Vol. 51.] RADIOLARIAN ROCKS IN THE LOWER CULM MEASURES. 651 



Leptcena analoga, Phill. PI. XXVIII. figs. 14 & 14 a. 



1836. Producta analoga, Phill. ' Geol. Yorks.' vol. ii. p. 215, pi. vii. fig. 10. 



1841. Leptasna , Phill. ' Pal. Foss. Cornw.' p. 56, pi. xxiv. fig. 93. 



1857. Strophomena rhomboidalis, var. analoga, Davidson, Pal. Soc. Mon.'' Carb. 

 Brach.' vol. ii. pt. v. p. 119, pi. xxviii. figs. 1, 2 ; Supplement, vol. iv. p. 291, pi. xxxvi. 

 fig. 23. 



1882. analoga, Kayser, Jahrb. d. konigl. Preuss. geol. Landesanst. f. 1881, p. 77. 



The specimen is rather smaller and finer than the usual forms of 

 this species, agreeing in these respects with the other Culm brachio- 

 poda. Length 4*5 mm., breadth 5*75 mm. 



Prom Hannaford Quarry, near Barnstaple, also from the Lower 

 Culm of Aprath. Phillips has figured it from the Devonian of 

 Croyde Bay, North Devon, and Davidson states that it is common in 

 the Carboniferous Limestone of Yorkshire, Derbyshire, Scotland, 

 Ireland, and Belgium. 



Orthotetes crenistria, Phillips, sp. PI. XXVIII. figs. 15 & 15 a. 



1836. Spirifer crenistria, Phill. ' Geol. Yorks.' vol. ii. p. 216, pi. ix. fig. 6. 



1857. Streptorhynchus , Davidson, ' Brit. Carb. Brachiop.' Pal. Soc. vol. ii. 



pt. v. p. 124, pi. xx vi. figs. 1-6, pi. xx vii. figs. 1-7. 



1874-82. , ibid. vol. iv. p. 288, pi. xxxvii. figs. 1-5. 



1882. , Kayser, Jahrb. d. konigl. Preuss. geol. Landesanst. f. 1881, p. 77, 



pi. iii. fig. 12. 



A specimen of the ventral or peduncle-valve and the internal 

 cast, showing median septum and four muscle-scars. Common. 

 Length 7*5 mm., breadth 6 mm. The specimens are small, but 

 even smaller occur in the Lower Culm of Aprath. 



Prom quarries at Hannaford and Codden Hill, near Barnstaple. 

 It has a wide distribution in the Carboniferous Limestone of York- 

 shire, Scotland, Ireland, Belgium, etc. 



Spirifer, sp. PI. XXVIII. figs. 16 & 16 a. 



Two specimens of internal casts of the dorsal or brachial valve 

 clearly belong to this genus, but are not sufficiently preserved to be 

 referred to any species. They do not, however, appear to belong to 

 any species hitherto described from the Culm or to any Carboni- 

 ferous Spirifer figured by Davidson. The approximative propor- 

 tions are : — height § width ; hinge f width of shell. The brachial 

 valve shows a wide median rib about 5 width of shell. On either 

 side are 4 or 5 radiating ribs, which gradually diminish in width. 

 The area of the valve appears to have been fairly pronounced, and 

 marked with horizontal and vertical striae ; its hinge-margin was 

 crenulate. The interior shows a ribbed cardinal process and a fine 

 median septum. 



Prom Hannaford Quarry, near Barnstaple. 



Athyris, sp. PL XXVIII. figs. 17 & 17 a. 



In the absence of calcareous structures one cannot definitely say 

 whether this specimen belongs to the looped Dielasma or to the 

 spire-bearing Athyris, but on the whole the features that it 

 possesses in common with Athyris seem of more importance than 

 those which resemble Dielasma. 



From Hannaford Quarry and Overton Quarry, near Barnstaple. 



