134 PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



Geological age. — Cretaceous (Campanian). 



Locality. — Pondoland (UmtamvunaKiver district), South-East Africa. 



Collection.— 'S>vii\sh. Museum [L. 8644]. 



IxocERAMirs sp. 



Inoceranms sp., Yokoyama : Palseontographica, 1890, vol. xxxvi, 

 p. 175, pi. xviii, fig. 6. 



An excellent figure of another internal natural cast of Lioceramus, 

 said to have affinities with Mantell's /. Cripsi and showing similar 

 rounded cavities between the grooves, has been published by Professor 

 Yokoyama, from the Senonian of Japan. The author regards the 

 pittings as the result of disease, without mentioning that they originated 

 from the former presence of pearly protuberances on the inner surface 

 of the valves. This specimen is a left valve having a length 

 measurement of 120 mm. 



Geological age. — Cretaceous (Senonian). 



Locality. — Near TJrakawa, Japan. 



Inoceramus sagensis, D. D. Owen, var. quadrans, E,. P. Whitfield. 



PI. IV, Pig. 4. 



Lnoceranius sagensis, var. quadrans, Whitfield : Mon. United States Geol. 

 Survey, 1885, vol. ix, p. 79, pi. xiv, fig. 16. 



" The middle of the cast, for about two-thirds the width, is marked 

 by strong, rather deep pits, connected by shallow furrows, showing 

 that the interior of the shell was covered by strong pearl-like pro- 

 tuberances, which progressed with the growth of the shell as does 

 a muscular scar, and I presume they were connected in some way with 

 the vascular system as were the lines of dots or interrupted striae on 

 other species of the genus." 



According to this statement Professor Whitfi^eld appears to regard 

 these perlaceous remains as part of the animal organization, and 

 related in some way to the vascular system, but if we accept the view 

 referred to by Mr. W. S. Dallas (Ann. Mag. Nat. Hist., 1 858, vol. i, p. 95) 

 that pearl-structures are abnormal growths brought about by certain 

 causes unconnected with the mollusc itself, it is manifest that the 

 former idea as to the origin of these bodies must be cancelled. 

 Judging from Dr. Whitfield's figure, the dimensions of this specimen 

 show a length of 103 mm. and a height of 85 mm. 



Geological age. — Cretaceous (Senonian : Lower Marls). 



Locality. — Near Burlington, New Jersey, United States. 



Inocekamus labiatits (Schlotheim). PI. Y, Fig. 1. 



Ostracit, Knorr: Die Naturgeschichte der Yersteinerungen, 1768, 



vol. ii, p. 84, pi. B ii, 5**, fig. 2. 

 Ostraciies lahiatus, Schlotheim: Taschenbuch Mineralogie, 1813, 



vol. vii, p. 93. 

 Mytulites problematicus, Schlotheim : Die Petrefactenkunde, 1820, 



p. 302. 



