74 
Cryptonymus, Eichwald, 1840. 
Diagnosis: Head semi-circular; genal angles rounded, not produced 
into spines, as in E. punctatus. Glabella gibbous and overhanging, with 
obscure furrows. Eyes prominent; smooth. ‘Thorax with 11 segments. 
Pleurae without grooves, notched at ends. Pygidium triangular, con- 
vex, and rounded at the end, with 9-15 joints and few pleurae (7 or more). 
In typical Encrinurus punctatus, &c., the axial joints of the tail 
have a single row of nodes; in Cryplonymus variolaris, &c., the axial 
joints two or more rows. 
CRYPTONYMUS VARIOLARIS, Brong., Plate III, figs. 8-9. 
Not named Parkinson Org. Rem., vol. 3, plate 17, fig. 16. 
Illustrates a head and part of thorax, inflated glabella, with large 
tubercles. 
Calymmene yariolaris, Brong., Crust. Foss., p. 14, plate 1, fig. 3-b, not 3-a. 
—Miutrch., Sil. Syst., p. 655, plate 14, fig. 1 (entire). 
Cybele variolaris, Salter, Mem. Geol. Sur., vol. 3, plate 1, p, 344. 
fletcher, Quart. Jour. Geol. Soc., vol. 6, p. 403, plate 32, figs. 1-5. 
Zethus variolaris, McCoy, Pal. Foss. Woodw. Mus., p. 157. 
Encrinurus variolaris, Salter, Mem. Geol. Sur., Dec, 7; Encrinurus, p. 7, plate 
4, figs. 13 and 14. 
Cryptonymus variolaris, Vogdes, Mong. genera Zethus, &c., p. 21, plate 1, figs. 
6-10; plate 3, figs. 13-14. 
Description: Head triangular, gibbous, one-half as long as wide, 
tuberculated. Glabella gibbous and overhanging, spherical, with a short 
neck; the inflated glabella has not an anterior row of tubercles, as in E. 
punctetus. 
Glabella furrows obscured by the size of the tubercles. Eyes large, 
smooth. Occipital ring smooth. Genal angles rounded, with prominent 
tubercle in place of spine. Thorax with 11 segments. Pleurae without 
furrows and notched at ends. Pygidium with 9-12 axial joints; each 
joint frequently interrupted in the middle by one or two isolated nodes. 
Axial grooves distinct; not notched at their sides, as in /. punctatus. 
Pleurae 7, bent down; not spinous, but prominent at the ends; no termi- 
nal caudal spine. 
English species, Wenlock Limestone, &c., known as the Strawberry- 
headed Trilobite. 
CRYPTONYMUS EXPANSA, Haswell, Sil. For. Pentland Hills, p. 36, plate 
Ail Seu. 
Glabella pear-shaped, rounded in front, narrow behind, with 2 glabella 
furrows extending on each side one-fourth its width, studded with about 
28 small tubercles. Fixed cheeks, convex; triangular genal angles 
rounded; eyes lateral, projecting; thorax with 11 segments. Pygidium 
