a 
C. Liostomia, G. O. Sars. 
42. eburneum, Stimps. 44. pistillus, Brugn. 
43. clavula, Loven. 45. electum, Jeffr. 
a. Ptychostomon s. str. 
Testa seulptura spirali omnino destituta, plieca distineta columellari munita, 
ß. Gruppe des Pt. conoideum. 
Testa conoidea, palato lirato vel dentieulato. 
1. Ptychostomon eonoideum, Broecchi, 
Taf. 66, Fig. 12—15. 
Testa subobtecte perforata, oblongo-conica, basi subattenuata, solida, subopaca, polita, praeter 
lineas incrementi subtilissimas ad peripheriam subangulatam linea impressa sculpta, eburnea. Spira 
attenuata, abrupte truncata, nucleo intorto, oceulto. Anfractus 8 planiuseuli, sensim erescentes, sutura 
angusta subcanaliculata disereti; ultimus dimidiam testae fere occupans. Apertura ovata, infra leviter 
expansa, '/; altitudinis aequans, labro externo regulariter arcuato, infra peripheriam inflexo, intus 
suleis 8-9 dentiforme terminatis interdum extus conspieuis munito, columellari reflexo, dente forti 
eonspicuo munito, supra ad parietem adnato. — ÜOpereulum crassum, sulco spirali profundo munitum. 
Alt. 5, diam. 2 mm, 
Turbo conoideus, Brocchi, Conch. foss. subapp. v. 2 p. 656 t. 16 fig. 2. — (Odost.) Forbes 
& Hanley, Hist. Brit. Moll. v. 3 p. 260 t. 98 fig. 4. — (Auricula) Philippi, Enum. Moll. Sieil. v. 2 
p- 119. — (Odost.) Jeffreys, Brit. Conch. v. 4 p. 127, v.5 t. 73 fig. 6. — Mörch, Syn. Moll. Daniae, 
in: Vedensk. Medd. For. Kjübenhavn 1871 p. 174 (18). — Jeffreys, Piedmont Coast Shells p. 32. 
— Sowerby, Ilustr. Index t. 17 fig. 8. — Fischer, Moll. Gironde 1865 p. 77. — Brusina, Contr. 
Fauna Dalm. p. 70. — Weinkauff, Mittelmeereoneh. v. 2 p. 218. — Aradas & Benoit, Conch. viv. 
sieil. p. 214. — Monterosato, Enum. e Sinon. 1878 p. 31. — Bucquoy, Dautzenberg & Dollfus, Moll. 
Roussillon p. 160 t. 21 fig. 1—3. — Jeffreys, Lightning & Poreupine, in: P. zool. Soc. London 1884 
p- 347. — Monterosato, Nuova Riv. p. 31. — Dautzenberg, Moll. Gabes, in: J. Conch. 1883 v. 31 
p- 314. — (Ptychostomon) Locard, Cat. general p. 231; Coq. mar. cötes France p. 149 fig. 129. — 
Locard & Caziot, Coq. Corse p. 45. — Watson, Moll. Madera, in: Linn. Soc. Journal Zool. 1897 
v. 26 p. 297. — Kobelt, Prodromus faun. mar. europ. p. 88. — Ülessin, in: Martini & Chemnitz, 
Conch. Cab. ed. 2 v. I 28 p. 100 t. 21.fig. 8. — Tryon, Manual ser. 1 v. 8 p. 349 t. 77 fig. 6. 
— Böttger, in: Verh. Siebenb. Ver. 1892 v. 50 p. 96. — Marshall, Addit. Brit. Conch., in: J. 
Conch. Leeds 1900 v. 9 p. 230. — Pallary, Moll. Oran, in: J. Conch. 1900 v. 48 p. 339. 
Odostomia plicata, Loven, Index Moll. Scand. p. 1. — Hanley, Brit. mar. Conch., Index 
p- 35 fig. 13. 
Schale fast überdeckt durchbohrt, oblong konisch, auch nach der Basis hin etwas ver- 
schmälert, festschalig, fast undurchsichtig, glatt, elfenbeinweiss, ausser den feinen Anwachsstreifen 
