116 Dr. F. R. Coivj^er Reed— 



affinities, this shell seems to resemble PI. conica Phillips/ of the 

 Carboniferous Limestone, which Mrs. Longstaff^ thinks may belong 

 to the subgenus Trechmannia rather than to Mourlonia sens. str. 

 The figure of a shell named PI. vittata Phill. by Holzapfel ^ also 

 bears a considerable resemblance to our specimen, and we may also 

 compare the species PI. (Mourl.) Cayeuxi Mansuy,^ described from 

 the Dinantian of Eastern Yunnan. 



Euo?nphalus cf. suhcircularis Mansuy. (PL II, Fig. 3.) 



Several specimens of small planorbiform shells, with an average 

 diameter of about 8 mm., may perhaps be compared with Mansuy's 

 E. suhcircularis ^ from the Carboniferous of Eastern Yunnan, 

 though there are many European species which may be allied. 

 The shell is coiled in a flat S23iral of 5-6 rounded whorls, nearly 

 subcircular in section and increasing very slowly in size, with a 

 submarginal carination on the upper surface dying out towards 

 the mouth. The spire is rather sunken, being slightly depressed 

 below the level of the outer whorl, and the open umbilicus is also 

 concave. Eather strong concentric striae cross the whorls. 



Helminthochiton cf. priscus (Miinster). (PL II, Fig. 4.) 

 There is one symmetrical sub-semicircular and subcorneal plate of 

 a species of HehninthocJiiton measuring 6 mm. in diameter, which 

 agrees in general characters with the anterior plate of H. jjriscus 

 (Miinst.) as described and figured by De Koninck.® The slightly 

 raised small median apex projects a little behind the angulated 

 posterior end, and from the apex there radiate on each side a pair of 

 submarginal fine straight grooves separating low rounded ridges. 

 A rather large crescentic shelly process or shelf projects at a lower 

 level behind the posterior end of the plate, and is crossed by 

 a narrow triangular fissure which is doubtfully an original feature. 



Parallelodon aff. corrugatus De Koninck. (PL II, Fig. 5.) 

 There is one right valve of a shell which is referable to the genus 

 Parallelodon, but like the other fossils it is badly preserved. In shape 

 it is transversely rhomboidal ; the inferior margin is gently sinuated ; 

 the posterior end is rounded-subtruncate ; the beak is broad, low, 

 obtuse, and situated at about one-third (or less) the length of the 

 shell ; and the surface is ornamented with very fine radial lines and 

 concentric growth-lines, the latter becoming stronger near the margin. 

 In length the valve is about 15'5 mm., and in height about 9'5 mm. 

 It appears to be allied to P. corrugatus De Koninck, as described 



1 Phillips, Geol. Yorks, vol. ii, 1836, pi. xv, fig. 22. 



2 Longstaff, Quart. Journ. Geol. Soc, vol. Ixviii, 1912, p. 303. 



3 Holzapfel, Palceont. Abhandl., vol. v, pt. i, 1889, p. 50, t. vi, fig. 14. 



* Mansuy, op. cit., vol. i, fasc. ii, pt. ii, 1912, p. 89, pi. xvi, fig. 7. 



* Mansuy, op. cit., vol. i, fasc. ii, pt. ii, 1912, p. 105, pi. ix, figs. 3a-3fl. 



6 De Koninck, Fauna Cain. Carb. Belg., vol. iv, 1883, p. 199, pi. 1, figs. 37-48 ; 

 pi. Ii, fig. 36 ; pi. liii, figs. 21-9. 



