Case and 
Column of 
Drawers. 
FFESTINIOG GROUP. 
11 

Gh 
Gh 
Gh 
Gh 
Gh 
Gh 
Gh 
Gh 


Reference to McCoy's 
Synopsis: and Figures of Genera. 
—— — 
Names and References; Observations, &c. 
Localities and Numbers. 


Typical Olenus. 

Spherophthalmus. 
Agnostus, sp. with narrow glabella. 
Agnostus, sp. undetermined. 
Olenus micrurus, Salter (Mem. Geol. Surv. Vol. 
Tit. 1866, pl. 2, figs. 5, 6. p. 800). Distinct 
by the body being attenuated behind, and 
by the small entire tail of two segments. 
Olenus Plantii, Salter, n. sp. An oval species 
much flattened and expanded. Mr. J. Plant, 
who discovered it, has distributed casts and 
photographs of this fine and well marked 
fossil. 
Olenus (Parabolina) spinulosus, Wahl. (Ange- 
lin. Pal. Suec. t. xxv. fig. 9). Only lately 
noticed in Britain. It is common, and 
known by the fringe of long spines, directed 
backwards, to all the body segments. O. ser- 
ratus, Salter (Mem. Geol. Surv. m1. pl. 5, figs. 
6, 7) is the same species. (O. comatus, Plant 
MSS.) e 
is a natural subgenus, the opposite of Spher- 
ophthalmus, in having the axis very broad, 
the cheeks small, and the head spines re- 
duced to zero. Decade 11, Geol. Surv. pl. 8. 
Olenus (Spherophthalmus, Ang.) flagellifer, 
Angelin (Salter in Decade 11, Geol. Surv. 
pl. 8, figs. 7, 8) O. flagellifer and O. alatus, 
pecten, hwmalis, bisulcatus, are members of 
the subgenus Spherophthalmus, in which the 
head is wide and short, and the globular 
eyes remote. Spherophthalmus is probably 
a very distinct genus. 

Olenus, small sp. like O. cataractes. See page 6. 
Olenus (Peltura) scarabeoides, Wahl. Peltura 

| Plant.) 
Carreg wen. (Mr. Homfray.) 
a. 269, do. 
(Mr. Plant.) 
a. 2638, Penmaen Pool, 
Mawddach valley, near Dol- 
gelly, middle Ling. flag. 
(Mr. Plant.) 
Casts from Craig-y-Dinas ; 
and a. 272, Moel Gron, Up- 
per Mawddach. (In Upper 
Ling. flag. Mr. Plant, 1869.) 
a, 276. Penmaen Pool, 
Mawddach R. (In Upper 
L. flag.) Mr. Plant. 
a. 261, Penmaen Pool, near 
Dolgelly (Mr. Plant). a.260, 
271, 277, Rhiw felyn, on 
the Upper Mawddach R. 
(Mr. Plant). b. 349, fine 
series, same locality. (Mr. 
D. Homfray.) 
b. 285, Rhiw felyn, Upper 
Mawddach. (Mr. D. Hom- 
fray.) a. 270, Moel Gron, 
Upper Mawddach. (Mr. 
Malvern Black 
Shales. (Rev. W. Symonds.) 
All in Upper Lingula flag. 
Carreg wen, Borth, Port- 
madoc, (Presented by Mr. 
Ash.) Black slates ot Up- 
per Lingula flag. b. 2838, 
same loc. Mr. D. Hom- 
fray (fig. in Decade 11). 
