DK. T. DAVIDSON ON RECENT BRACHIOPODA. 17 



Mauritius, although lie has been studying' conchology there for the last forty-live 

 years. 



10. LiOTHYRis ? vel Terebratulina Dalli, Davidson. (Plate II. fig. 23.) 



Tvrebrutula ? Dall'i, Davidsou, Proc. Eoy. Soc. vol. xxvii. p. 437, 1878; and Report on tlie Brachiojioda. 

 Voyage of H.IM.S. ' Cliallengcr/ Zool. vol. i. p. 38, pi. ii. figs. 15, 15 a,h, 1880. 



Shell small, thin, longitudinally oval, globose, glassy, semitransparent. Dorsal valve 

 moderately convex, slightly depressed anteriorly. Ventral valve uniformly convex, a 

 little deeper than the dorsal one. Beak small, slightly incurved, and truncated by an 

 incomplete foramen, laterally margined by small deltidial plates. Surface of valves 

 covered with fine, radiating, raised stria?, with shorter ones here and there, interpolaterl 

 between the longer ones. Loop short and simple. Length 3, width 2 lines. 



Hab. One example only, without the animal, Avas dredged by the ' Challenger ' Expedi- 

 tion near Yeddo, olf Japan, lat. 34° 37' N., long. 140° 32' E., depth 1875 fathoms. 



Obs. I am not quite certain whether this small shell is a Liothyris or a Terebratulina. 

 Its generic claims must be considered uncertain. 



Subgenus Terebratulina, d'Orbigny, 1847. 



The subgenus Terebratulina is closely allied to Liothyris. Wheu young, and up to 

 a certain stage of its development, the loop is similar to that of Liothyris ; but with age 

 the crural processes become united and form a shelly band, which is never the case in 

 Liothyris. Apart from the last-named peculiarity of the ring-shaped loop, the subgenus 

 Terebratulina well defines a small group of shells distinguished and characterized by 

 the presence of ear-shaped expansions on each side of the umbo, and by the fine 

 radiatinii: striae that cover the surface of their valves. 



-'o 



11. Terebratulina caput-serpentis, Linne, .sp. (Plate III. fig. 11^ ; Plate IV. tigs. 1-11; 

 Plate V. figs. 32-34.) [Figs. 35-37, var. enumjinata, Ilisso=var. mediterranea . 

 Jeffreys. See footnote, p. 25.] 



Anomki capul-serpviitin, Liune, Syst. Nat. cd. duodecima reformata, vol. i. p. 1153, Holmia^, 1767. 



Anomia pubescens, id. ibid. p. 1153. 



Anomia retusa, id. ibid. p. 1151. 



Animal Anomia; nondum antea depidum, Ad. Murray, Fundamenta Testaceologiae, Upsala, \). I.'}, 

 pi. ii. fig. 23, 1771. 



Anomia caput-serpentis, Pennant, (Linn^) Nova Acta Regiae Societatis Upsaliensis, vol. i. \). .'58, tab. v. 

 fig. 4, 1773. 



Terehratula capiit-s-erpenfis (animal), Grundler, Naturforscher, Bd. i. p. 81, tab. iii. figs. 1-0, 1774; 

 Besehreibung mul Abbildung zweier natiirlichen Terebrateln, Naturf. Bd. ii. p. 80, 1774; Born, Musei 

 Csesarei Vindobonensis, ]>. 119, 1780. 



Anomia capvt-serpentis, Chemnitz, Conchylieu-Cabinet, vol. viii. p. 103, tab. 78. fig. 712, 1785. 



Terebrutula pubescens, Retzius, Nov. Gen. xv., 1788. 



Terehratula caput-serpentis, Dillwyn, Cat. Recent Shells, 1817 ; Lamarck, An. sans Vert. p. 247, 1819. 



Terebralula aurita, Fleming, Phil, of Zool. ii. p. 498, tab. iv. fig. 5, 1822, and History of British 

 Animals, vol. i. p. 3()9, 1828. 



SECOND SERIES. — ZOOLOGY, VOL. IV. 3 



