14 SUPPLEMENT TO THE 



Genus — Terebratula, TJlmyd, 1699. 



4. Terebratula ? Newtoniensis, Bav. Dev. Mon., PI. I, figs. 10, 17 ; and Dev. Sup., 



PL I, fig. 6. 



One or two perfect specimens of this fine species have been found at Lummaton, 

 near Torquay, since the publication of my ' Dev. Monogr.' I now give a figure of a perfect 

 specimen in the possession of the Museum of the Natural History Society of Torquay. 

 Unfortunately, no duplicates were available for the Rev. Norman Glass's interior investi- 

 gation, and until its internal characters have been determined it will be impossible to 

 determine the genus to which it belongs. 



Ge7ius — Centronella, Billings, ISGl. 

 ("Devonian Possils of Canada West," 'Canadian Journal,' Maj', ISGl.) 



5. Centronella virgo, PJdllips, sp. Dav., Dev. Sup., PI. I, figs. 7, 8, 9. 



Terebratula vibgo, Phillips. Figures and Descriptions of the Palaeozoic Fossils of 

 Cornwall, Devon, and West Somerset, p. 91, 

 pi. XXXV, fig. 167, 1841. 

 — SAccuLus, Dav. Dev. Mon., p. 6 (not A. sacculus of Martin), 1864. 



Shell marginally ovate-lanceolate or longitudinally oval, longer than wide, contracted 

 anteriorly, straight or slightly indented in front, marginally rounded, broadest poste- 

 riorly ; beak acuminated, lanceolate, and prominent, slightly incurved ; foramen oval, 

 and widely separated from the hinge-line by a well-defined deltidium ; beak-ridges 

 sharply marked ; valves moderately convex without fold or sinus, ventral one somewhat 

 the deepest ; both valves deepest at their posterior half and near the umbo ; shell-surface 

 beautifully reticulated, or regularly marked with equidistant punctations and canals 

 in centrifugally curving lines; marked also anteriorly and near the margin by small, 

 undeveloped, rounded ribs. 



Length 7, breadth 5, depth 4 lines. 



In the interior of the dorsal valve two delicate ribbon-shaped lamellae, after origi- 

 nating from each extremity of the hinge-plate, extend to about two thirds of the length 

 of the valve. Close to their attachment thev widen into two short crura, with angidar 



