melvTll and staNdEN : marine shells from lively island. 105 



white, scarcely shining, the pallial line to some extent sinuous, but 

 not very distinct. 



Chione (Omphaloclathrum) exalbida Chemn. — Three ex- 

 amples, varying in growth and development. A massive, flat, oblong 

 shell, with raised concentric striae. Occurs in Straits of Magellan. 



Cryptodon falklandica E. Sm. — A shell with some affinity to 

 Axinus flexuosus Mont. 



Saxicava antarctica Phil. — A stout coarse shell, found burrow- 

 ing in the roots of the large seaweed. Recorded from coasts of 

 Chili (Paetel). 



Thracia antarctica sp. n. (PL I., figs. 13, 13a). 



T. testa deformi, fere cequivalvi, sordide alba, tenui ; valvis ambabus 

 concentrice ri/distriatis, convexis, utrimque hhdcis, antice rotundatis, 

 postice truncatis, brunneo-sordesceidibns, rudilamellosis; ujnbonibus in 

 uno specimine prominulis, incurvis, contiguis, in altero fere immersis; 

 margine dorsali postice paidlum excavato, antice leniter declivi, ventrali 

 fere recto; dente cardinali magno, cochleari '; superficie interna alba, 

 paidlum prisma tica, linea palliali obscura, sinuosa. Lat. 15, alt. n, 

 diam. 6 mm. 



To some extent resembling T. distorta Phil, from North Europe, 

 or T. cuneolus Rv., this very interesting little form differs from both 

 in decidedly less rotundity of outline ; it is, indeed, a far more typical 

 eu-Thracia, though to some extent liable to the Saxicava-Wke deformity 

 so often present in our North European 77?. distorta. 



It is of a dirty white, posteriorly stained with brown, and truncate, 

 anteriorly rounded, the umbones contiguous and prominent in one 

 specimen, while in another they are almost immersed ; the dorsal 

 margin is posteriorly slightly excavate, anteriorly gently sloping, the 

 ventral margin almost straight. The surface is concentrically rudely 

 striated, the valves convex, almost equal. Interior surface slightly 

 nacreous, whitish, pallial line obscure, sinuous. 



Only one Thracia (T. similis Conr.), of quite a distinct group, has, 

 till now, been reported from South American shores. 



♦*♦*♦ 



Helix neraoralis and H. virgata without food for fourteen months.— In 



September, 1894, I collected about eighty specimens of Helix nemoralis and a some- 

 what larger number of H. virgata. As I had not time to clean them, they were 

 sent home in a cigar box which was inadvertently placed among a number of empty 

 boxes in a cellar, exposed to the cold of winter and the draught from a ventilator 

 looking towards the north. They were re-discovered on Saturday, October 26th, 

 1895, and it was found that on placing them in tepid water for a few minutes, eight 

 H. nemoralis and five H. virgata recovered and appeared little the worse for their 

 long fast. — A. Hartley {Read before the Society, Nov. 6th, 1895). 



