469 
dermal- than in the main skeleton; only the isanchorae are found 
in a very great number in the dermal-membrane; hence no crel- 
loid crust is built. 
Spicules. a. Megascleres. 1. Acan- 
th ostyl es (fig. 23 a), generally thickest 
at the base, where they are also most 
coarsely spined; from the base in most 
cases a little tapering to near the apex, 
which is markedly set off; the longer 
styli are often without spines in the last 
fourth; length varying from ca. 90—210 
p, commonly about 145 p, by a thick- 
ness of ca. 12 p. 2. Ty lo ta (fig. 23 b), 
straight or nearly so, with beautiful oval 
heads; they are often slightly swelled in 
several places on the shaft; length ca- 
260 X 4 fi,, b. Microscl era. I s o c h e 1 a e 
(fig. 23 c—d), with strongly curved shafts, 
rather stout, total length ca. 28 p, ca. 
10—12 p broad, 18 p deep. 
This species is very interesting; it 
comes very near to D e n d y’s Crellomyxilla intermedia ; the external 
shape is nearly the same, the skeletal arrangement likewise, but 
no dermal crust is being built; and this point is the only real dif¬ 
ference (save specific ones) from the said species; it strongly con- 
firms the view set forth by Den dy, that the Crelleae are special¬ 
ised Myxillae. 
Crellomyxilla intermedia Dendy. 
Crellomyxilla intermedia Dendy (7), p. 364, PI. XV figs. 16—21. 
F'ig. 23. Myxilla crelloides nov. 
spec. a. Acanthostyli. b. Ty- 
lota. c. Side-, d. Front-vicW 
of isochelae. 
O 
d 
Hen and Chicken Isl. Hauraki Gulf. Hard bottom. 30/X1I.1914. 
Colville Channel. 35 fathoms. Sand, mud. 21/XII.1914. 
Two specimens. Enerusting, the one specimen very irregular, 
seemingly corresponding in shape with the “main body of com- 
pressed flabellate form“ of the specimen, which Dendy has de- 
scribed. In most features agreeing very well with the type spec¬ 
imen; only the tornota are here a little longer, up to 260 p; the 
isochelae are up to 40 p and by intermediate forms connected with 
small forms of ca. 12 p. 
