HEXACTINELLIDA. 23 
The calycocomes (V. 2h, h’) are, on an average, about 225 in diameter, the 
primary rays being 9 in length; each capitulum, 6°75y in length and 14°5y in 
breadth, ends in two to four roughened secondary rays tipped with button-like disks. 
Hemidiscohexasters (V. 2k, k'), 100u in diameter, occur but rately ; the primary 
rays end in one to three secondary rays tipped with disks having four to six long 
recurved teeth. Fig. 21 shows an exceptional form, 91u in diameter, with thick 
primary and secondary rays, the latter again dividing into two or three short 
branches. 
The microdiscohexasters (V. 2m) are 43y in diameter, with primary rays 5°5y in 
length, and with a convex capitulum, whence about six disk-tipped secondary rays arise. 
Winter Quarters: (1) one specimen (A), the type, and a fragment (B), February 28, 
1902, McMurdo Bay, 36 m. (20 fms.) ; (2) a small specimen (C), No. 4 hole, January 
30, 1902, 75 m. (41 fms.); (3) a fragment (D), No. 12 hole, September 8, 1903, 
45-55 m. (25-30 fms.). 
Sup-Famity LANUGINELLIN2. 
ANOXYCALYX. 
Lanuginellinee without Oxyhexasters, with Graphiocomes. 
ANOXYCALYX IJIMAI. 
(Plate III., fig. 7, and Plate VII., figs. 2-29".) 
Sponge in form of a small compressed pyriform sack, with the surface studded 
with small conules and small flattened pyriform buds. With slender tufts of long fine 
diactin pleuralia and basalia. The orifice narrow and oval, with a plain rim, and 
without marginalia. Autodermalia stauractins (mainly) and pentactins, with the odd 
ray proximal, more rarely tauactins and angular diactins; hypodermal pentactins 
confined to the conules; autogastralia hexactins, with large microdiscohexasters, with 
eraphiocomes, and very large strobilocomes. 
The largest of the three small specimens is 2°2 cm. in the length of the body, and 
7°5 cm. in total length, ze. including the pleuralia; the greatest width is 1°7 cm. 
and the thickness 7 mm.; the slit-like orifice is 4 mm. in width. ‘The largest buds 
attain a length of 2 mm. 
The skeleton is mainly formed of bundles of diactins. 
Spicules. The diactin principalia of the bundles are very slender, wavy, 
tapering to fine points, and roughened at the ends; a much thicker kind are isolated, or 
with slender comitalia. Pl. VII., fig. 2a, shows a parenchymal triactin x 150. The 
slender wavy pleuralia attain a length of 5 cm. 
The autodermalia are chiefly stauractins (VII. 2b), with each ray 234 x 12p, 
slightly spined, curved inwards, rounded at the end ; occasionally these spicules have 
thick club-like rays (VII. 2b*). 
