266 EMARGINULA. 



front slope convex, back slope nearly straight; latticed with radiat- 

 ing riblets (20 in number), and concentric riblets, at the intersec- 

 tions forming little rasp-like points. Outside dull white, inside 

 white, shining, radiately and subnodulately sulcate ; margin cren- 

 ulated; fissure narrow, subelongate, equaling f of the distance from 

 front margin to summit. Length 8, width 6, alt. 2 2 mill. (Souv.) 



Island of Art, New Caledonia. 



E. montrouzieri Souv. Journ. de Conchyl. xx, 1872, p. 56, t. 1, 

 f. 7. 



Differs from the closely allied E. clathrata Pse. in having the fis- 

 sure shorter, the shell wider, side margins nearly level, not arched. 

 It is less elevated than E. fenestrella Dh. There are fine transverse 

 markings on this shell, just as there are on E. clathrata, fenestrella, 

 bicancellata, etc. I have seen but a single specimen. 



E. CLATHRATA Pease. PL 63, fig. 12. 



Shell oblong-ovate, depressed ; basatside-margins strongly arched ; 

 apex a little back of the posterior third of the shell's length ; length 

 of the slit contained 4-4? times in length of shell. 



Surface having 20-21 strong radiating ribs, each one having a 

 series or band of fine close transverse incised marks down its center, 

 visible under a lens. Interstices cut into pits by concentric cords 

 which are less high than the ribs and scarcely modify the latter at 

 their intersections. There are about as many concentric cords on 

 each side of the apex as there are millimeters in the width of the 

 shell ; in front of the apex there are more concentric cords than at 

 the sides and behind. Near the summit the cords disappear, fine 

 concentric ripples taking their place. In the pits a strong lens 

 shows regularly arranged series of dots. Inside white, showing- 

 whiter rays and under a lens tessellated with blocks of dots. 



Length 9, width 6, alt. 2 mill. 



Sandwich Is. 



E. clathrata PSE., P. Z. S. 1862, p. 241. 



The E. clathrata of Sowerby (Thes. p. 212, f. 54, and Conch. Icon, 

 f. 35) is not the same. These figures represent a much shorter sliell 

 than any in the two suites before me, received from Pease. 



E. SUBCLATHRATA Pilsbry. PL 28, fig. 27. 



Depressed, broad behind, narrowed in front ; interstices foveolate, 

 and cancellated with concentric riblets ; apex placed toward the 



