NOTES AND QUERIES. 191 
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Dabchick (Podicipes fluviatilis). St. James’s Park. —C. Mreape Kine 
(3, Harcourt Buildings, Temple). 
PISCHS. 
Yarrell’s Blenny and the Two-spotted Goby at Scarborough.— While 
poking about in the rock-pools in the South Bay, Scarborough, last July, I 
captured two small fishes, with which I was unacquainted, I sent them to 
Dr. Giinther, who kindly named them for me as Yarrell’s Blenny (Care- 
lophus ascanit), and the Two-spotted Goby (Gobius ruthensparri). Both 
species, he says, are not very common, and are somewhat local. Since then 
I have seen two other specimens of the former, but have not succeeded in 
finding any more of the latter. — W. G. Cuarxe (44, Huntriss Row, 
Scarborough). 
MOLLUSCA. 
Abnormal Scalariformity in Shells.—In August, 1893, whilst examining 
the dykes at Pevensey, I came to a spot where the weeds were particularly 
dense, and here met with an irregularly scalariform shell (immature) of 
Planorbis complanatus, and another regularly scalariform specimen of P. 
vortex var. compressa (Mich.), both being dead shells. Having examined 
these closely, and mentally ruminated as to the probable cause of this kind 
of deformity, I drew a decided conclusion that the animal from some cause 
or other—possibly a deformity or a wart at the back of the head—was 
induced to direct the head downwards, in which case the shell-whorls would 
be formed at an angle. Being impressed with this idea, and hoping to 
obtain a living specimen, I went again to the same place, and obtained 
another similar specimen of P. complanatus, alive. On examining it with a 
one-inch objective (which I-always use as a pocket-lens), I saw distinctly 
several minute white worms attached exactly where I had expected to find 
the causa mali, that is to say, on the head between and around the tentacles. 
_ They attached themselves by the hinder portion of their bodies, the front 
part being free and waving about, as if on the look-out for anything in the 
shape of food. The action was exactly similar to that of a caterpillar, and 
they looped their bodies similarly also. The lip of the shell evidently 
formed a capital shelter, from under which they could protrude or withdraw 
their bodies. On examining one of the worms under the microscope—for 
they were rather minute, perhaps a line or so in length—I found that the 
sete were placed more on the ventral surface than usual, and that they 
occupied only the posterior half of the animal, with the exception of a pair 
of oral tufts, which were directed forward. ‘There were some seven pairs 
of bristle-tufts in the hind portion of the body, and an average of ten 
bristles in each tuft, making 140 bristles in all. With a quarter-inch 
_ objective it could be seen that each bristle was terminated by a double hook 
