DE. T. DAVIDSON ON RECENT BRACHIOPODA. 221 



Genus GLOTTIDIA, DaU, 1870. 

 Glottidia, DaU, American Journal of Conchology, vol. vi. jj. 157, 1870. 



Type Glottidia albida. Hinds, sp. 



" Sliell linguiforni, elongate, pedunculated ; general characters as in Lingula. 

 Neural [dorsal] valve provided internally with two sharp, narrow, incurved laminae, di- 

 verging from the beak, and extending about one third the length of the shell ; ante- 

 rior extremities of the laminae about midway between the mesial line and the margin. 

 Hsemal [ventral] valve with a mesial septum of about the same length, extending forward 

 from the beak. Anterior adductor impressions rounded, separated by a faint mesial 

 ridge, faintly impressed. Scar of the post-adductor close in the cavity of the beak, 

 rounded. No other evident scars. Shell smooth, perforate or imj)erforate. 



" This genus apj^ears to take the place in America of the genus Lingula, which has its 

 home in the Australian and Indo-Pacific seas." {Ball.) 



126. Glottidia albida, Hinds, sp. (Plate XXVIII. figs. 2-4.) 



Lingula albida, Hinds, Zoology of H.M.S. ' Sulphur,' p. 298, pi. xix. fig. 4, 1845 ; G. B. Sowerby, 

 Thes. Conch, p. 393, pi. \\\\\. fig. 6, 1846 ; Davidson, Ann. & Mag. Nat. Hist. 2nd ser. vol. ix. p. 377, 

 1852; L. Reeve, Couch. Icon., Mouogr. oi Lingula, pi. i. fig. 4, 1859 ; E. Sucss, Ueber die Wohnsitze 

 der Brachiopodeu, Sitzungsb. k. Akad. Wissensch. Wien, Bd. xxxvii. p. 230, 1859. 



Glottidia albida, Dall, Amcr. Joum. of Couch, vol. \\. p. 157, pi. 8. figs. 1-C, 1870 ; Proc. Acad. Nat. 

 Sci. Philadelphia, p. 204, 1873 ; Dall, Seieutific Results of the Exploration of Alaska, 1877 ; Davidson, 

 Report on the Brachiopoda, Voyage of H.M.S. ' Challenger,' Zoology, vol. i. p. 2fi, 1880. 



Shell narrow, elongated oval, linguiform, tapering at the beak, sides almost subparallel, 

 very slightly curved in front ; rather rolled, creamy white, smooth, shining, marked 

 with concentric lines of growth, rather flat, especially along the middle, or from near the 

 extremity of the beak to the front, with a slight mesial rounded ridge along the middle. 

 Peduncle stout, short, transversely wrinkled, exhibiting two longitudinal edges Avith a 

 groove between them. In the interior of the longest or ventral valve the beak is pointed, 

 with a small triangular-shaped thickening, grooved along the middle ; from under it a 

 narrow mesial septum of very small elevation extends to about one third of the length 

 of the valve. Posterior occlusor or central muscles obliquely oval, situated near the 

 middle of the valve, and separated by a faint mesial ridge. In the interior of the dorsa. 

 or smaller valve two diverging narrow septa of very small elevation extend to a little 

 beyond a third of the length of the valve ; at about the middle of the valve two oblique 

 oval-shaped central muscular sears, or posterior occlusors, are separated by a long faintly 

 marked mesial ridge; shell-structure calcareous and horny. Length of shell 1 inch 

 2 lines, breadth G lines. 



Hah. Magdalena Bay, California, in 7 fathoms, among sandy mud (Ilinds) ; San 

 Diego Bay, California (Hemphill). Dredged by Dr.W. Newcomb off Santa Barl^ara Island. 

 California, in 28 fathoms (Dall) ; Monterey (Stearns); Catalina Island (Cooper), in 10 to 

 60 fathoms ; muddy bottom, rarely on tidal flats in mud at lowest water (Dall). 



Obs. This species was briefly described by Pl. B. Hinds in 1845, and .since then more 



