256 F. R. Coirpe)' Meed — On the Genus Conocoryphe. 



and not merely pointed as in that species. The eye is also smaller, 

 and there is no ocular ridge. There are seventeen body-segments 

 in the adult Sao, while in C. ? variolaris there are only thirteen 

 preserved, with traces of a fourteenth. The tuberculation bears, 

 however, a somewhat close resemblance, but this feature is not of 

 much importance in determining affinities. 



On the other hand, the lobation of the glabella corresponds -with 

 that described by Angelin ^ for Solenopleura, and there is also 

 a coarse though not so abundant tuberculation of the head-shield 

 in some of the Scandinavian species. The genal angles in Soleno- 

 pleura appear to have typically borne similar spines. The convexity 

 of the fixed cheeks which Matthew (op. cit.) emphasizes, also 

 existed in C. ? variolaris, as their cracked surface shows, and in 

 the type-specimen it is crushed in. The tubercle on the neck- 

 segment is also present as in Solenopleura. Though in the descrip- 

 tion of the species it is said the pleurae have pointed ends, yet in 

 the type-specimen they are certainly rounded so far as they are 

 preserved. 



On the whole, it does not seem to be unnatural to assign this 

 species provisionally to the genus Solenopleura. 



C. ? verisimilis, Salter (Mem. Geol. Surv., vol. iii, 1866, p. 308,- 

 pi. vi, fig. 13). — Brogger - has suggested that this species may 

 belong to Cyclognathiis ; but though the forward position of the 

 eyes seems to favour this view, the shape of the free-cheeks with 

 their pointed genal angles forbids its acceptance. The general 

 appearance of the form is that of an immature individual of 

 Angelina Sedgwicki; but it may be a distinct species. There are 

 only twelve body-rings instead of fifteen ; the genal spines are 

 much shorter, and the eyes are more forward and nearer the front 

 end of the glabella; but all these characters might be due to 

 immaturity. The pygidium is unknown, but the thoracic segments 

 have similar characters ; and it may be with much confidence 

 referred to the genus Angelina. 



C. vexata, Salter (Mem. Geol. Surv., vol. iii, 1866, p. 307, pi. viii, 

 fig- 7). — Though this species is obviously not a member of Cono- 

 coryphe as now defined, its true generic position is doubtful. 

 Perhaps it belongs to the Olenida^, but even this is uncertain. 



a viola, Woodward (Q.J.G.S., vol. xliv, 1888, p. 74, pi. iv).— 

 The figures and description of this form suffice to remove it from 

 Conocoryphe, sens, str., but its features, especially its facial sutures, 

 are so peculiar that a new generic title seems requisite. 



_ C. ^JVilliamsoni, Belt (Geol. Mag., Vol. V, 1868, p. 9, PI. II, 

 Figs. 7-11). — This species belongs to the Olenidae and probably te 

 the subgenus Paraholinella of the genus Olenus ; the course of the 

 facial sutures, the position of the eyes, and other characters of the 

 head-shield correspond, but only two pairs of furrows on the 

 glabella are described. The thorax rather more resembles that of 

 Olenus, sens, str., than that of Paraholinella, and the pygidium is 



^ Pal. Scand., 1854, p. 26. 



2 Die Silur., Etag. 2 ami 3 (1SS2), p. 111. 



