98 SYSTEMATIC ARRANGEMENT 



Genus 14.— Cyphaspis (Calymene, Roemer ; Phacops, Goldfuss). 



The cephalic shield is almost semicircular, but not quite so, the sides very much 

 produced, the margin thickened all round (and therefore excavated in casts) ; the glabella 

 very convex, resembling the half of an egg, without furrows, but furnished with two 

 longitudinal protuberances close to the narrower posterior extremity. The surface of 

 specimens in which the shell is absent is smooth, or very slightly granulated, but the shell 

 when preserved is thickly and strongly granulated. 



Eyes rather small, situated on high protuberances close to the glabella. The facial 

 suture intersects the anterior margin on a line with the eyes, thence proceeds in an almost 

 straight line towards the eye, from the posterior part of which it proceeds outwards, 

 and penetrates the posterior margin very near the external angle ; the latter is elongated 

 into a spine. 



Body rings eleven (or twelve ?) smooth and, in well-preserved specimens, finely 

 granulated ; the first five ai*e either furnished with a very pointed posterior angle, or 

 are rounded off ; the whole axis becomes gradually narrower towards the posterior 

 part. 



Caudal shield very small, with a short articulated axis, indistinct ribs, and a remarkably 

 depressed circumference, which is not reached by the ribs. 



Remarlis. — 1. The specimens upon wliicli this genus is founded, are rare aud well preserved. 

 The high glabella is usually entu-cly wautiug, but iudications of it may easily be discovered where it 

 was brokcu off. 



2. Dr. Loveu has described a Trilobite under the uame ot Proeius eleyantuhis {Ofvers K. V. A. 

 Foerh. 1845, p. 51, Tab. I, Fig. 4), which seems to belong to the genus Cyphaspis, or at least possesses 

 many of its characters ; it is said, however, to have twelve body rings. 



C. ceratophthalma : Scuto capitis antice rotuudato, glabella vakle iuflata, grosse granulosa ; 

 .annuUs tiuuci luulecim, anticis spinosis, oculis altissimis, couoideis. Loug. 1-1^". Tab. Ill, Figs. 

 3-4. 



S/f. — Phacops ceratojjhthalmus, GoLDF. Leonh. and Bronn. n. Jahrbuch. 1843. 365. 

 Tab. V, Fig. 2. Calymene hydrocephcda, Römer, Verst. d. Harzi/ehir(/es, 38. 4, Tab. 

 IX, Fig. 7. 



The cephalic shield is rather less than a semicircle, everywhere inclosed by a 

 thick margin, and elongated into a spine at the posterior angles. Immediately before the 

 spine a deep indentation is perceptible, the granulation then commences, and continually 

 increases towards the middle, so that the highest tubercles are placed in the centre of the 

 glabella. The latter, in point of form and convexity, may be compared to the larger half 

 of an egg. It rises from the cephalic shield, and is furnished at the posterior part with two 

 elliptical protuberances. The raised eye-tubercles correspond with the anterior extremities 

 of these protuberances, upon which the conical eyes are placed. The body rings are 

 very gibbous and finely granulated ; each of the latei'al lobes has a small indentation at 

 its extreme angle, and the first five appear to me to be acutely pointed. The short caudal 

 axis is three-jointed. 



Remarks. — 1. ^My figures were made up from five imperfect specimens, of which two are iu the 



