188 GALEOMMID^E. 



are said to be provided with teeth ; so that either the 

 generic character in that respect requires alteration, or 

 the species in question may belong to Lepton or an 

 allied genus. 



The Galeommata inhabit rocky ground, and are found 

 at various depths, from low-water mark to the coralline 

 zone. An account of their habits, so far as they are 

 known, will be given presently, among other particulars 

 of our unique species. 



Galeomma Turto'ni *, Editors of the ' Zoological 

 Journal/ 



G. Turtoni, Turton in Zool. Journ. ii. p. 361, tab. xiii. f . 1 ; F. & H. ii. 

 p. 105, pi. xxxv. f. 11, and (animal) pi. O. f. 5. 



Body pure white : mantle partly closed in front, with an 

 opening for the foot, of a thin texture, except at the edge, 

 which is muscular and forms a tumid cord extending beyond 

 the shell ; from this cord is thrown off a double wavy margin, 

 one flake of which is stretched like an extremely thin skin 

 and covers the shell, and the other or inner margin is marked 

 with equidistant frosty-white tubercles or ocelli, 8 or 9 on 

 each side, with fine white intermediate filaments : incurrent 

 tube at the anterior side, wide, irregularly sinuous, and not 

 always present: excurrent tube at the posterior side, small, 

 with a plain orifice : gills of equal size : lips 2 on each side, 

 more coarsely pectinated than the gills, of which they appa- 

 rently form a continuation : foot worm-like, cylindrical^ 

 tapering to a point ; the byssal groove is at its heel, close to 

 the body. 



Shell transversely oblong, much compressed towards each 

 end, thin, opaque except when held up to the light, of a glis- 

 tening aspect : sculpture, numerous and delicate ribs, which 

 radiate from the beak to the margins, curling round towards 

 the back or hinge-area, and branching off (especially in front) 

 at irregular intervals ; these ribs are crossed by still more 

 numerous and fine transverse or concentric stria?, and by their 



* Named in honour of Dr. Turton, the well-known author of several 

 works on British Conchology. 



