BRITISH FOSSILS. 



Decade XI. Plate IV. Figs. 1-6. 



.EGLINA BINODOSA. 



[Genus ^GLINA. Bareande, 1847. (Sub-kingdom Articulata, Class Crustacea. 

 Order Trilobita. Family AsaphidsB.* Body oblong, the extremities equal, rounded. 

 Head convex, glabella large, rounded or parabolic, not distinctly lobed ; eyes very large, 

 occupying the whole, or nearly the whole cheek, coarsely granulated (externally ?); facial 

 suture ending on the posterior margin close to the axis. No rostral shield. Thorax with 

 five or six rings, the axis broad, the pleurte facetted and grooved. Tail large, the axis of 

 two or three rings, abbreviated ; the sides few-ribbed, or nearly smooth. Cyclopyge, 

 Corda.] 



Diagnosis. lata, biuncialis et ultra, convexa, capite grandi inflato, 

 IcBvi ; segmento thoracis tertio binodoso ; cauda triangulata profimde 

 marginata. 



Synonyms, ^glina binodosa, Salter, Siluria, 2nd ed., p. 50, Foss. 

 8, fig. 6. Id. Mem. Geol. Snrv., vol. iii. ined., pi. 11b. fig. 3. 



The genus has been previously illustrated in Decade YII., but 

 from less perfect materials. 



Description. — About an inch long, and three-quarters broad in 

 the widest part ; the head very blunt in front, and the tail taper- 

 ing acutel}^ The glabella is round and inflated ; the axis of the 

 body tapers quickly backwards, and the tail is truly triangular. 

 These characters and the tubercles on tlie third body segment will 

 easily enable the collector to identify it. 



The head is seldom perfect, but, from many specimens, must have 

 been transverse-oblong, while the glabella is perfectly round, in- 

 flated, and showing no trace of lobes or furrows. It has a narrow 

 bordei* down the sides, marking the course of the facial suture, and 

 separating the glabella from the broad lunate eyes, which are 

 coarsely granular (fig. 8) and occupy the whole cheek. As usual in 

 the genus, the infla^ted glabella shows no trace of a neck segment. 



* For the present I do not wish to cut up this large natural group. But a better 

 knowledge of the primordial forms of it will doubtless render it necessary to do so bye and 

 bye. JEglina has some relation to Bemopkundes (Olenidce). 



[xi. iv.] 11 D 



