﻿BRITISH FOSSIL CEPHALOPODA. 197 



Relations. — Belonging to the series having a generally elliptic shape, and there- 

 fore easily confounded with G. ellipticum, the aperture separates it from this and 

 all others, except G. pollens (Barr.), to which it is no doubt closely allied. That 

 species, however, is characteristically ornamented with strong upward imbricating 

 bands, of which there is no trace in our specimens. 



Distribution. — In the Lower Ludlow of Leintwardine (2) and Usk (1). 



G-omphoceras cinctum, Blake, PI. XXIII. figs. 5, 5a. 



Type. — Section elliptic ; diameters in the ratio of 16 to 13. General outline 

 straight with little convexity, like, two cones with their bases opposed. The septate 

 portion increases in its long diameter at the rate of 1 in 2. The greatest thickness 

 is at the last septum, from which the body-chamber contracts again at the rate of 

 2 in 3. There is a constriction at the base of the body-chamber and another round 

 the aperture, which is not well shown, but the dorsal opening of which appears to 

 have a simple elliptic outline. Septal characters not seen. Length, 2| inches ; 

 greatest diameter, 1^ inches. From the Lower Ludlow rocks, Ludlow. In the 

 British Museum. 



General Description. — To an elliptic section and conoidal form, which it has in 

 common with others, this unites a rapid tapering to a small apex. The aperture 

 is not well preserved in most, but in one larger than usual the dorsal aperture is a 

 transverse ellipse, and the ventral one is on the slope, elongated in the contrary 

 direction, very much as in G. ellipticum. The constriction at the base of the body- 

 chamber is seen in another example, and the same rate of increase in the earlier 

 portion. The septa have little convexity, and are distant -^ the greatest diameter 

 apart, and the last has half the usual size. The siphuncle is not more than \ the 

 diameter from the ventral side (fig. 6). The largest seen has a diameter of 

 2 inches. 



Relations. — This species is near to G. corona by its general shape and flatness of 

 the septa, and perhaps, also, the smallness of its aperture ; but the tapering here is 

 much more rapid. By its rapid decrease to the aperture it approaches G. microstoma 

 (Barrande), but there is no reason to believe that the ellipticity of our species 

 is due to compression, as they are found with the same characters in different 

 localities. 



Distribution.— In the Wenlock Limestone? Dudley (1), Ledbury (2), and 

 Malvern (1); in the Lower Ludlow of Ludlow (1), Leintwardine (3), and 

 Dudley (1). 



Gomphoceras neglectum, Blake, PI. XXIII. fig. 3. 

 Type. — Section elliptic ; the diameter in the ratio of 25 to 23 ; the long diameter 

 in the plane of symmetry. The general shape is straight, there being an equal 



