Gryphoides Shell oval; fmooth, folid, opake; the leffer valve with a 
Flexuofas 
Rugofa. 
Cylinarica. 
Nucleus. 
Avenacea. 
- Gandalium. 
M] 
WORMS. TESTACEA. 68. Mytilus. 
Inhabits ———— found adhéring to the Madrepora prolifera : 
Jhell dirty ochre; with a large perforation at the tip, longer 
on one fide. 
ftraightifh obtufe truncate beak. 
Inhabits —— Sebret. Fourn, 4. tab. 2, fig. S. 
Shell whitifh: refembles A. Gryphus, 
Shefl very thin, lamellate, hollowed in the middle; the 
upper-valve flat; lower-valve convex towards the 
crown, with an orbicular -perforation beneath the 
crown. 
Inhabits Noravay eas, adhering to the Madrepora prolifera: 
Shell fmoke-colour, the convex part of the lower-valve filvery. 
Shell obovate ; the upper valve convex for the greater part, 
and very finely wrinkled; lower-valve very thin and 
fmooth with a kidney-fhaped perforation. . 
Schrat. Einl. in conch. 3. tab. 9. fig. 12. 
Inhabits Noravay feas, fixed to the Madrepora prolifera. 
Shell whitifh, with a very acute margin, 
Shell very thin, cylindrical and narrowed outwardly; up- 
per-valve gibbous, lower hollow. 
, Schrat. Einl. in conch. 3. tab. 9. fig. 13. , 
Inhabits North feas, adhering to the {pines of the Echinus Cidarisé 
Shell glabrous, oval and longitudinally grooved. 
Inhabits North feas. Mull. Zool, Dan. prodr. 3008. 
Shell pyriform, protracted and flightly compreffed towards 
the hinges. 
Inhabits North feas. Mull. Zool. Dan. grosr. 3004. 
Shell turbinate, the back flat, with a ftriate cavity; the 
lid flat and hemifphzerical. 
Inhabits Germany, in a foflile ftate: in figure fomething refembles 
the Madrepora turbinata: hell folid, thick, about the fize of 
a man's little finger : the lid or flat valve concentrically ftriate. 
68. MYTILUS. Anzmal allied to an Afcidia: 
Shell bivalve, rough, generally affixed by 
‘a byffus or beard of filky filaments: henge 
mofily without teeth, with generally a 
fubulate excavated longitudinal line. 
Muffel. 
a 
