THE 
MONTHLY MICROSCOPICAL JOURNAL. 
NOVEMBER 1, 1870. 
I.—On the “ HEXACTINELLID,,” or Hexradiate Spiculed 
Silicious Sponges taken in the ‘ Norna’ Hapedition off the coast | 
of Spain and Portugal. With Description of New Species, and 
Revision of the Order. By W. Savitz Kent, F.Z.8., F.R.MLS., 
of the Geological Department, British Museum. 
(Read before the Royau Microscoricat Society, Océ. 12, 1870.) 
In the paper it is my privilege to communicate to this Society on 
the present occasion, I propose to give an account of all those 
sponges belonging to the same group as the beautiful Huplectella, 
EXPLANATION OF PLATES. 
Puate LXITI. 
Fic. 1.—Pheronema Carpenteri, } natural size, showing the basal origin and fasci- 
cular distribution of the long anchoring spicula. 
»  2—Pheronema Grayi, + natural size, showing the general and non-fascicular 
distribution of the anchoring spicula. 
», 3-16 represent spicula from various regions of the same sponge. 
»» 8 —Basal portion of an attenuate spinulate spicule from the oscular fringe 
x 100 linear. 
»  4-—Portion of an attenuate erectly-spined spiculum from the same region 
x 100 linear. 
» 5.—A filiform adpressly-spined spiculum from amongst the long radiating 
spicula of the upper region < 100 linear. 
»  6.—A portion of the same still further enlarged. 
»  7—An irregularly and profusely spined spiculum from the sponge body 
x 100 linear. 
»  8.—A portion of one of the large attenuate hexradiate spicula from the exte- 
rior surface of the sponge body x 100 linear. 
»  9.—One of the “spiculated hexradiate ” spicula (Bowb.), having one radius of 
the perpendicular shaft suppressed, from the interior portion of the 
sponge x 100 linear. 
» 10.—An irregular variety of the same type. 
», 11.—A spiculum of the same type having the terminations of the lateral radii 
echinate. 
»» 12.—Another variety of the same form, in which the perpendicular radius, 
suppressed in Figs. 9 and 10, is greatly produced. 
», 13.—Portions of attenuate spicula from the inher portion of the sponge, inter- 
crossing one another, and showing the relation of the spiculated hex- 
radiate and other smaller forms to them x 40 linear. 
14.—Minute fusiform echinate spicula from the same region x 200 linear, 
» 15.—Recurvato-birotulate spicula of the sarcode x 400 linear. 
» 16.—Termination of one of the anchorate spicula x 100 linear. 
Puate LXIYV. 
VOL. IV. Ss 
