40 BRITISH PALAZOZOIC FOSSILS. [Zoopuyta. 
Perrata BINA (Lonsd. Sp.) 
Syn. and Ref.—Turbinolopsis bina (Lonsd.) Sil. Syst. t. 16. bis f. 5, and 5 a, 
Sp. Ch.—Adult size of corallum, length nine lines, width six lines, slightly curved towards the apex, 
rapidly enlarging for the first three lines to a width of about the same; exterior marked with alternately 
larger and smaller lamellar strie; terminal cup (and cast) about one-fourth wider than long, obtusely 
conical, radiated with thirty to forty vertical rows of strong conical papillze, forming the primary lamelle, 
extending but a very short way towards the centre, leaving a corresponding number of large pits on the 
cast, about seven rows at the margin in a space of three lines; between these an equal number of rows 
of much smaller and less prominent papillee form the secondary lamellz, and secondary row of small pits 
on the casts; the larger papille about one-third their diameter apart, the smaller papillee (and pits) about 
their diameter (or rather more) apart. 
Position and Locality —Caradoe sandstone of Horderly; Malverns, Worcestershire. 
PETRAIA ELONGATA (Phill. Sp.) 
Syn. and Ref—Turbinolopsis elongata (Phill.) Pal. Foss. t. 2. f. 64. Sil. Syst. t. 16. dis f. 6. 
Sp. Ch.—Corallum regularly elongate, conic; casts conical, subtruneate at the smaller end, little wider 
than long; average diameter nine lines, marked with thirty-two to thirty-six strong primary lamelle 
extending nearly to the centre, where they are complicated in a cellulose mass; between each pair of 
primary sulci is a finer secondary one, pierced with tubular papillee (forming a row of pits on the cast) 
extending but a short way towards the centre, and reaching about four-fifths the length of the cast 
from the base towards the apex. 
The sixty-four or seventy lamellar sulci often seem nearly equal at the edge of the cup in strength, 
(six or seven in three lines at the above diameter) but only the secondary ones pitted. The pitting of the 
secondary lamellee, the greater coarseness of the ribs between the lamellar sulci, greater size, and greater 
number of the lamelle distinguish this from the P. subduplicata (M°Coy). 
Position and Locality.— Caleareous flags of Bala, Merionethshire. 
Petrarta RUGOSA (Phill. Sp.) 
Ref. and Syn.—Turbinolopsis rugosa. (Phill.) Pal. Foss. t. 2. f. 7. C. 
Sp. Ch.—Cast conical, marked with one or two large concentric undulations of growth; average diameter 
nine lines, height varying from one half to slightly more than the diameter, (the latter form being very young) 
radiated with about seventy sub-equal, strongly pitted lamellar sulci, nine or ten in three lines (at six lines in 
diameter) ; the primary extending but a short distance towards the centre, which is wide and obscurely 
cellulose, secondary rows and pits as broad as the primary, but merely marginal and reaching only about 
half way from the edge of the cup to the base. 
The close, equal, rows of large pits, of both the primary and secondary lamella, give a uniformly porous 
or cellular appearance to the casts of this species, totally unlike any of the others with which I am acquainted ; 
Prof. Phillips’s figure very imperfectly represents these peculiarities, although taking his description into 
account, there cannot be a doubt of the identity of the species. 
Position and Locality—Oceurring occasionally in the schists of Pen lar, Llandovery; Castel Craig, 
Gwyddon, Llandovery, Caermarthenshire ; and Peniarth. 
PEeTRAIA SUBDUPLICATA (M°Coy). Pl. 1. B. fig. 26. 
Ref—MCoy, Ann. Nat. Hist. 2nd Series, Vol. VI. p. 279. 
Sp. Ch.—Regularly conic, slightly oblique and curved at the tip, outer wall thick, marked with one or two 
small interruptions of growth, and with fine, longitudinal, distant impressed equal strize (seven in two lines at a 
