ASPIDOBRANCHIA. PATELLADZ. pi 
Shell rather elongate, depressed, with very obsolete, radiating 
ribs, concentrically striated, the apex near the anterior margin ; 
the epidermis horn-coloured. Length never exceeding half an 
inch. 
Colour white, rayed with rose-red or violet: these rays are 
obscured by the epidermis. 
This species is not uncommon on most of our coasts, 
but generally is only to be taken alive by dredging. It oc- 
curs in Salcombe Bay, Torquay, Plymouth Sound, Devon ; 
Padstow, Cornwall; Dover and Sandgate, Kent; Hastings, 
Sussex ; Tenby, Wales; Dunbar and Bantry Bays. It adheres 
to old shells, to stones, and more rarely to sea-plants, and-is 
sometimes found at low tide adhering to them. 
Young shells are much elevated, and in this state are quite 
pellucid, and frequently have no rays. 
3. PaTreLtuaA CLELANDIANA. 
P. testa subelongata, subdepressa, rufo-radiata: radiis interdum 
coalescentibus (hine subreticulatis), interné ceerulescente-al- 
bida; margine et apice badiis. 
Patella Clelandiu, Sowerby, MSS. 
Habitat in mari Hiberniensi rarissimé. Mus. D. Goodall et 
Sowerby. Alt. 1; lat. + une. 
Shell somewhat elongated, rather depressed, radiated with 
red, with the rays sometimes coalescing (somewhat reticulated), 
internally bluish-white; margin and apex chestnut-brown. 
Length nearly an inch. Breadth three-quarters of an inch. 
Found in Bangor Bay, Ireland, by J. Cleland, Esq. 
‘Genus 103. Patina. 
Patella Auctorum. 
Branchie foliacez, imbricate, pedem undique nisi anticé 
circumdantes. 
Branchize composed of imbricating, foliaceous processes sur- 
rounding every side of the foot, excepting its anterior aspect. 
