MOLLUSCA. 53 



Family — PatellacejE. 



Patella. Linnceus. 



216. Patella insessa, Hinds, Ann. Nat. Hist., vol. x. p. 82. Testa. conica, ovali, fusca, tenuiter 

 transversim striata, intus alba ; apice maculis albis ornato. 



Inhab. San Diego, California. On the sea-weed. 



A small horny brown shell, remarkable for the white markings on the apex, 

 usually three, sometimes four in number, the central being rather the larger. It 

 was always found imbedded in the fronds of a Laminaria, which it was often 

 necessary to cut with a knife before the shell could be liberated. 



Patelloida. Quoy et Gaimard. 



217. Patelloida depicta, Hinds, Ann. Nat. Hist. v. x. p. 82. Testa minima, lineari, diaphana, 

 alba, lineis rufis apice radiantibus; lateribus compressis ; longa quadruple quoad longitudinem. 



Inhab. San Diego, California. Found in considerable numbers on the 

 surface of a Zostera. 



Small, delicate, and fragile, of a whitish colour, with irregular brown rays 

 diverging from the apex, about eight in number on each side, and sometimes dis- 

 posed to fork ; anteriorly, clouded with a dark spot ; and compressed at the sides, 

 making the length four times greater than the breadth. 



Family — Calyptrace^e. 



Ceepidula. Lamarck. 



218. Crepidula solida, (Plate XVI. fig. 7,8.) Testa ovali, elevata ; apice mediano, postico : 

 extus epidermide fusca. laevi, intus rufa; septo albo solidulo margine recto. 



Inhab. Bodegas, California. In six to ten fathoms, attached to dead and 

 living shells and to each other. 



The mouth is nearly circular, apex elevated, and the exterior covered with a 

 smooth brown epidermis. Within of a reddish brown, the internal plate small, 

 solid, and with a straight margin, upper surface and neighbouring parts white, 

 beneath, and sometimes with the margin, partaking of the colour of the shell. 



p 



