310 MR. T. DAVIDSON ON JAPANESE BRACHIOPODA. [Apr. 18, 



correct ; for it bears no resemblance to that species, and is a true 

 Rhynchonella, and approaches most in shape and surface to some 

 small examples of the Tertiary Rhynchonella bipartita of Brocchi, 

 and almost represents that species in the living state. In this last 

 remark Mr. Jeffreys concurs with me. 



Hab. Dr. Gould's specimens were dredged off the Japan coast, 

 30° 35' N., 130° 40' E., in 110 fathoms, sand, by Captain Stevens 

 of the 'Hancock.' Mr. A. Adams obtained it at Satanomosaki, 

 55 fathoms, and at Gotto in 48 fathoms. 



Family Lingulid^e, Cuvier. 

 Genus Lingula, Brug. 



Mr. Dall has proposed a genus Glottidia, in which he has placed 

 some of the species formerly classed with Lingula ; but even now 

 the number of recent so-termed species referred to the last-named 

 genus are too numerous, and will require to be carefully studied and 

 monographed. 



The genus Lingula made its first appearance in the Lower Silurian 

 rocks ; and some of its fossil forms bear much general resemblance 

 to one or two of the species now found alive, but are of course spe- 

 cifically distinct. Mr. A. Adams has dredged in the waters of 

 Japan four species, which appear to be tolerably distinct. 



Lingula tumidula, Reeve. (Pla:e XXX. fig. 1.) 



Lingula tumidula, Reeve, Conch. Icon. sp. 2; A. Adams, Annals 

 and Mag. of Nat. Hist. 3rd ser. vol. xi. p. 100, 1863. 



I have seen but one Japanese specimen, attributed by Mr. Adams 

 to Mr. Reeve's species. It is, however, a smaller shell, of a light 

 yellow colour, with a reddish-brown spot near the beak. Exteriorly 

 the shell is marked with a considerable number of close, almost equi- 

 distant, minute concentric projecting lines of growth, somewhat similar 

 to those we see in Lingula scotica from the Carboniferous period. 



Hab. From the mud of Tsaulian harbour, in the Korean archi- 

 pelago, 7 fathoms. 



Lingula smaragdina, A. Adams. (Plate XXX. fig. 2.) 



Lingula smaragdina, A. Adams, Annals & Mag. of Nat. Hist. 3rd 

 ser. vol.xi. p. 101, 1863. 



It is of a bright green colour, whitish in the middle and near the 

 beaks. Length 10, width 4 lines. It most resembles L. hirundo, 

 Reeve. 



Hab. Was found by Mr. A. Adams at Yobuko, 10 fathoms, mud, 

 and also in the China sea. 



Lingula dumortieri, Nyst. (Plate XXX. fig. 3.) 



Lingula dumortieri, Nyst, Coq. et Polyp. Foss. de la Belgique, 

 p. 337, pi. xxxiv. fig. 4, 1843. 



Lingula jaspidea, A. Adams, Annals and Mag. of Nat. Hist. 

 3rd ser. vol. xi. p. 101, 1863. 



