DE. T. DAVIDSON ON EECENT BEACHIOPODA. 101 



Obs. I have reproduced Mr. Ball's full description, as I have never seen the specimen 

 upon which the species (?) has been formed ; but I think its acceptance must be con- 

 sidered provisional. 



57. Magasella. ? Halving, d'Orbigny, sp. (Plate XVIII. fig. 5.) 



Terebratulal Malvince, d'Orbigny, Voyage Amerique IMeridionalCj vol. v. p. 674. uo. 779, ix. pi. 85. 

 figs. 27-29, 1846. 



Shell small, ovate or longitudinally oval, broader than long ; valves evenly convex, 

 without fold or sinus ; beak short, pointed, slightly incurved ; foramen incomplete, mar- 

 gined anteriorly by a portion of the umbo of the opposite valve and by two lateral small 

 deltidial plates ; beak-ridges sharply defined, leaving between them and the hinge-line 

 a flattened space. Shell perforated by minute canals. Interior details not known. 

 Length 4 lines. 



Sab. Obtained during soundings near the Isles Malouines by Dupetit Thouars. 



Obs. I have never seen this so-termed species, and it was not to be found at the Jardin 

 des Plantes. It is in all probability a young and immature shell. It is described here 

 for the sake of reference, but cannot be admitted as a well made-out species. 



58. Magasella incerta, Davidson. (Plate XVIII. figs. 2, 3 a.) 



Magasella incerta, Davidson, Report on the Brachiopoda, Voyage of H.M.S. ' Challenger,' Zool. vol. i. 

 p. 47, pi. iv. fig. 6 a, b, 1880. 



Shell elongated, pear-shaped, broadest anteriorly, tapering posteriorly, very slightly 

 and evenly convex, somewhat flattened, without fold or sinus, smooth, nearly white. Beak 

 in ventral valve pointed, nearly straight, with a large incomplete foramen extending from 

 under the extremity of the beak to the hinge-line, and margined partly by the umbo of 

 the dorsal valve and by small lateral plates. In the interior of the dorsal valve a short, 

 elevated, vertical mesial septum almost reaches to the bottom and middle of the opposite 

 valve ; it extends along the middle portion of the bottom of the dorsal valve to about 

 haK the length of the shell ; to its sides and to the base of the hinge-plate are attached 

 the principal stems of the loop, the reflected portion being small. Length 2, breadth 1|, 

 depth 1 line. 



Hah. Twelve examples of this small shell were dredged by the ' Challenger ' Expedition 

 west of St. Thomas, Danish West Indies, at a depth of 390 fathoms. 



Obs. I have reproduced the description and figures of this small species from my 

 report on the Brachiopoda of the ' Challenger ' Expedition. None of the specimens 

 exceeded the proportions above given. They look as if they were young and immature 

 examples of some species at present unknown ; and I have given the shell a provisional 

 name for reference-purposes. The types are in the Zoological Department of the 

 British Museum of Natural History. 



59. Magasella eadiata, Dall. (Plate XVIII. fig. 1.) 



Magasella radiate, Dall; Report on the Brachiopoda of Alaska and adjacent shores of North-west 

 America, p. 49, 1877. 



14* 



