60 THE VOYAGE OF H.M.S. CHALLENGER. 



iu form. After careful study and comparisou with an extensive series of the New 

 Zealand types, I am led to the conclusion that Rhynchonella pixydata is merely a 

 local variety of Rhynchonella nigricans, in the same way as Terebratula septentrioncdis 

 is by the generality of malacologists regarded as a local variety of Terehrattdina capiit- 

 serpentis. Rhynchonella nigricans and its variety pixydata bear a close resemblance to 

 more than one Jurassic, Cretaceous, and Tertiary species of the genus, and a Rhynchonella 

 recently found by the Rev. J. E. Tenison Woods in the Tertiary rocks of Table Cape, 

 Tasmania, seems absolutely undistinguishable. It has received the MS. name Rhyn- 

 chonella coelata from Professor M'Coy, and described under that name by the Eev. 

 Tenison Woods in his paper On the Tertiary Deposits of Australia, and published in 

 the Proceedings of the Royal Society of New South Wales in 1877. 



Lingida, Bruguiere. 



Lingula anatinct, Lamarck (PL IV. figs. 15, 16). 



Rostrum anatis, Petiver ; Patella unguis, LinnEeus ; Mytilus lingua, Dillwyn. 

 Lingula anatina, Cuvier, Memoirs dii Museum, vol. i. p. 69, pi. vi., 1802. 

 Lingula anatina, Val. apud Lamarck, Anim, sans Vert., vol. vi. p. 258, 1819. 

 Lingula cJiemnitzi, Kust., vol. vii. pi. i. figs. 7-9, teste Hanley. 

 Lingula anatina, C. Vogt, Anafcomie der Lingula anatina, 1845. 

 Lingula anatina, De Blainville, Manuel, tom. li. fig. 3. 

 Lingula anatina, Dav., Ann. and Mag. Nat. Hist., vol. ix. p. 377, 1852. 

 Lingula anatina, G. B. Sowerby, Thes. Conch., voL i. p. 337, figs. 1, 2, 9, 10, 1846. 

 Lingula anatina, Eeeve, Conch. Icon., pi. ii. 



Lingula anatina, DaU, Am. Journ. of Conch., vol. vi. p. 155, 1870, and Proc. Phil. Acad. Nat. 

 Sciences, p. 203, 1873. 



Shell oblong, elongated, sides nearly straight and parallel ; valves very slightly 

 convex, and nearly straight in front, attenuated at the posterior extremities. Surface 

 smooth, colour bright green. Peduncle longer than the length of the shell, passing out 

 between the valves through a narrow channel in the hinge margin. Valves about equal 

 and moderately convex, slightly gaping at the beaks, most convex along the middle, some- 

 what flattened laterally. Dorsal valve a little shorter at the beaks than the ventral one ; 

 texture horny and calcareous, no calcified support for the labial appendages, the fleshy spiral 

 coils directed upwards. Length, irrespective of the peduncle, 38, width 17, depth 6 mm. 



Hcd)itat. — The late Dr Willemoes-Suhm, of the Challenger Expedition, in one of his 

 letters published in Siebold and KoUiker's Zeitschrift, 1876, mentions finding on the 

 beach at Zamboangan, Philippines, a Lingida {L. anatina) in hundreds, and that he gave 

 a doUar for a hundred. Three large bottles full were forwarded to me for examination, 

 collected by the Challenger Expedition, in sand at low water at the same place, on October 

 23, 1871, and February 1, 1875. These specimens, from 10 to 40 mm. in length, were of 



