Mr. H. J. Carter on new Sponges. 123 
laminar, does not present any prominence of its fibre 
parallel with the surface, as in the foregoing species, but 
a uniformly reticulated structure in which the interstices 
of different sizes are circular, like those of a similarly con- 
structed sieve ; it is also more or less repeated inwards, accom- 
panied finally by a tissue like that of the dermal layer, which 
appears to have filled the central portion, supported on a loose 
straggling reticulated fibre. Spicule of one kind only, viz. 
acerate, curved, fusiform, sharp-pointed at each end, smooth ; 
40 by 2-6000ths inch in its greatest demensions. 
Loc. Honduras. 
The specimen, which bears a label on which is written 
“¢ Honduras, D.,” isin the Bowerbank general collection, now 
in the British Museum. As Dr. Dyson supplied Dr. Bower- 
bank with specimens from Honduras, the “D” probably 
stands for his name. 
7. Phleodictyon niduliformis, Crtr., n. sp. 
This name is proposed for a species which has grown 
around the root or the stem of an aquatic plant in a conical 
_ form, with the largest end upwards, looking like a bird’s nest 
in its present state. Its vertical diameter is about 4 inches, 
and the same across the base of the cone or upper part; 
composed of concentric reticulated layers or coarse spiculo- 
fibre; faced externally by the same kind of isodictyal tissue 
noticed in the other species. Spicule of one kind only, viz. 
acerate, curved, cylindrical, abruptly pointed at each end, 
~ smooth; about 37 by 1-6000th inch in its greatest dimensions. 
Loe. ? 
The specimens, of which there are two in the British Mu- 
seum, numbered 206 dis, and registered 43. 4. 10. 27 and 28 
respectively, are much mutilated, but, bearing bits of Poly- 
trema miniaceum, may have come from some tropical climate, 
? West Indies. 
8. Phleodictyon vasiformis, Crtr., n. sp. 
This name, again, is proposed for a mutilated fragment of 
a vase-like form, now compressed, about 53 inches high, 
5 inches across the brim, and 14 inch thick in the wall. The 
latter is composed of two kinds of structures, viz. a dermal 
layer, which is homogeneous and isodictyal, continued over 
the inner as well as the outer surface, with a coarse spiculo- 
fibrous reticulated structure between, in which the vertical 
fibres predominate, and the interstices are oblique or elon- 
gated in the same direction. But while the isodictyal layer 
on the outer side is even and uniform in its structure, that on 
