502 PROF. A. DBNDY AND MISS L. M. FREDERICK OK 
The main skeleton consists o£ a well-developed, coarse reticulation of 
stout, compact, multispicular fibre up to about 0'2 mm. in diameter, composed 
of closely packed megascleres with little or no spongin. The meshes of the 
reticulation vary much in size, 0'8 mm. being an average diameter. There 
is a loose dermal reticulation of ill-defined spicular fibre and loose spicules, 
with more or less dense, radially arranged brushes of slender tylostyles. 
Spicules: — (1) Tylostyli (Pi. 26. fig. 12a) ; often slightly curved or 
crooked, with a well-developed oval head separated from the fairly stout 
shaft by a slight constriction ; fairly gradually sharp-pointed at the apex ; 
size about 0-28 by 0-008 mm. 
(2) Sigmata (PI. 26. fig. \2h) ; slender, simple and contort, with short, 
abruptly recurved, sharply-pointed ends. Length about 0'04 mm. from 
bend to bend. 
(3) Large quadridentate anisochelas (PL 26. fig. 12 c-c") ; very numerous, 
mostly in rosettes, but scattered singly as well. The free end is composed 
of four short, sharply-pointed teeth which extend more or less at right angles 
to the shaft, which is markedly curved and fairly stout; the fixed end is 
quadrilateral in side view, with the three teeth almost parallel to one another : 
the median tooth connected with the shai't by a long, narrow falx. The total 
length of the spicule is about 0'04 mm. and the shaft is about 0'004 mm. in 
diameter. 
(4) Small, semi-bipocillate anisochelse (PI. 26. fig. 12 d) ; mostly in 
rosettes ; measuring about O'Ol mm. in length ; the free end of the markedly 
curved shaft is expanded into a flat, saucer- shaped fimbria ; in front view 
this appears as a narrow, slightly curved cross beam at the outer end of the 
shaft ; the fixed end is quadrilateral and of the chelate type. This form of 
microsclere is probably intermediate between an anisochela and a bipocillate. 
(5) Small, palmate anisochelffi of the lophon type (PI. 26. fig. 12 e) ; with 
only a very minute spur at the small end ; these occur scattered singlj^ and 
are not so abundant as the other microscleres ; length about 0'017 mm. 
This sponge appears to be almost identical with Pseudoespma enigmatica 
(olim Esperia parasitica Carter [1880]) except for the absence of sandy 
fibre so characteristic of Carter's specimens. We have examined a micro- 
scopic preparation of Carter's type-specimen (?) in the British Museum 
collection, and find that the small, semi-bipocillate anisochelse are certainly 
present, though not mentioned in his description. 
Register JSo, and Locality. II. 15, Wooded Isle. 
33. PSEUDOESPERIA TRICHOPHORA n. Sp. 
The single specimen consists of a small, light-brown fragment encrusting 
a Hircinia sp. ? 
The main skeleton consists of a reticulation of stout, ill-defined spicular 
fibre with many loose megascleres scattered irregularly ; radially arranged 
brushes of tylostyles lie vertically to the surface. 
