28 LORD HOWE ISLAND. 



occur Pinna (sp. nov. ?), Lucina interrupter. Laink., Cardium nnedo, Linn., 

 and Mesodesma glabrata, Lamk., all, with the exception of the last, very 

 common. Large numbers are cast upon the beach, but they may be obtained 

 wherever the sand has a slight admixture of argillaceous matter, as at the 

 north end of the Lagoon, off the Old Settlement. Cardium unedo, the 

 " Strawberry cockle," exhibits endless varieties in its colouring. Some are 

 almost colourless, others with a few of the strawberry seeds on the anterior 

 sides ; others yellow tinted towards the ventral margins, or even a delicate 

 red tint ; some have the red specs carried on to the posterior slopes, whilst 

 again many are beautifully besprinkled across the whole breadth of the valves. 

 The colourless condition appears to represent old shells. 



The genus Becten is peculiar by its absence. We did not meet with many 

 bivalves of importance on the reef , but the commoner forms are Mytilicardia 

 variegata, Brug. ; two species of Avicula, A. fimbriata Keeve, and A. malle- 

 oides, Eeeve ; a few Lima multistriata, Sby. ; two species of stunted oyster, 

 a Modiola met with in all the pools and crevices, but specifically unknown to 

 Mr. Brazier; and two species of Area, A. (Litharca) decussata, Sby., and A. 

 divaricata, Sby. The first is moderately common, and distorted into all sorts 

 of shapes ; whilst the latter, unlike individuals from the more tropical islands 

 of the Pacific, are small and uncommon. Perhaps the most characteristic 

 bivalve found on the reef is a small clam, Tridacna elongata, Lamk., lying 

 half buried in cracks and depressions of the surface. It is also found on the 

 rocky ledges of the east coast. An example of Crassatella pulchra, var. 

 Cumingi, A. Ad., and a dead valve of Bectunculus costatus, Eeeve, were also 

 picked up. Neither Brachiopoda, nor Pteropoda were met with. 



The following is the complete list of Mollusca collected, as determined by 

 Mr. Brazier : — 



Spirula Peroni, Lamk. 

 Onychoteuthis Banksi, Leach. 

 Sepia latimanus, Q. fy G. 

 .Fusus Hanleyi, Angas. 

 Eanella leucostoma, LamJc. 

 ISTassa mucronata, A. Ad. 

 „ elegans, Kiener. 

 „ paupera, Gould. 

 Purpura succincta, Martin. 

 „ „ var. striata. 



,, „ var. textilosa. 



,, amygdala, Kiener. 

 ,, Smithi, Brazier (sp. nov.) 

 Commella tritoniformis, Blainv. 

 Eicinula morus, Lamh. 

 Sistrum chaidea, Duclos. 



,, marginalba, Bean. 

 Voluta nucleus, Lamk. 

 Columbella versicolor, Sby. 

 „ Tyleri, Gray. 



„ varians, Sby. 



„ Cumingi, JReeve. 



sp. 

 Engina armillata, Beeve. 



„ lineata, Beeve. 

 Mitra scutulata, Ghem. ? 

 „ sp. 



