"29 



?.er:iar--s ,- The disti:: ing features of this species, which 



d- .. epreseritation, are the relativel;' ■'' ^ .■-^^-rh -^--^-r-^li' 

 r ised concentric laniella.e and the somewhat ir , :■]?: rad- 



ial-s in the inters^naces. Some of the valves are "roportionatelj" 



'1 "^he one figured hy Dall. ?!:? ' ' ' ' -"-^ •■^onee 

 heti^/een this form and the relate" H. sa.firinata Dall (1^ . res- 



ent inhahitant of the 'i7est Indian waters, is pointed out above. 



(1). "Biill. LIus. Gompt. Zool., vol. 12, pp. 255-2G6, 1886; Proc. 

 IT. S. ITat. Kus., vol. 12, -. "^5?, pi. 14, ^ - . ^1, 138-9, 

 ( as Iiioina sagririat a ) . 



The single Tampa silex Sulopia that v/as re 1 to this 



species is no longer in t-n-^ T^ational K-nseiun and therefore no 

 material is avails'-'' jr u j..:-c.ri;;;'ju. 



Occurrence .- r Oligoct ,, : ? Tampa silx •, Jloriua 



(]Jd.ll, 1903, 191'^.); Lower I.'iocene: a^Ov.a'-ii □elu, jqv, aen, 



Jamaica (Dall, 1905, 1915). 



