30 SECOND SUPPLEMENT TO THE CRAG MOLLUSCA. 



The specimen figured is from my own cabinet, and was found by myself. It appears 

 to answer to this species, though from being unique and imperfect, I give it with doubt. 



RISSOA RETICULATA, Mont. 2nd Sup., Tab. IV, fig. 19. 



A specimen with this name has been sent to me by Dr. Reed, which seems to corre- 

 spond with the recent British shell to which I have, as above referred, it. The shell so 

 called in ' Crag Mol./ vol. i, p. 163, tab. i, fig. 5, has been the subject of a criticism 

 not easily to be understood (see 1st Suppt., p. 73). I have therefore had the present 

 specimen figured, which is a more elongated form. 



HYDROBIA OBTUSA, Sandberger. 2nd Sup., Tab. IV, fig. 7. 



LITTORINELLA OBTUSA, Sandb. Conch, de Mainz Tertiarb., s. 81, taf. 6, fig. 8 a c. 



Length 1 line. 



Locality. Fluviomarine Crag, Bramerton. 



Several specimens of this little shell have been sent to me by Mr. Jas. Reeve, who tells 

 me that he found them at Bramerton, and was doubtful about their correct assignment. 

 The one figured is the longest of the series, and seems to approach very close to the 

 figure of the shell given by Dr. Speyer from the middle oligocene of Germany, under the 

 name of Bithinia obtusa, Sandberger ; and as the specimens show the same thickened lip 

 as does his figure, I have ventured to identify them with it. As the specimens are in 

 good condition, and the allied species subumbilicata, tkermalis, and ventrosa, which are 

 abundant and in very perfect condition at Bramerton, are also figured by Dr. Speyer 

 (under the name J2. acuta, Drap.) from the same middle oligocene beds, I am disposed to 

 regard the species now under description as having lived in the waters of the Crag 

 Period equally with subumbilicata ; and not to be of the derivative origin of the shells 

 described in the postscript. 



NATICA (AMATJROPSIS) JAPONICA ?, A. Adams, M.S. 2nd Sup., Tab. Ill, fig. 11. 



Axis J of an inch. 

 Locality. Red Crag, Butley. 



A small specimen is among the shells sent to me by Dr. Reed, with the above name 

 attached (by, I believe, Mr. A. Bell, who obtained it from Butley). 



It is in good preservation and I have had it here figured, but whether it be the shell above 



