506 PROF. A. DENDY AND MISS L. M. FREDERICK ON 
The skeleton arrangement and spiculation agree with those of previously 
described specimens. 
Spicules : — (1) Oxea ; measuring about 0"23 by O'Ol mm. 
(2) Amphitylota ; some straight, others slightly undulating, measuring 
about 0-31 by 0-007 mm. 
(3) C-sbaped sigmata of two sizes, the larger measuring about 0'039 by 
0-0028 mm., the smaller 0-02 by 0-0014 mm. 
(4) Tridentate isochelse (chelse arcuntse) of two sizes, the larger being 
about 0-034 mm. and the smaller about 0-022 mm. in length. 
Previously known Distribution. Port Jackson {Ridley) ; Port Phillip 
Heads [Dendy) ; Amboina (Topsent) ; S.W. A.ustralia (Ilentschel). 
Register JVos. and Locality. III. 10, IV. 9, "Wooded Isle. 
39. Trachycladus l^vispieulifer Carter. 
Trachycladus IcBviapirulifer Carter [1879, 1885-6]. 
Trachycladus lavispindifer Dendy [1897]. 
(For further possible synonymy see Hallmanu's species [1916].) 
The external form of the single specimen resembles closely that of Trachy- 
cladus digitatus var. clavatus Hallmann [1916]. The branches, which 
anastomose freely, are subcyliudrical, and their surface appears minutely 
conulose owing to the up-pushing of the dermal membrane by the ends of 
the impinging skeleton fibres. The inhalant pores are scattered singly, closely 
and for the most part equidistantly over the entire surface, giving it a 
minutely reticulate appearance. The small oscula are scattered sparsely and 
irregularly. Colour in spirit whitish brown ; texture tough and dense. 
The skeleton arrangement calls for no comment. 
Spicules : — (1) Oxea; smooth, curved, of nearly uniform diameter 
throughout their length, bluntly pointedj measuring about 0-47 by 0-016 mm.; 
very rarely stylote. 
(2) Spinispii'ffi ; minutely spined, corkscrew spicules, usually of two com- 
plete turns, measuring about 0-0135 mm. in length ; very abundant. Simpler 
forms, 0- and S-shaped, are found frequently. 
(3) Microstrongyla; of two kinds — (a) slender, centrotylote, 0-019 mm. 
long ; (6) stout, rarely centrotylote, 0-016 by 0-003 mm. These microscleres 
are rare. 
We have examined preparations of this species in Mr. Carter's own 
cabinet, and feel justified in identifying with it the Abrolhos specimen, 
although the oxea of the latter are larger and the microstrongyla less 
abundant. 
Hallmann [1916] has endeavoured to distinguish between a .number of 
Australian species, some of which he describes as new. We are inclined to 
think, however, that the differences between Hallmann's specimens are not 
sufficiently great to justify specific distinction being made, and that probably 
