
FFESTINIOG GROUP. 
OS 



Case and , 
Column of Reference oe MoCor's Names and References; Observations, &c. Localities and Numbers. 
Drawers. | ‘Synopsis: and Figures of Genera. 
Gh Conocoryphe (Conocephalus) invita, Salter (De- | Penmorfa church, Trema- 
Gh 
Gh 
Gh 
Gh 
G 
case and 
a 





_ Brachiopods, or Lamp-shells. 

As Lingula Davisii, Pl. 11, 
fig. 7; as LZ. ovata, Pl. 11, 
(Note. 
Not the original LZ. ovata— 
that name is retained for the 
And 
when distorted, as Tellinomya 
fig. 6, pp. 252, 254. 
Bala species, p. 254). 
lingula@comes, Pl. 1k, fig. 18. 

cade XI. pl. 7, fig. 6). This genus is one of 
those which unite the Oleni of the Middle 
Cambrian with the Calymenide of the Up- 
per Cambrian and Silurian beds. 14 body 
rings. 
Conocoryphe abdita, Salter, Mem. Geol. Surv. 
Vol. 11. pl. 5, figs. 13 and 15. 
Dikellocephalus celticus, (Salter, Mem. Geol. 
Surv. Vol. m1. pl. 5, fig. 22). A genus re- 
lated to Olenus, and yet differing from it by 
the expanded form and large tail. Pro- 
bably this form and D. furca of the Trema- 
doce Group belong to the genus Centropleura 
of Angelin. Several British and Swedish 
species are known. 
Dikellocephalus, sp. 
MOLLUSCA BRACHIOPODA. 
Almost all the species known of this order in 
the primordial group are the horny species, 
such as Discina, Lingula, Lingulella, Obolella, 
&e. One or two species of Orthis are all the 
calcareous hinge-bearing forms known. 
Lingulella lepis, Salter (Mem. Geol. Surv. Vol. 
I. p. 334, fig. 11. Davids. Sil. Brach. pl. 3, 
figs. 53—59). Lingulella differs from the 
modern Lingula by having a groove for the 
passage of the pedicle, else it is quite like it. 
Lingulella Davisii, McCoy (Davids. Sil. Brach. 
t. 4, figs. 1—16). The common Brachiopod 
of the Lingula flag: of all shapes according 
to the pressure of the rock. Its true shape 
is satchel-shaped (McCoy). It occurs both 
in the sandy middle portion of the Lingula 
flag, and in similar strata in the Tremadoc 
rocks. It occurs of smaller size in more 
slaty deposits, but its place in these is 
usually taken by the Z. lepis. 



doc., Upper Lingula flags. 
b. 290, 291, Carreg wen, 
Borth. [Mr. D. Homfray. | 
b. 284, Ogof ddu, as below. 
(Mr. D. Homfray.) 
Craig Ogof ddu, near 
Criccieth ; in upper Lingula 
flag. (Mr. Ash.) b. 282, 
specimens figured in Mem. 
Geol. Soc. Same locality. 
[Mr. D. Homfray.] 
Carreg wen, Portmadoc. 
(Mr. Ash.) 
Ogof ddu, Criccieth. (Mr. 
Ash.) b. 312, Dolgelly. 
Borth, Portmadoc. (Mr. 
Ash and Mr Homfray.) a. 
19, Said to be from E. of 
Nant-y-groes? a. 17, Pen- 
morfa, Portmadoe (as Tel- 
linomya). a. 20 (As ZL. 
ovata), Penmorfa. 
a. 264, Hafod Owen, Upper 
Mawddach R. (Mr. Plant.) 
