— 48 — 
Pachastrella? sp. 
(Plate IIT, fig, 27°) 
Spicules with three straight slender arms radiating at 
equal angles and in one plane. The extremities of the arms 
are not preserved, but they are nearly uniform in thickness 
throughout, and frequently one is ‘shorter than the other two, 
but whether this is merely accidental I am unable to say. 
Average length of arms 0,61mm. and width 0,045mm. Not 
uncommon. 
It is doubtful whether these three-armed spicules 
are merely spicules in which a fourth arm has not been 
developed or whether they belong to a different group of 
sponges than the Pachastrellidae. Mr. Carter states that in 
P. amygdaloides large triradiates are present in which the 
fourth arm or shaft is only represented by a short extension 
of the central canal zzszde the spicule; and P. connectens, 
O. Schmidt (Atlant. Spong. p. 65) is also stated to have large 
three-rayed spicules; and similar forms are also represented 
in Sphinctrella horrida, O. Schmidt (op. cit. p. 65) so that 
it is not improbable that they may belong to a species o¢ 
Pachastrella. 
Caminus? sp. 
(Plate III, fig. 26.) 
Spicule with three unequal arms in the same_ plane. 
One arm is stout, short, and rounded at the extremity, the 
others are elongated and gradually tapering. Length of shorter 
arm 0,38 mm.; thickness 0.067mm. I have only met with 
a single specimen. The only instance which I have seen of a 
spicule of corresponding form is represented in Camznus apiartum, 
O. Schmidt, (Atlant. Spong. p. 71. Taf. VI. fig. 14) from the 
coast of Florida. The scale to which O. Schmidt's figure is 
drawn is not stated, so that Iam unable to make a comparison 
as to their relative dimensions, 
