01^.1 .::it::3 (33;. .;ia) 30:,.. . ^ :;aii. 



3rasgatellites ( Jrassinella ^ -oo^-denensis Dall, 1907-, 3. I7s,r;rner 



]?ree Inst. Sci., Philadelphia, vol. 5, nt . 6, p. 1476, 

 pi. 30, figs. 2, 7. 



Beseription .- "Shell small, thick and solid, -oltunp, sub equi- 

 lateral, the aiiterior side a little shorter, "bea'is small, acute, 

 reo-arved; liiniile and escutcheon lanceolate, subequal, veil impress- 

 ed, smooth; valves with suhequal dorsal slOToes and -orominently arcu- 

 cte "base, sculptured with concentric, Glo£e-;jet, flattened threads , 

 which near the urabones are less crov^ded and slightly sharper; hinge 

 solid, stron?-, normal. Hei^-ht, 7.5, lenp-th '^.'', ^lianeter 2.':' mm." 



This io readilj dis tinguiehed from J. . 'iixo; i b; its more con- 



1. n , 



vex form, heavy jet smaller shell, and finer sculpture." (Dall, 1903 



T^pe locality .- "Bov/den, Jama.ica, 



■Jc 



'n:ar>s.- ^'he characters of this species displ- "ir.ite' 



range of variability. She typical form is almost eoui!l 1 , 



the riorspl margins slorie r'irectl-" from t? e Timbc '" ■■;-!lri~ure 



c nsists of rather fine concentric r^v^&a. :'ii ■- ' "or^^is the post- 

 erior dors'T.l raarc-in shows a tendency to be slightly concave and at 

 the same time the umbo is not as full. I^he soi:ilptT:re may resolve 

 itself into rather distaait, sharp rug'ae, thas a ?hing the 



sculpture of guppyi , but it 1 -er as coarse as in that species. 



Thr-re is also slight variatiiri r-i ;- ^ to ^': r. -^-f i_',--n ^■_ 



tion. 



