APPENDIX. G31 



Sub-gen. glyphis, Carpenter (Capiluna, Gray). 



Animal with the edge of the mantle fimbriated and cover- 

 ing the margin of the shell. 



Shell with the surface cancellated, the margin crenulated, 

 callosity often truncate, sometimes laminated. Young shell 

 Pdinuliform, with the spire absorbed in the increasing aperture. 

 L. inaqualis is an example. 



Vol. i. p. 473. Genus TONICIA. 



Sub-gen. fannyia, Gray. 



Mantle broad. Shell with the valves moderate, sub-cordate, 

 rounded and far apart on the sides. T. disjuncta is an example. 



Genus HANIEYA, Gray. 



(Sub-fam. CRYPTOPLAClNiE.) 



Body depressed. Mantle spinulose ; lateral tufts of spines 



small. 



Shell with the exposed part of the valves broader than long; 

 margin of insertion of the valves entire, of the anterior and 

 posterior valves very narrow. 



Ex. H. debilis, Thorpe (included in the list of species of 

 Chcetoplura as Hanleyi). 



Vol. ii. p. 29. Genus ATLAS. 



The recent researches of Mr. J. G. Macdonald have shown 

 that the genus Atlas does not belong to the Bullidcc, or even 

 to the Mollusca. He considers it more nearly allied to the 

 Bryozoa, the ciliated circle of Atlas resembling the circle of 

 tentacula in a polype of BoiverbanMa. Possibly it may be the 

 larva of some genus of Annelida, as Mr. Macdonald observes 

 that it would appear to represent permanently the larval state 

 of Siphunculus. (See Max. Miiller, Archiv. 1850, v.) 



