DESCRIPTION OF THE FOSSILS. 
239 
O. annulatum. Sow. PI. XXI. fig. 9, 10. Bowes ; Ivulkeagh ; High- 
Green-wood ; Northumberland. 
Section a little oval ; siphuncle excentric toward the broader side ; shell marked 
with prominent annular ridges, and intervening waved striae, a. subcylindrical ; j8. 
conical ; y. conical and curved. 
O. rugosum. Flem. PL XXI. fig. 16. Northumberland. 
Subcylindrical (or suddenly tapering), with annular waved rather distant ridges, 
tuberculated by many longitudinal echinated lines. 
O. dentaloideum. Ph. PI. XXI. fig. 12. Bolland. 
Elongate, curved, with many small longitudinal ridges and furrows (less tapering 
than the next). 
O. Gesneri. Mart. XXI. fig. 6. Bolland ; Middleton Tyas ; Cum- 
berland ; Northumberland ; Derbyshire; Isle of Man. 
A curved conical shell, with about thirty longitudinal acute ridges and rounded 
furrows ; the section slightly oval, the siphuncle nearly marginal. 
O. paradoxicum. Sow. t. 457- Kildare. 
Figure arched ; section deltoidal, back concave, sides convex, latero-dorsal edges 
truncate, and margined by a dorsal and a lateral furrow ; delicate longitudinal striae on 
the back and exterior part of the side ; transverse stria' and sutures retroflexed on the 
back, siphuncle nearly central. 
REMAINS OF CRUSTACEA, 
TRILOBITES. 
The following species are apparently sufficiently related to the genus asaphus of 
Brogniart, to allow of being ranked with it, until the whole subject of these curious 
fossils shall be re-examined, and the numerous species mentioned by Dalman, Greene, 
&c. rigorously compared with those here produced and others which are to appear in 
Mr. Murchison’s expected volume. 
A. quadrilimbus. Ph. PI. XXII. fig, 1, 2. Bolland ; Ireland. 
Fig. 1. The head. Margin quadrato-carinate, minutely striated ; surface smooth; 
eyes very minutely reticulated. 2. Abdomen- 
A. obsoletus. Ph. PI. XXII. fig. 3 — 6. Bolland ; Kildare. 
Abdominal lobes ventricose ; transverse undulations obtuse ; surface smooth, with 
undulating lines ; the limb with oblique undulating stria; ; head finely striated in un- 
dulated lines, roundish and lumpy. 
A. granuliferus. Ph. Pl, XXII. fig. 7. Bolland ; Tyrone ; Florence 
Court. 
Surface very minutely granulated ; limb not striated. 
