KEUSS FOSSIL LEPADIDiE, O 



Oligocene strata of SoUingen, near Brunswick, namely, (1) ScalpeJ- 

 lum robustum, lleuss, closely related to S. Nauchaniim, Eeuss, from 

 the Upper Oligocene of Crefeld (Westphalia), and specifically distin- 

 guished by its lobe, above the vertex of the carinal valve, forming 

 with the longitudinal axis of the main portion of the carina an acute 

 (or, at most, a right) angle ; (2) FoUiclpes interstriatus, Eeuss, 

 known only by a scutal valve of remarkably elevated, trigonal form ; 

 and (3) Poecilasma dubium, Reuss, founded upon a carinal valve 

 differing from those of Sccdjpellmn and PoUicipes by its exclusive 

 upward growth, and from those of Anatifa by the breadth of its 

 upper end not allowing its insertion between the two lateral tergal 

 valves, as also by its truncated inferior extremity ; it is allied to 

 Poecilasma, Darwin, a genus not before known to occur in a fossil 

 state. Lepadidoi have hitherto only been found in Oligocene, Eocene, 

 and Pliocene deposits ; but Professor Reuss has found 4 species in 

 Miocene deposits. One of them is Scalpellum magnum,Woo(\., known 

 to occur in the English Crag, and lately found at Galles, near Bor- 

 deaux : two other species, PoUicipes deciissatus, Beuss, and P. undti- 

 latus, Eeuss, are known only by detached but well-preserved scutal 

 valves ; both are alHed to P. interstriatus, Eeuss, are analogous to 

 P. Guascoi, Bosq., and have been found in the Miocene plastic clay 

 of Mederlois (Lower Austria). A single tergal valve from the Mio- 

 cene strata of Podjarkow (Galicia), described as "Poecilasma miocenica, 

 Eeuss," is of considerable interest, as being the first undoubted fossil 

 remains of the genus Anatifa yet discovered ; it should probably be 

 ranked with Mr. Darwin's subgenus Poecilasma, on account of its 

 very short and inflected interior margin. Three species of Lepadidce 

 prevail among those of the Bohemian Cretaceous deposits ; PoUicipes 

 (jlaber, Eoem., is the most frequently difiiised among them, and nearly 

 the whole of its valves have been found. P. conicus, Eeuss, is 

 only known by a well-preserved carinal valve ; Scalpellum quadri- 

 carinatimi, Eeuss, by the same valve, just sufficiently preserved to 

 admit of generic and specific determination. Isolated tergal valves, 

 occurring in the " Planer " of Hundorf, may, with some doubt, 

 be referred to PoUicipes Bronni. The Upper Senonian Marls of 

 Nagorzano (Gralicia) contain remains of Lepadida;, among which 

 PoUicipes fcdlax, Darw. (a species of extensive range, as it has been 

 found ia contemporaneous strata of Limburg, Belgium, England, 

 Hanover, and Sweden), seems prevalent. Nearly the whole of its 

 valves have been found. PoUicipes glaber, Eoem. (a species of still 

 wider range, as it has been met with also in Westphalia, Bohemia, 

 and Saxony), is associated with P. faUax, although of scarcer occur- 

 rence. A new species, PoUicipes Zeidleri, Eeuss, only known by a 

 scutal valve very analogous to that of P. Danvinianus, Bosq., also 

 seems to be very rare. [Cou^fx M.] 



