- 1 



Section Bathyarca Kobelt. 

 AR3A (BATHYAR3A) H3KDERS0EI Dall. 



Soa-oharoa ( Bathyarca ) Ilendersoni Dall, 1898, Trans. I'/agner ?ree 

 Inst. Sci., Philadelphia, vol- 3, pt. 1, p. 653, pi. 



53, fif. 9. 



■Qesoripti on .- "Shell very small, much inflated, the hirge-line 

 as long as the shell, whi3h is of a roundel triangiilar form, with 

 rather prominent prosocoelous healrs; left valve v:ith fine, elevated 

 rounded concentric lines, crossed by closer, less prominent, and 

 finer ra^'ial lines; in the rig-ht valve, as nsnallin this section 

 of the genus, the radial sculpture predominates over the concentric, 



the latter though present heing inconspicuous; cardinal area mod- 

 erately wide, the healcs heing nearly medial, the surface of the 

 area longitudinally striated; hinge ^ith ahout five nearly verti- 

 cal anterior teeth separated hy a wide unarmed gap from six or seven 

 smaller, more ohlique posterior teeth; mar-in -^f the valves thin, 

 entire, or microscopically crenulated; the inner edges of the ad- 

 ductor scars slip-htly raise" above the inner surface of the valve. 

 Lon. ?, alt. 2, diara. 2 mm." 



"This minute little species is obviously adult, and about ten 



