256 



elevalis, acutis, contiguis, antrorsum versis ; latere antico 

 superne subangulato, excavate ; latere postico rotundato, infra 

 paululum producto : cavositas albida ; cicatricibus perspicuis : 

 cardo invalidus ; dentibus apicalibus duobus divaricatis, laterali- 

 bus nullis. Diam. f ; lat. f poll. Hah. New Zealand. 



Very much like L. Jilan, but much smaller, more solid, and 

 less glossy. The anterior end is less developed, and the bulk 

 of the shell, as well as its most depending portion, is behind, 

 instead of before, the beak. 



LuciNA VESicuLA. Tcsta tenuis, sub-globosa, vix obliqua, pal- 

 lide flavescens, concentrice tenui-striata, radiatim obsolete stri- 

 ata : natibus submedianis, elevatis, anteversis ; margine dorsali 

 antice excavato, demum subalato, postice rectiusculo ; peripheria 

 reliqua circulari ; cardine edentulo ; ligamento in fossam obli- 

 quam internam posito : concavitas flavescens, punctis nitidis 

 notata. Long. 1^ ; alt. 1^ ; lat. |- poll. Hah. Tongataboo. 



Its surface is like L.jilan^ but its form is more ventricose, and 

 its dorsal margin is much less sloping, somewhat alate ; and this 

 is one of its most striking peculiarities. In form it is more like 

 L. undata, except that the reverse extremities correspond. 



LuciNA LENTicuLA. Testa parva, solidula, lenticularis, rotun- 

 data, convexiuscula, concentrice imbricato-striata, etiam striis 

 radiantibus decussata, alba, epidermide fuliginoso hicillic induta ; 

 umbonibus fere medianis, prominulis : cardo dentibus apicalibus 

 et lateralibus tenuibus instructus : intus incrassata, alba ; mar- 

 gine crenulato ; impressionibus profundis. Diam. | ; lat. -^^ 

 poll. .Hah. Coast of Patagonia ? 



This little shell has rather the aspect of an Astarte orCyprina, 

 and would be considered as such but for its lateral hinge teeth. 



Prof. Johnston, present by invitation, gave at the request 

 of the President, an account of the Green Sand deposits 

 of England. 



The green sand deposit in the southeast part of England had 

 long been known for its fertilizing properties, and it is exten- 

 sively used for manuring the hop lands in that quarter. He 

 attributed its fertilizing power to the presence of phosphate of 

 lime, of which it contains fifteen or twenty per cent. He men- 



