




12 MIDDLE CAMBRIAN. 
(Case and Reterenee co McCoy's Names and References; Observations, &c. Localities and Numbers. 
Drawers: Synopsis : and Figures of Genera. 
Gh Olenus (Spher.) sp. Carreg wen, Borth. (Mr. 
D. Homfray.) 
Gh | Olenus (Spher.) alatus, Boeck (ib. pl. 8, fig. 6). | Carreg wen, Borth. (Mr. 
Head spines remarkably curved in this | Ash.) Malvern, Mr. Sy- 
species. monds. 
Gh The typical number of body | Qlenus (Spher.) expansus, n.sp. A very nar- | a. 275, Moel Gron. (U. 
segments in the higher forms row axis and enormously wide flanks dis- | Ling. flag.) Mr. Plant. 
is 10—13, but these genera tinguish this. 
have usually more, and the 
Gh | primordial trilobites are ge- | Qlenus (Spher.) humilis, Phillips (ib. pl. 8, | a. 273, Moel Gron, Upper 
nerally of extravagant forms, figs. 9,10, 11). Only 7 body rings. The | Mawddach. (Mr. Plant.) 
or else of very simple struc- most minute species known. Extremely | a.23, Malvern Black Shales. 
ture. common at Malvern. (Mr. Symonds.) 
Gh | Olenus (Spher.) sp. Malvern. (Mr. Symonds.) 
Gh | Olenus (Spher.) bisulcatus, Phillips (ib. pl. 8, | Malvern. Rev. W. Sy- 
fig. 6). The body and tail of this species, are | monds. 
known, but are not in this collection. 
Gh | Olenus (Spher.) sp. like O. bisulcatus. b. 281, Rhiw felyn, Upper 
Mawddach. (Mr. D. Hom- 
O. Pecten. fray.) 
Gh Olenus (Spher.) pecten, Salter (ib. pl. 8, fig. 12). 
The most spinose and abnormal of all the | b. 308, Malvern. (Rev. W. 
British species. The cheeks are singularly | Symonds.) 
contracted : the tail 13-spined (Quart. Geol. 
Journ. XXI. p. 478). 
Gh Olenus (Spher.) sp. Carreg wen, Borth. (Mr. 
Homfray.) 
Gh | Conocoryphe? ecorne, Angelin? (Acerocare ec. | b. 259. Penmaen Pool, 
Pal. Suec. xxv. fig. 10). If this be Angelin’s | Dolgelly (Middle Lingula 
species, which seems likely, Acerocare is a | flags. Mr. Plant). 
needless name. 
Gh | Conocoryphe Williamsoni, n. sp. A tumid front, | b. 292, Rhiw felyn. Up- 



spinose cheeks, and pointed bent pleure, 
distinguish this. 

per Mawddach. (Mr. D. 
Homfray.) b. 258, Pen- 
maen Pool, Dolgelly. (Cast) 
Mr. Plant. 
