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833 



TERTIARY FAUNA OF FLORIDA 



l\iiiopcii glyciiiiei-is Dean, Ann. Nat. Hist., viii., p. 562, pi. 50, 51, 1835. 



l\iiioptca arfticii Hanlcy, 111. Cat. Rcc. Sh., p. 18, pi. 10, tig. 43. 



/'tuiit/ui'ii iuir;',-t;icii var. lui/ui, Shy., Min. Conch., vii., p. I, pi. 610, tig. 2, anil 611, 



figs. I, 2, 1829. 

 I\iiiopii'a Mii/(f,-ii</<n-J/ii A. Adams, 1'. Z. S., 1854, p. 137 ; fn/i' \\ 'oodward, P. Z. S., 1855, 



p. 221 ; Reeve, Conch. Icon., xix., pi. vi., fig. 8, 1873. 



Pliocene of Italy and France ; Pleistocene of the boreal North Atlantic 

 and Pacific coasts ; recent in the Arctic and boreal seas of both hemispheres, 

 on the Pacific south to the Aleutians, and on the Atlantic in cold, deep water 

 to the Mediterranean. 



Panomya ampla Dall. 



l\im>pica iit>r-,','gica. Mi4d. (pars), Mai. Ross., iii., p. 78, pi. xx., fig. u, 1849; not of 

 Spcngler. 



Pleistocene of the North Pacific, Bering, and Okhotsk Seas, and recent 

 in the same region. 



This differs from /'. iwrvc^ica by its much more heavy and rude shell, 

 with a more expanded posterior region, and flatter, more irregular valves. 



Genus SAXICAVA Flcuriau d, IVlK-vuc. 

 //itr/,-//ti Daudin, in Hose, Conchy]., iii., p. 120, 1802; Koi*sy, Man., vi., p. 385, 1805; 



Lam., Hist. An. s. Vert., vi., p. 29, 1819 ; tiray, List of lint. Moll., Brit. Mus., p. 88, 



1851. 

 Xii.u'i'in'ii rieuriau, linll. Snc. I'hilom., No. 62, pp. 5, IO, 1802 ; Lain., An. s. Vert., v., 



p. 501, 1818. 



Shell small, irregular, very inequilateral, the young with a cardinal tooth 

 like Piiiwinya, the adult with the teeth obsolete; pallial line discontinuous, 

 siphons naked, slightly separated at the tips and in normal specimens com- 

 pletely retractile, shell burrowing, or nestling in gravel or broken shell, or 

 perforating rocks, corallines, or dead shells like pholads. Type, J/jw arctica 

 Li nne. 



It is unnecessary to repeat the formidable list of generic and specific 

 synonymes which the curious may find in Gray's List of British Animals, vii., 

 Mollusca, pp. 87-89, 1851. In this synonymy, which Dr. Gray separates into 

 two parts, allotting Sa.vicai'a to S. rngcsa and Hiatclla to .S". arctica (which is 

 the young of rugose?), he cites a rare memoir of Daudin's for the genus Hiatclla 

 dating two years before the proposal of Saxica-ra by Fleuriau. Hose and 

 Roissy do not refer to this memoir, but mention two species from Tranquebar 



