Vol. 51.] EADIOLA.EIAN EOCKS IN THE LOWEE CULM MEASCTEES. 647 



Also an impression and counterpart and two rilievo tails are 

 before us from Hannaford Quarry. « 



None of these specimens call for special remark. They vary in 

 size, but agree very well with Ph. Gliffordi from the Lower Culm of 

 "W addon Barton. 



Phillipsia ? (larval form). PI. XXVIII. fig. 4. 



This little specimen, which is represented by the impression and 

 counterpart, exhibits the head-shield and pygidium with about 5 

 thoracic segments united together. The head-shield and pygidium 

 are semicircidar in outline, and the free cheeks are furnished with 

 short spines projecting slightly outwards, as in Ph. minor. 



The entire length of the specimen is 4-5 mm. and the greatest 

 breadth 4 mm. The thorax measures 1*5 mm. in length, and the 

 head and pygidium are each 1*5 mm. long. 



This is probably a larval form, but it would be unsafe to hazard 

 an opinion as to the species ; possibly it may be Ph. Cliffordi : the 

 pygidium has too round an outline for Ph. minor. 



The specimen is in a white siliceous rock from Hannaford Quarry. 



Griffithides acanthiceps, H. Woodw. PI. XXVIII. figs. 5 & oa. 



1883-84. ' Brit. Carbonif. Trilobites,' Pal. Soc. p. 32, pi. vi. figs. 2, 10, & 11, and 

 pi. vii. figs. 2 & 3. 



This specimen seems to agree best with Griffithides acanthiceps ; 

 it consists of the free cheek of the right side only, of which the 

 impression and counterpart are preserved 

 in a pale yellow shale (resembling rotten- Fig. 4. 



stone in friability). The facets of the eye 

 on the rilievo half, fig. 4 e, are exquisitely /"' \ 



preserved, but only faintly to be detected /',\ \K 



upon the counterpart. Length of outer // \ /\\ 



margin of head or cheek 18 mm., breadth // (i \ feAV e 



of margin of cheek 2 mm., breadth of // * J \f \\ 



cheek 6 mm., length of eye 2-5 mm., breadth / *<--'" ^^ \ 



of eye 1*5 mm. ; ( N M 



This species has hitherto been recorded if \\ 



only from the Carboniferous Limestone of ; j '•: 



Craco, near Grassington, Settle, Yorkshire, 



and Castleton, Derbyshire. "We are now able to record it from the 

 Lower Culm of Hannaford Quarry, near Barnstaple. Collected by 

 Mr. G. F. Tregelles. 



Griffithides longispinus, Portlock, 1843. PI. XXVIII. fig. 6. 



1843. Portlock, ' Geol. Rept. Lond.' p. 312°, pi. xxiv. fig. 12. 



1883-84. H. Woodward, ' Brit. Carbonif. Trilobites,' Pal. Soc. p. 36, pi. vii. figs. 

 5 a, b, c, & 6. 



This specimen, which is one of the most complete from the 

 radiolarian Culm of Codden Hill, has the head-shield, thoracic 

 segments, and pygidium preserved together ; they are, however, 

 unfortunately decorticated, so that the ornamentation of the surface 



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