MELVII.L AND STANDEN : MOLLUSCA FROM FALKLAND ISLANDS. 45 



stones about low water mark. Also cast up on exposed beaches after 

 gales "(R. v.). 



Lamellaria patagonica Smith.— Three species of this genus 

 are reported from the Magellanic region. The shells of two of these, 

 both described by Couthouy^ as Sigareti, have not been described, but 

 the soft parts nearly resemble the examples of the animals in the 

 present collection. The shell alone of L. patagonicus seems known, 

 and is identical with our examples. Low water, spring tides. 



Natica impervia Phil. — "One strap of spawn belonging to this 

 species was found in November during an extremely low spring tide" 

 (R.V.). 



Photinula expansa Sow. — " On the stems and roots of Macro- 

 cystis" (R.V.). 3 fathoms. 



Photinula taeniata Wood.— 3 1 fathoms. 



Fissurella picta L. — "Abundant, the shells of the largest speci- 

 mens being invariably covered with foreign growths. In these the 

 attachment between the animal and its shell is very slight indeed, a 

 gentle tap from the toe of a boot being usually sufficient to separate 

 one from the other" (R.V.). 



Fissurella polygona Sow. — On shore, low water. 



Fissurellidea hiantula Lam. {nott Rve.). — "A single specimen 

 found crawling on the mud inside a derelict vessel in Stanley Har- 

 bour" (R.V.). 



Acmasa CSeciliana D'Orb. — Identical with examples from Lively 

 Island, Falklands, collected by Miss Cobb, which (vol. 9, p. 103) we 

 referred to A. texilis Gould. Having subsequently forwarded one of 

 our specimens to the Rev. G. W. Taylor, of Gabriola Island, B.C., 

 who is engaged in a critical study of this very difficult genus, he writes 

 that he considers A. texilis and the allied A. persona Eschz. to be 

 molluscs entirely confined to the West American coasts, and that the 

 only Acmcece. likely to occur in the Magellanic province are A. viridula 

 Lam., A. cceciiiana D'Orb., and A. variabilis Rve. All these, he points 

 out, are alike in the pale-green coloration of the interior, a peculiarity 

 which is not found in limpets of this genus from any other part of the 

 world. Low water. 



Patella aenea Martyn. — " Common on rocks, stones, and piles of 

 timber, from half-tide to low-water mark" (R.V.). 



Var. deaurata Gmel. — Lake Point, after easterly gales. 



Nacella cymbularia Lam. — "Common on stems oi Macrocystis 

 and U Urvillea, at a depth of two fathoms, and found dead on shore 

 after heavy gales " (R.V.). Hooker's Point and York Bay, Port 

 William. 



I Could, " Wilkes Exped. Moll." p. 216-217, figs. 259-60, 



