62 

 CRASSATELLA sulcata. 

 TAB. CCCXhY.—Fio'. 1. 

 Spec. Char. Ovato-elongated, transversely 

 solcated ; anterior side produced, obliquely 

 truncated, defined by a ridge ; edge toothed 

 within, 

 var. /3, sulci broad, lost upon the anterior side. 

 Syn. Tellina sulcata. Srander, 89. 



J_ HIS may be considered either as sulcated or costated, 

 for the sulci are deep and rounded, equal to, and precisely 

 the reverse of the spaces between them, that is in var. a ; 

 in /3 they are broader and shallower, and the spaces be- 

 tween them assume the form of small and but slightly 

 elevated ribs, that are lost as they pass over the ridge 

 bounding the anterior side, while in /3 they are reflected 

 at an acute angle, and pass over that ridge : the var. /3 is 

 also a wider, more depressed and delicately formed shell : 

 the teeth of the hinge are perpendicularly striated in 

 both, and the anterior side pointed. 



This is quite a distinct shell from Peron's and La- 

 marck's recent C. sulcata from New Holland, although 

 possibly the latter author may consider it a variety, but 

 lie does not quote Brander, whose shell is entitled by 

 ])riority to the name sulcata, so that Lamarck's requires 

 a new one. The one before us is a common shell at 

 l^arton, nor does it appear that one variety is more 

 common than the other. 



CRASSx^lTELLA plicata. 



TAB. CCCXLY.— Fig. 2. 

 Spec Char. Oblongo-ovate, concentrically 

 and minutely plicated ; plicae reflected ; an- 

 terior side defined by an obtuse ridge, ob- 

 scurely truncated; margin toothed within. 



A. VERY neat and I believe new species ; the anterior 

 siile is less produced and not so strongly defined as in 

 sulcata ; its truncation is also longitudinal, not oblique ; 

 the teeth arc similarly striated. 



Found in a bed of clay eleven feet thick and twenty- 

 one from the surface, in a well dug at Bartley Lodg*e, 

 Stone Cross, near Southampton, and presented to me 

 by the Son of the worthy proprietor of that seat, Charles 

 Lyell, Esq. 



