﻿TEXTULARTA. 



135 



Characters. — " Shell conical, somewhat flattened on two of its sides ; its horizontal 

 section oval; composed of nine snbglobose cells ; sutures deeply sulcated. Length thick- 

 ness inch," (0*85 mm.— 0*18 mm.). 



I have never had the good fortune to meet with this species, though I have at one 

 time or other searched large quantities of the magnesian limestone debris from the 

 locality (Byers Quarry) whence Prof. T. Rupert Jones's specimens were obtained 

 five and twenty years ago. It is much to be regretted that the original examples 

 have been mislaid or lost. Under the circumstances the only course left for me has been 

 to reproduce the description and figure as given in Prof. King's Monograph. 



Dr. Richter, of Saalfeld, describes and figures {toe. cit.) specimens which he regards 

 as pertaining to the same species, from the Zechstein formation of Germany, thereby 

 contributing to its better definition. His description, which does not entirely accord 

 with that quoted above from Prof. Jones, runs as follows. " This also is one of 

 the compressed forms like the foregoing (T. cuneiformis), and is always found split on 

 the median plane. Narrow wedge-shaped, somewhat smaller than T. cuneiformis} the 

 relation of length to breadth is as 100 to 5 5. The scarcely alternating chambers are 

 thick-walled, equal in height and length (only the latest chambers are sometimes rather 

 shallower), concave and smooth." The length of the Zechstein specimens appear to be 

 about -^5 inch (1*0 mm.). Through the kindness of Dr. Richter I am enabled to give a 

 better figure of the species than that which accompanies his own description : PI. X, 

 fig. 25, is an accurate copy of the drawing of a Thuringian specimen in his cabinet. The 

 chambers are rather longer in proportion to their depth than the previously published 

 figures indicate, but the general characters accord with Dr. Richter's description above 

 quoted. These German examples appear to be much more regularly built than that to 

 which the name was originally applied, but beyond this fact, which is apparent from a 

 comparison of the figures, the available materials leave little scope for comment. 



Distribution. — In the Upper Magnesian Limestone, Byers Quarry, Durham ; in the 

 dark-grey Lower Zechstein Limestone of Thuringia and possibly in the Middle Zechstein 

 also. In all localities very rare. 



Textularia multilocularis, Reuss. PI. X, fig. 23. 



Textularia multiloculabis, Reuss, 1861. In Geinitz's Dyas, Heft i, p. 122, pi. xx, 



fig. 38. 



Dr. H. B. Geinitz in his great work on the Permian formation (toe. cit.) figures, on the 

 authority of the late Professor von Reuss and from his drawings, an attenuated Textu- 

 1 Textularia cuneiformis is T. Jonesi of the present memoir. 



