250 



PATELLID^. 



of Costa^ Patelloides vitrea of Cantraine^ Patellapellu- 

 cida of Philippic and P. pulchella of Forbes. 



3. T. FULVA ^ Miiller. 



Patella fulva, Miill. Prodr. Z. D. p. 237. Pilidium fulvum, F. & H. ii. 

 p. 441, pi. Ixii. f. 6, 7, and (animal) pi. A A. f. 3. 



Body whitish : mantle fringed at the margin with fine short 

 transparent cilia : head prominent, furnished beneath with two 

 triangular lappets, one on each side : tentacles conical and 

 yhort, not bearing any tubercle or eye-stalk : eyes none : foot 

 oval, thick, occupying a space equal to about two-thirds of the 

 mouth or base of the shell. 



Shell cap-shaped or semioval, rather thin, semitransparent, 

 lustreless : scvlpture, numerous fine and sharpish ribs which 

 radiate from the beak ; their crests are minutely beaded ; the 

 concentric strige are as close-set as in other species, but are 

 much stronger and somewhat imbricated; the shell appears 

 under tlie microscope to be permeated by exceedingly fine 

 longitudinal lines : colour orange, bright reddish-brown, or 

 yellow, sometimes diversified by white rays of various widths : 

 heah sharp, placed very near the anterior end : mouth oval : 

 margin very thin, slightly scalloped by the ribs : inside highly 

 glossj', coloured like the outside : central scar forming a semi- 

 circular lobe in front and an oval one behind: pallial scar 

 too faint to be perceptible. L. 0-25. B. 0-185. 



Yar. 1. albula. Shell white. 



Yar. 2. expansa. Shell larger, more depressed, and broader 

 in proportion to the length. 



Habitat : Common on stony ground in 10-40 f.^ in 

 many parts of the west of Scotland ; Moray Firth 

 (Dawson) ; twenty miles oflP Kinnaird^s Head, Aberdeen-, 

 shire, in 30 f. (Thomas) ; Shetland, 40-90 f. (M^An- 

 di-ew and others) ; Cork Harbour, on Pinna rudis 

 (Humphreys) ; Youghal, with Crania anomala (Miss 

 M. Bail); off Cape Clear and Mizen Head in 50-60 f. 

 (M^ Andrew) ; west of Ireland, 100 f. (Hoskyns, fide 

 King). The 1st variety is found occasionally with 

 * Deep yellow. 



