﻿CALYMENE. 91 



C. tuberculosa, Salter. PL VIII, figs. 1 — 6. 



Calymene Blumenbachii, var. tuberculosa, Dolman, p. 36? (not tab. 1, fig. 2). 



1826. 



— — — Hisinger. Lethsea Suecica, p. 10? (not 



tab. 1, fig. 3), 1837. 



— — Murchison. Sil. System, pi. vii, fig. 5 only, 1 839. 



— tuberculosa, Salter. Mem. Geol. Survey, vol. ii. pt. 1, pi. xii, 1848. 



— — Id. Decade 2, Geol. Survey, pi. viii, 1849. 



— — Id. Morris Catal. 2nd edit., p. 102, 1854. 



— — Id, Siluria, 1st ed., pi. xviii, fig. 11, 1854 (by acci- 



dent not introduced in the 2nd edit., 1859). 



— Blumenbachii, var. Hall. Pal. New York, vol. ii, pi. a 66, fig. 6 ? 1852. 



C. lata biuncialis depressa alutacea, nec tuberculosa ; margine frontali capitis valde 

 producto recurvo ; gcnis gibbosis, glabella brevi depressa. Thorax axe angusfo, pleuris 

 plants usque ad fulcrum, quod antice ad dimidium, postice ad tertium posilum est. 

 Cauda lata depressa, lateribus abrupte deflexis, axe conico subplano 7 — 8 annulato ; costis 

 lateralibus 5 planis, sulcis acutis hand interlineatis. 



If species be anything more than confirmed varieties, this is a good species ; and being 

 common in Shropshire, there is sufficient material to judge from. It is entirely different 

 in aspect from the common Dudley Trilobite, being greatly more depressed, and having a 

 projecting recurved snout, which distinguishes it at a glance. 



Our specimens are not more than 2^ inches in length, and in breadth inch. Whole 

 surface equally and minutely scabrous. General form broad for the genus, not much 

 attenuated posteriorly, depressed. Head short, wide ; the glabella not more prominent 

 than the cheeks, and much narrower, contracted in front, and separated by a deep furrow 

 from the front margin : it has three lobes on each side, the basal one large, the middle one 

 nearly spherical, the third minute ; the forehead-lobe is small, the neck-lobe large and 

 prominent. The neck-furrow is continued nearly to the posterior angles, which are 

 rounded. Cheeks gibbous, often more elevated than the glabella, bearing the small eyes 

 on their most prominent part. These are placed opposite the middle lobe of the glabella, 

 and at some distance from it. A strong deep furrow separates the cheeks from the 

 glabella, except opposite the eye, where a buttress is thrown across from the cheeks touch- 

 ing the middle glabellar lobe. The wings are strongly bent downwards, and even inwards 

 on the under surface of the head, and the anterior margin is much recurved, and produced 

 into a snout. On looking at the under view of the head, the margin appears greatly bent, 

 and in the angle so formed, the curved rostral shield, half as long as broad, is inserted ; 

 beneath this is attached the hypostome, which is squarish-oblong, with the terminal angles 

 rounded ; it is strongly convex forward, the convexity terminating in a compressed tubercle ; 



