CARBONIFEROUS BRACHIOPODA. 
281 
18. Syringothyris subconica, Martin, sp. Dav., Garb. Mon., p. 48, PI. IX, fig. 3; 
and Sup., PL XXXII, fig. 17. 
I can only repeat what I stated at p. 49 of my Monograph, namely, " I am far from 
satisfied that the specific characters or claims of this species have been clearly estab- 
lished ; " but to whatever species it may belong, it is, I think, evident that it should 
be placed in the genus or sub-genus Syrhigothyris. Some examples referable to this 
species were found by the late Mr. Carrington in the Carboniferous Limestone of 
Wetton ; and the Rev. Norman Glass has been able to develop the spiral appendages 
from a specimen found by Mr. Tym in the Carboniferous Limestone of Castleton, in 
Derbyshire, and of this we give an illustration in Sup., PI. XXXII, fig. 17. 
19. Syringothyris distans, sp. Dav., Garb. Mon., p. 46, PL VIII, figs. 1^ — 17; 
and Sup., PL XXXIII, figs. 4, 5. 
Spirifeka bicauinata, WCoy. Synopsis, pi, xxii, fig. 10. 
I can add nothing to the description I have given of the shape or exterior characters 
of this species ; but its intimate shell-structure has been shown by Prof. King to be 
perforated by minute canals, as in the case of cuspidata ; and Prof. L. de Koninck, in 
the 'Transactions of the Royal Society of Liege' for 1859, describes and illustrates a 
specimen of the interior of the ventral or larger valve, showing the pseudo-deltidiura, 
dental plates, and position of the transverse plate and tube ; of these features better and 
enlarged figures were subsequently published by myself in the ' GeoL Magazine,' vol. iv, 
July, 1867 but, as will be seen by comparing the interior of the same valve of 
S. cuspidata and 8. distans, the transverse plate and tube, although partaking of the 
essential characters of the genus in both species, difixsr in the last-named on account of 
the plate beginning much sooner or closer to the teeth, while in S. cuspidata it connects 
the dental plates lower down. 
8iih-geniis Cyrtina, Bav. 
Notwithstanding many attempts, I have yet been unable to find any trace of spiral 
coils in either Cyrtina sepdosa, Phillips, sp., or in C. carbonaria, but Prof. King 
^ We have reproduced these figures for reference in PI. XXXIII of this Supplement. 
