﻿DUMORTIERIA STRIATULO-COSTATA. 245 



name Bum. suevica y 1 and fig. 10 is Bum. Moorei. Bum. suevica, which apparently 

 differs from Bum. radians in nothing except the absence of a carina on the 

 ventral area, is the only one of these species which I am unable to record in this 

 Monograph. 



Bumortieria striatulo-costata is a rather scarce species ; and very rarely is it 

 found in anything like good condition. The type and var. a are characteristic of 

 the Bumortieria-beds (Jurense-zone) of the Cotteswolds ; while var. /3 belongs to 

 the Moorei-beds (Opalinum-zone), both in the Cotteswolds and in the south. Of 

 the type-form I have a few very inferior specimens from Buckholt Wood and the 

 Long Wood near Stroud, and from Wotton-under-Edge. Of var. a I possess 

 better specimens, which came from Penn Wood ; and of var. /3 I have fair 

 specimens from the Moorei-beds (Opalinum-zone) of the same locality, and from the 

 same horizon (Yeovil Sands) of Stoford (Yeovil Junction), Somerset. 



PI. XL, figs. 1, 2, show two views of a fine adult specimen of this species 

 (var. o) from Penn Wood, near Stroud. Figs. 3, 4, are inner whorls, to be compared 

 with Bum. prisca, to which they bear great resemblance; figs. 5, 6, are the same 

 with about half a whorl added, and they may be compared with Bum. Levesquei ; 

 while figs. 7, 8, illustrate the completed specimen, showing the assumption of 

 Grammoceratan-like characters. Fig. 9 is the suture-line taken from another 

 specimen. 



PL XXXVII, figs. 16, 17, illustrate two views of a specimen of var. fi from 

 the Dorset-Somerset district ; while PI. XL, figs. 10, 11, give two views of a 

 somewhat finer-ribbed Cotteswold specimen, of which fig. 12 is the suture- line. 



Dumortibria, sp. Plate XXXVII, figs. 18, 19. 



This specimen bears considerable resemblance to the specimen of Burn, 

 striatulo-costata depicted on the same plate ; but its ribs are more distant, its 

 whorls are more compressed, and its umbilicus, which is very flat, is a trifle larger. 

 The specimen is only in poor preservation, so that I cannot say much ; but it 

 seems to be distinct from any of the species of the genus. It was collected by 

 Mr. Darell Stephens, F.G.S., and is labelled " Yeovil Junction." Presumably it 

 came from the shell-beds of the Yeovil Sands, Moorei-beds (Opalinum-zone) . 



PI. XXXVII, figs. 18, 19, give two views of this specimen. 



1 " Polycnorphidse," p. 139 ; see also Dum. exigua, p. 252. 



