No. 2314. 



LIST OF RECENT BRACHIOPODA—DALL. 



277 



This species is quite distinct from D. cumingi with which it has 

 generally been confused. The California specimens above cited are 

 probably adventitious, from scrapings of small coasting craft doing 

 business to the southward. When fresh the radial stripes of dark 

 color distinguish it sharply from any other species of the genus, but 

 these gradually fade out in the cabinet. The texture is much more 

 calcareous than that of any other west American species. The sur- 

 face of the upper valve is quite regularly radiately threaded, espe- 

 cially in the young. The horny part of the lower valve is continuous 

 behind the peduncular area, which is very large, the surface of the valve 

 about it is regularly radiately striated. In old specimens the striation 

 is obsolete or absent on the peripheral part of the upper valve, and 

 the surface is apt to be quite irregular. 



DISCINISCA CUMINGII Broderip. 



Orhicula cumingii Broderip, Proc. Zool. Soc, 1833, p. 124; Trans. Zool. Soc, vol. 



1, p. 143, pi. 23, fig. 1, 1833. 

 Discinisca cumingii Dall (strigata excl.), Bull. Mus. Comp. Zool., vol. 3, p. 42, 



1871; Amer. Journ. Conch., vol. 7, p. 76, 1871; Proc. Acad. Nat. Sci. Phila.' 



for 1873, p. 201,— Davidson, Mon. Rec. Brach., pt. 3, p. 202, pi. 26, figs. 23 



to 25 (fig. 26 excl.), 1888. 



Type locality. — Payta, Peru, in 6 fathoms. Cuming. 



Cat. No. 



16012 

 216281 

 178260 

 41845 



Locality. 



Acapulco, Mexico 



Panama 



Callao, Peru 



Callao, Peru 



Collector. 



Dr. Newberry . 



J. Zetek 



U. S. Expl. Exp. 

 U. S. Expl. Exp. 



Number 

 of speci- 

 mens. 



1 V. 

 3 V. 



1 V. 

 1 V. 



This is a thinner and more distinctly reticulated species than D. 

 strigata, without dark blackish radial stripes, and less calcareous. 

 The basal valve has a large peduncular area, which is figured by 

 Davidson. The sculpture outside of the area is concentrically lamel- 

 lose with faint radial striae, according to Broderip and Davidson. 

 The Museum specimens are all upper valves. 



