564 PROFESSOR E. P. WRIGHT ON THE TEREDIDÆ. 
6. UrEROTUS, Guettard. 
Siphonal palettes spoon-shaped, depressed ; area elegantly ribbed, ribs forming teeth on 
the upper margin, U. clava (Gmel.). ; 
CALOBATES AUSTRALIS, spec. nov. (Plate LXIV. figs. 1-5.) 
Of this apparently new species but two imperfect specimens exist: they were for- 
warded to Dr. Bowerbank by Mr. Clifton, from Freemantle, Western Australia, and were 
consigned by Dr. Bowerbank to the British Museum. On examining them, the strange 
shape of the palettes at once struck me; and Dr. J. E. Gray, with the greatest kindness, 
gave me permission to describe them. Unfortunately no valves exist on either of these 
specimens. The portions remaining are, as represented in fig. 1, about 14 inch of the - 
lower portion of the animal, with the siphonal tubes and palettes. The siphonal tubes 
are united to their very tips, and extend, in the spirit specimens, just above the expanded 
portion of the palettes. "The larger tube has a double row of fringe-like tentacles, the 
smaller a single row, with the tentacles fewer in number. The palettes are situated 
right and left of the siphons, and, with them, are enclosed in a deep border of the mantle, 
which forms an almost circular fringe round the base of both; this border splits in two 
at the back of the smaller siphonal tube, its margin is slightly puckered, and the inte- 
gument covering it is rugose. The style of the palettes is about 3 inch long, strong, 
very sharp-pointed, and connected to the body by four very distinct muscles, which sur- 
round it; these muscles are themselves just covered by the fringe of the mantle. The 
style next expands into a broad dilatation, which is very slightly concave on its inner 
surface and convex on its outer: its upper surface is deeply excavated; and from this 
proceeds a blade-like appendage about 4 inch long ; this is directed obliquely, and is tuber- 
culated on its external surface. This description must necessarily be incomplete, owing 
to the specimens being defective ; and it is very possible that, on perfect specimens being 
discovered, it may prove to be only an Australian form of Calobates thoracites, Gould ; 
in order to facilitate comparison with which, I append, from Mr. Tryon’s monograph, 
the description of this species, adding a few remarks on the animal taken from the spirit 
specimen of Teredo furcelloides of Dr. Gray, in the British Museum, of which a figure 
will be found on Plate LXIV. 
CALOBATES THORACITES, Gould. (Plate LXIV. figs. 6-12.) 
Teredo thoracites, Gould, Bost. Proc. vi. p. 15 (Oct. 1856). 
Teredo furcelloides, Gray, Proc. Zool. Soc. 1861, p. 314. 
Calobates thoracites, Gould, Bost. Proc. viii. p. 280 (Feb. 1862). 
Shell large, solid, length and breath about equal; valves trifoliate; the anterior area 
large, about equal to the fang-like body, except that it is truncated anteriorly, where it 
is smooth, shining, and callous. This anterior area is obtusely lance-pointed and sculp- 
tured with concentric striæ parallel to its basal edge, and with a few delicate rug 
radiating from the beaks; the fang-like body is large and broad, obtuse at the point, and 
armed within by a firm rib, terminating in a rounded ivory knob; a strong flattened rib 
