\< LNTHO in 



Yar. DXEQOEH8IB Pilshry. n. var. PI. 12 



Shell oblong, rather elevated, carinated, the ride*lo 

 Color buH'or liirht gray, mottled on tin- aides with olive or olive- 

 hlack : girdle light green with whiter sutural tuf'i-. 



Tin' intermediate valves an- rather minutely and acutely beaked 

 when not eroded ; are wide posteriorly, tapering antei iorly, but the 

 girdle does not cm-roach much at the sutures. Dorsal areas nar- 

 rowly triangular, having about a dozen flattened longitudinal striae 

 separated by narrower grooves. Latero-pleural areas covered with 

 a rather coarse but regular scale-like granulation, the granules Hat, 

 oblong. Posterior valve having the tegmentum covering the greater 

 part of the artieulamentum, somewhat diamond shaped, w!<l'-r th<n> 

 l<i<t, with the prominent macro <if the }/o*fi rim- thinl. 



Interior blue-green ; sinus rather wide, angular; sutural laminae 

 moderate sized, rounded. Posterior valve obscurely bilobed behind, 

 gently curved upward in the middle of the posterior insertion plate. 



<;ii'<lle (fig. 53) densely clothed with rather long, light green .yirnli x, 

 and having 18 or 20 tufts of longer whiter spicules, the tufts usually 

 not very conspicuous, and sometimes a few of them are lacking. 



Length 19, breadth 9 mill.; divergence 110. 



Length 18'., breadth 8 mill.; divergence 110. 



Length 11, breadth 6 mill. ; divergence 110. 



San Diego, California (Hemphill.) 



This may prove to be the adult form of Carpenter's A. m'!ru/<i : 

 but on account of the obvious discrepancy between my specimens 

 and his description, it seems best to retain it under a separate name 

 pending the re-examination of Carpenter's type. 



The covering of the whole girdle is more developed than in most 

 species, resembling velvet with a deep pile ; and the tufts are less 

 conspicuous than usual. The pustules are all drop-shaped and tlat- 

 topped. Black ones are scattered among the others, which are light 

 colored, often almost whitish. The ridge has ten or a dozen ex 

 tionally deep longitudinal stria. 1 (fig. 54.) 

 A. AI:I:\(;<NMI:S Carpenter. 



Shell elongated, elevated (at an angle of 110), pale brown, 

 variedly painted with rose and olivaceous. 



Intermediate valves strongly beaked, the interstices - 

 diverging from the beaks; dorsal area wide, pale, very delicately 

 longitudinally granulftte-striate, transversely most minutely corru- 

 gated; lateral areas indistinct; surface all strongly granulated, 



