1850.] FLETCHER ON DUDLEY TRILOBITES. 403 



both being included under the name Calymene variolaris, although 

 parts of his description appear to be applicable to either species*. 



Cybele punctata, Wahlenberg, sp. Pl. XXXII. figs. 1-5. 



Sir R. I. Murchison and Professor Burmeister were acquainted with 

 the caudal shield only of this trilobite ; and Dr. Buckland, in his 

 * Bridgewater Treatise,' appears to have repeated the figure given by 

 M. Brongniart, to which he has assigned the name of Asaphus 

 tuberculatus. 

 Synonyms. — Entomostracites punctatus, Wahlenb. 1821, Act. Soc. 



Sc. Upsal. vol. viii. p. 32. t. 2. fig. 1. 

 Calymene variolaris, Al. Brongniart, 1822, Crust. Foss. tab. 1. 



fig. 3 A. 

 Calymene punctata, Dalman, 1 828, Palsead. p. 47. tab. 2. fig. a-g. 

 Calymene punctata, Murch. Sil. Syst. pl. 23. fig. 8. 

 Asaphus tuberculatus, Bucld. Bridg. Treat, pl. 46. fig. 6. 



General form ovate ; length nearly twice the width ; head and tail 

 about equal, excluding the terminal mucro. Thorax nearly half the 

 entire length of the animal. Cephalic shield semicircular, but gib- 

 bous in front ; its posterior angles produced into extended spines ; 

 its length equal to about half its width ; its surface coarsely granu- 

 lated with large tubercles, each with a minute perforation or puncture 

 (Pl. XXXII. fig. 9 b), as first observed by M. Brongniart. 



Glabella pyriform and gibbous, overhanging the slight anterior 

 margin, nearly spherical in front, where it has a distinct border of 

 large tubercles (PL XXXI I. fig. 1), and narrowing backwards to half 

 its front width, its base being less than one-third of the entire width 

 of the head. 



Two or three large tubercles, arranged on each side of the lower 

 half of the glabella, occupy the situation of the lateral lobes, the fur- 

 rows between which are not visible ; the axal furrows are deep, curving 

 outwards in front, and thence confluent with the deep sulcation 

 which separates the cheeks from the margin of the head ; the latter 

 is broad, and its sides have two distinct rows of tubercles. 



The course of the upper part of the facial suture is not clearly in- 

 dicated in the specimens before me, but it probably runs below the 

 front margin, and parallel with the front of the glabella to the eyes ; 

 from thence its course is outwards to a point somewhat in advance 

 of the posterior angle of the cephalic shield. 



A flattened space bordered by a row of tubercles surrounds the 

 peduncular eyes, which are moderate in size, but prominent, and placed 

 considerably apart, occupying nearly the centres of the convex and 

 tumid cheeks ; the distance of the eyes from each other exceeds the 



* Brongniart's diagnosis, " angulis externo-posticis in mucrone productis ; " and 

 description of the cephalic shield, " sur leur angle exterieur une sorte d'appendice 

 qui se prolonge sur les cotes de I'abdomen, jusque vers la sixieme articulation," 

 are clearly applicable to the C. punctata. His description of the caudal shield 

 applies rather to C. variolaris, as he compares it with that of C. Blumenbachii. 



