98 
MARINE FAUNA OF ST. ANDREWS. 
well as in Shetland. He observes [in lit.) that in this form 
there are no skin-spicnla; feet with a large, circular, cribrose 
plate at the end, no spicula on sides; tentacles cased in large 
cribrose spicula of varied form—elongated, short, or most 
elegantly irregular and branched. 
Thyonidium commune , Forbes & Goodsir ; Forbes, Brit. 
Starf. p. 217, and Norman, op. cit. p. 317. 
A fragmentary specimen in the stomach of a cod. 
Fam. Synaptidae. 
Genus Synapta, Eschsch. 
Synapta inhcerens , O. F. Muller; Dr. Herapath, Journ. 
Micr. Sc. 1865, p. 4. 
[Plate IV. fig. 4, and Plate IX. figs. 6, 7, & 8.] 
The typical form occurs between tide-marks, as well as in 
the laminarian region, the anchor-plates having six apertures 
surrounding the central, and comparatively few openings in 
the narrow part to which the anchor is attached (see smaller 
figure in woodcut, which represents both forms x 210 diam.). 
Such agrees closely with examples from the Channel Islands, 
the Hebrides, and other parts. An imperfect specimen from 
the stomach of a haddock diverges very considerably in the 
form of its anchor-plates (woodcut, larger figure), since the 
