602 MOLLUSCA SUB-KINGDOM VI 
Family 2. Chondrophoridae. Fischer. 
Proostracum much elongated, thin, composed of conchiolin or of alternating layers of 
calcareous and horny matter, thickened posteriorly, and without conical alveolar cavity. 
Jura to Recent. 
Coccoteuthis, Owen (Trachyteuthis, v. Meyer (Fig. 1256). Proostracum elongated- 
oval, composed of calcareous and horny laminae, rounded posteriorly or with but 
slightly projecting mucro; external surface roughly granulated, and marked by lines 
diverging from the apex. These lines limit the boundaries of two wing-like 
expansions projecting from the sides of the elongated median portion. Impressions of 
the body and arms occasionally found in the Lithographic Slates of Bavaria. Upper 
Jura. 
Leptoteuthis, v. Meyer. Proostracum very large, thin, narrowing posteriorly, and 
composed of several layers of calcareous and horny layers. Median area ornamented 
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Fic. 1258. 
Fic. 1256. Fic. 1257. Geoteuthis Bollensis, Zieten. 
Coccoteuthis hastiformis, Riipp. Beloteuthis Schuebleri, Quenst. Upper Lias; Holzmaden, Wiirtem- 
sp. Lithographic Slates; Hich- Upper Lias; Holzmaden, Wiir- berg. Shows ink-bag and cono- 
stadt, Bavaria. temberg. 1/, (after Quenstedt). thecal striae. 1/3. 
with fine undulating transverse striae, convex toward the front, and separated from the 
lateral areas by longitudinal lines diverging from the apex. Lateral areas marked 
with oblique inwardly directed lines, and bordered by lateral expansions which are 
widest posteriorly. Upper Jura of Southern Germany. L. gigas, v. Meyer. 
Geoteuthis, Miinst. (Fig. 1258). Proostracum composed of thin alternating horny 
and caleareous layers, widest in front, rounded posteriorly. Median area divided into 
halves by a longitudinal line, and bounded on either side by lateral areas with 
hyperbolic striae. Ink-bag frequently preserved, the contents transformed into a jet-like 
substance. It is possible to dissolve the carbonaceous particles so as to prepare a wash 
resembling India ink. Upper Lias of Germany, France, and England. 
Beloteuthis, Miinst. (Fig. 1257). Proostracum very thin, elongated, feather-shaped, 
