56 DE. T. DAVIDSON OX RECENT BEACHIOPODA. 



are formed on them by the overlapping of the concentric lines of growth. The ribs are 

 also somewhat irregular in some specimens. 



Waldheimia Orayi is extremely abundant in its favourite haunts. In Corean waters 

 it was dredged in great abundance by Admiral Sir Edward Belcher during the voyage 

 of H.M.S. ' Samarang.' A. Adams and Capt. St. John obtained it in similar abundance, 

 and say that it could be collected by thousands in certain places where it had been 

 washed on shore. Mr. Dall has observed that the blood in this species is red. 



31. "Waldheimia septigera, Loven, sp. (Plate XI. figs. 1-10.) 



Terehratula septigera, Loven, Index MoUuscorum Litora Scandiuavise occidentalia habitantium, 

 Ofversigt af K. Vet.-Akad. Fovb. 1846, no figure. 



TValdheimia septigera, Gray & Woodward, Cat. of Bracli. in the Brit. Mus. p. 59, 1852; Davidson, 

 Ann. & Mag. Nat. Hist. 2nd ser. vol. xvi. pi. x. fig. 1, 1855; E. Suess, Ueber die Wobnsitze der Bra- 

 chiopoden, Sitzunsgb. k. Akad. Wissensch. Wien, Bd. xxxvii. p. 200, 1859. 



Terehratula [Waldheimia) septigera, Reeve, Monogr. of Terehratula, Concb. Icon. pi. iii. fig. 10, 1860. 



Terehratula peloritana, Seguenza, Notizie succinte, p. 19, 1862. 



Waldheimia peloritana, Sequenza, Memorie della Soc. Ital. di Scieuze Naturali, voL i. p. -19, pi. vi. 

 fig. 10, 1865. 



Terehratula septula, Jeffreys (not Pbilippi), Brit. Concb. vol. ii. p. 14, 1863. 



Waldheimia septigera, Seguenza, Mem. della Soc. Italiaua di ScienzeNat. vol. i. p. 44, pi. vi. figs. 1-10, 

 1865 ; Bull. Soc. Geol. France, 2nd ser. vol. xxv., 1808 ; Bull. Malacologica Italiaua, anno iii., 1870. 



Terehratula septata, Jefl'reys, Proc. Zool. Soc. 1878, p. 407, pi. xxiii. fig. 1 (not Pbilippi) ; G. O. 

 Sars, Bidrag til Kuudskabcn om Norges arktiske Fauna : Mollusca Regionis ArcticcC Norvcgioe, 

 Christiania, pi. i. fig. 2, 1878 (not Pbilippi). 



Terehratula floridana, Jeffreys (not Pourtales), Proc. Zool. Soc. p. 407, 1879. 



Waldheimia septigera, Dall, Bull. Mus. Com. Zool. Harvard, vol. iii. p. 13, pi. 1. fig. 4, pi. 2. fig. 9, and 

 Proc. of tbe California Acad, of Sciences, p. 182, 1872; H. Friele, "Bidrag til A'estlandets Mollusk- 

 fauna, Vidensk.-Selsk. Forband. p. 57, pi. 1. fig. 2, 1875, and Tbe Development of tbe Skeleton of tbe 

 genus Waldheimia, Arcbiv for Matbematik og Naturvidenskab, Bd. ii. p. 380, pi. iii. figs. 5, 6, and 

 pi. iv. figs. 12-14, 1877; E. Deslongcbamps, Etudes Critiques sur les Bracbiopodes, p. 98, pi. i. figs. 17 

 & 18, pi. XV. figs. 4-6, and pi. xvi. figs. 1-3, 1884. 



Shell somewhat square, ovate or subpentagonal, broadest anteriorly, more attenuated 

 posteriorly, longer than wide, lateral edges rounded, wide and nearly straight in front, 

 anterior margin sinuated, corners obtusely rounded anteriorly. Dorsal valve evenly 

 convex to abovit half its length; anterior half divided into three lobes, the central one 

 by far the largest and widest, forming a slightly raised, rounded, wide mesial fold. 

 Ventral valve deeper than the dorsal one, with a wide concave sinus commencing at a 

 short distance from the beak, and gradually widening until it reaches the front ; beak 

 incurved and truncated by a rather large circular foramen, completed and separated 

 from the hinge-line by a deltidium in two pieces ; lateral portions of the beak rounded. 

 Surface of valves smooth, but marked by numerous fine concentric lines of growth. 

 Colour light yellowish or greyish white. Shell-structure punctate. Dimensions variable, 

 two large specimens measured: — 



Length 1 inch 8 lines, breadth 1 inch -l lines, deptli 1 inch. 

 „ 1 „ 8 „ „ 1 „ 1 line, „ 10 lines. 



