150 DE. T. DAVIDSOX ON RECENT BRACHIOPODA. 



The Marquis of Monterosato and Dr. Gwyn Jeffreys would consider the Cistella 

 cistellula of Wood to he a synonym of C. Inniferax hut this identification seems to he 

 lancertain, and new material must he examined and compared hefore the matter can he 

 regarded as definitely settled. 



Uiicertam Genus and Sjwcies, 1859. 

 (The characters of the genus are given under Gioynia capsula. One species only known.) 



88. GwYNiA CAPsULA, Gwyn Jeffreys, sp. (Plate XXI. figs. 28 a, b, c, & 29.) 



Terebratula capsuhi, Jeffreys, Ann. & Mag. Nat. Hist. 3rd ser. vol. iii. p. 43, pi. ii. figs. 7(t, b, IS.jO. 



Gwynia capsula, King, Proc. of the Dublin University Zool. & Bot, Assoc, vol. i. p. 258, -woodcuts, 

 figs. 1-5, 1859. 



Arffiope capsula, Gwyn Jeffreys, Brit. Concli. vol. ii. p. 21, 1863, and vol. v. p. 164, pi. xix. fig. 5, 1869. 



Gwynia capsula, M. Sars, Om de i Norge forckommende fossile Dyrlevninger fra Quartaerperioden, 

 Christiania, p. 96, pi. iv. figs. 121, 122, 1865 ; Davidson, Br. Foss. Bracb. vol. iv. p. 5, pi. i. figs. 3-4, 

 1874; H. Friele, Arcbiv for Mathematik og Naturvidenskab, Bd. ii. p. 385, pi. iii. figs. 7 « & 6, 1877. 



Argtop)e capsula, Tei-quem, ' Essai sur le classeraent dcs animaux qui vivent sur la plage dans les 

 environs de Dunkerque,' 1879 ; Gwyn Jeffreys, Ann. & Mag. Nat. Hist. 5tb ser. vol. vi. p. 406, 1880, 

 audProc. Zool. Soc. 1881, p. 949. 



Shell thin, minute, pouch-shaped, or slightly elongated oval, nearly equivalved, longer 

 than wide, hroadest anteriorly, rounded in front ; hinge-line nearly straight or very 

 ohtusely angular, margins rounded at the sides. Dorsal valve convex, most so at the umho, 

 slightly depressed anteriorly. Ventral valve uniformly convex ; heak slightly prominent 

 and incurved ; foramen incomplete, margined anteriorly hy the umho, and hy small 

 rudimentary deltidial plates. Interior without loop or septa (?). Surface of valves 

 smooth ; shell-perforations rather large and f:\r apart. Lines of growth slightly marked. 

 Colour nearly white, glossy. Length two thirds of a line hy half a line in hreath. 



Salt. Off Plymouth, in 18-25 fathoms (Norman, from Wehster). On stones near 

 Guernsey, 8 to 20 fathoms (Lukis and Duprey). Duhlin Bay and off Portsmouth (Waller). 

 Belfast Bay, Larne, County Antrim (Hyndman and Gwyn Jeffreys). It occurs with 

 C. cistellula, nestling in hollows of old shells, Fectunculus glycymeris, and other hivalves. 

 Off Etretat, in Normandy, on stones which had heen taken up in trawl-nets at a distance of 

 ahout four leagues from land (Gwyn Jeffreys). Off Dunkerque (Terquem). M. Colheau 

 ohtained the shell from Sluys-Kill, Zeeland, near the Belgian frontier. Off Jersey, low 

 water (Duprey), where it adheres hy its short stout peduncle in an upright position to 

 the undersides of large stones which are sunk and partly buried in the sandy mud 

 (Gwyn Jeffreys). 



It also occurs fossil iu the Post-tertiary clays at Kirkoeu, near Christiania (Sars). 



Ohs. I have specimens of this minute shell, from the size of a microscopic dot up to 

 little more than half a line in length. I cannot, however, arrive at any other conclusion 

 than that it is the fry or young stage of some species not at present determined. The shell 

 has already heen referred to Terebratula, Arcj'wpe, and Gioynia. Dr. Gwyn Jeffreys and 

 Ilerr Herman Friele believe it to he referable to Argiope or Cistella, and in vol. ii. p. 22 of 

 his 'British Conchology,' Gwyn Jeffreys writes, " It may he the young of Argiope NeapoU- 



