38 
* P. VARIUS. Ostrea V. Turt. Lin. Pecten V. Pc® - 
Brit. Zo., vol. 4, pi. 61, fig. 64. Mont. Test. Brit,, vol. *> 
p. 146. Flem. Brit. An., p. 384. Less abundant. 
P. LINEATUS. Mont. Test. Brit., voi. 1, p. 147. Flem- 
Brit. An., p. 383. Scarcely common. I have only seen 
it at Falmouth. 
P. OBSOLETUS. Ostrea O. Turt. Lin. Pecten O- 
Pen. Brit. Zo., vol. 4, pi. 61, fig. 66. Flem. Brit. AB’> 
p. 385. Rare. 
* P. LEVIS. Ostrea L. Pecten L. Pen. Br. Zo., vol. j’ 
102. Mont. Test. Brit., vol, 1, p. 150, pi. 4, fig. 4. Th' s 
very pretty shell is not uncommon ; but is subject to great 
variety of colour, though always beautiful. 
* P. SINUOSUS. P. Pusio. Pen. Brit. Zo., vol. 4, pi. 61- 
fig. 65. P. Distortus. Mont. Test. Brit. vol. 1, p. 143- 
P. S. Flem. Brit. An., p. 384. By Sowerb}' constitute*' 
the type of the Genus Hinnites. Common, attached by 
the lower valve to rocks, or more frequently to eschar* 
foliacea. It is subject to apparent distortion in its growth’ 
but it acquires the length of about a quarter of an in 15 * 1 
before the irregularities begin, and afterwards becoin® 5 
waved without regard to the evenness of its situation. f* 
may be known at any stage by the ribs dividing in the' 1 ' 
progress, into smaller striae, of nearly alternate sizes. 
P. TUMIDUS. Flem. Brit. An., p. 314, described fro' 11 
Dr. Turton. Not uncommon on the shell of the pinn 8 ’ 
but overlooked from its minute size. In their young slat* 
the Pectens are moored to their situation by a byssus; bn* 
when loosened by accident or nature, it is not renewed, a® 0 
they are capable of some degree of motion, 
OSTRACEA. 
Ligament wholly or partly within. Shell irregular, foliate^' 
sometimes very thin. 
OSTREA. 
GENERIC CHARACTER: The shell adhering, val» e | 
unequal, irregular; beaks distant, becoming very uneq" 8 
by age; upper valve smallest, generally flat, and gradual’; 
advancing forward during the life of the animal. Hi |, o . 
without teetli. Ligament parlly internal, inserted in 
cardinal pit of the valves; pit of the lower valve increases’ 
by age, sometimes to a great length. 
* O'. EDULIS. Turt. Lin. Pen. Brit. Zo., vol. 4, p. 
Mont. Test. Brit., vol. 1, p. 151. Flem. Brit. An., p. 66’^ 
Oyster. Common on most parts of our coasts, and at® 
depths. It is found on the Pinna at the degth of 56* 
thorns. The oyster is cultivated for sale on the Tama > 
at Falmouth and Heliord. 
O. PARASITICA. Flem. Brit. An., p.392. Less conin' 0 
