﻿CALYMENE. 



101 



there is no appendix beyond it (see fig. 21). The side ribs arch widely out, and are 

 so strongly interlined throughout, as to give the appearance of having twice the proper 

 number of ribs. 



I have ventured to call fig. 24 the ? form, or it may stand for variety /3, fcemina. 

 All the characters are the same as those of the typical variety a, except the somewhat 

 broader axis. And such a difference we should be prepared to expect in Trilobites, for 

 nearly all, as Barrande has shown, have a " forme longue " and a " forme large." 



Accordingly, in our var. fcemina the general shape is rounder, and the glabella broader 

 and less pointed ; the axis of body and tail broader, and the proportion borne by them to 

 the sides consequently greater. But these differences do not constitute a distinct species, 

 and the general aspect is much alike in both forms. 



The labrum is oblong, twice as long as broad, with parallel sides. It has a narrow, 

 not extended base, and is concave under the front border, then very convex, and with a 

 blunt tubercle above the centre. Two small tranverse lobes lie beneath this, forming 

 a nearly continuous ridge, and the limb is tumid beyond as far as the base of the short 

 furcate terminal lobes. 



C. Baglei, Barrande, is a closely related species, the tail is especially like ; but Barrande's 

 figure and good Bohemian specimens in the British Museum show a species with more 

 remote eyes, and the axis of the tail yet narrower than in the British form (Barrande, 

 * Sil. Syst. Boheme,' PL XLVIII, fig. 49). It is an Upper Silurian fossil. 



Localities. — Llandeilo flags, near Shelve and Wilmington, Shropshire j Builth, 

 Radnorshire ; abundant. Lann Mill, near Narberth ; Abereiddy Bay, Pembrokeshire, 

 abundant. The species is not known beyond the British Isles, and appears to be very 

 restricted in its range. It has been found at Waterford by Major Austin. 



Such species as the above help to conduct us to the Conocephalidce, and show the 

 near connection of Calymene with that group. 



Calymene parvifrons, Salter. PI. IX, figs. 25 — 28. 



Calymene parvifrons, Salter. Appendix A, p. 3 of Pal. Foss. Woodw. Museum, 



2, pi. i f, fig. 7. 1855. M'Coy, ib., p. 167, pi. i f, fig. 7. 

 1855. 



— — Salter, in Morris' Catalogue, 2nd ed., p. 102, 1854. 



— — Id. Siluria, 2nd. ed., p. 53, fig. 4, 1859. 



C. biuncialis et ultra, convexa, sublavis ; capite subtrigono lato, fronte valde productd 

 tumidd elevatd, § glabella brevissima cequali, — hdc parabolicd quam longd latiore, lobis 

 tribus elongatis subradiatis. Genes valde convexa, glabellam latitudine - superantes ; 

 oculis prominulis remolis, subcentralibus. Thorax axe angusto, pleuris valde deflexis. 

 Cauda lata, axe convexo. lateribus valde decurvatis 5-costatis, omnino interlineahs. 



