circle of disk-tipped secondary rays surrounding a central cone 

 continued into a ray ending in a disk. 



The new genus is near to Lophocalyx, but differs from it and from other genera of 

 Lanuginellinse in having no oxyhexasters. 



PI. VII., fig. 2, shows a thin section of one of the largest buds, which has an 

 oscule and central cavity. 



The section has been made in a direction slightly oblique to the long axis, and 

 shows the convex outer ends of the flagellated chambers ; although several of these 

 outer ends have been cut through, the artist has put them in, the figure being a 

 combination one, and, I fear, slightly diagrammatic. 



W.Q., January 2, 1904. No. 14 Hole. 329m. (180 fms.). 



INDEX OF MEMOIES EEFERRED TO IN THE REPORT ON THE 



HEXACTINELLIDA. 



1. Caetbe, H. J. — " On two new Sponges from the Antarctic Sea . . . ." Ann. and Mag. Nat. Hist., 



1872 (4) ix., p. 409. 



2. Carter, H. J.—" On the Genus Rossella . . . ." Ann. and Mag. Nat. Hist., 1875 (4) xv., p. 113. 



3. Hodgson, T. V. — The Geographical Journal, April, 1905. 



4. IjiMA, I. — "Studies on the HexactinelUda." Contribution iil. Journ. Coll. Sci., Tokyo, 1903, 



vol. xviii., art. 1. 



5. Ijima, I. — "Studies on the Hexactinellida." Contribution iv. Journ. Coll. Sci., Tokyo, 1904, 



vol. xviii., art. 7 {RossellidcB). 



6. ScHULZE, F. E. — 'Challenger' Report on Hexactinellida, 1887. 



