TJie Lower Devonian Fauna of Torquay. 273 



well-preserved cast of a left valve from Kilmorie which is in the 

 Sedgwick Museum appears to be identical in every respect with the 

 shell figured by Freeh ^ as a young " Avicida-like" example from 

 the Taunus quartzite. The ligamental surface and posterior wing, 

 the typical high narrow swollen body, and the high incurved slightly 

 twisted beak are well seen in our specimen, and there are 2-3 low 

 rounded concentric growth-ridges near the margin. The species 

 does not appear to have been previously recorded in the Meadfoot 

 Beds. 



Dimensions. — Height (oblique), 22 mm. Ditto, to hinge-lme, 

 19 mm. Length of hinge-line, 10 mm. 



Horizon. — Meadfoot Beds. 



Locality. —Kilmorie (S. 72). 



Modiomorpha cf. mytiloides (Conrad). 



There is an internal cast of a complete shell from Kilmorie in the 

 Sedgwick Museum which may be compared with the American 

 species Modiomorpha mytiloides (Conr.)^ rather than with any 

 European form which has been described, though it resembles 

 M. elevata Krantz,^ M. pra^cursor Freeh,* and M. suhmissa Barr. 

 {as figured by Barrels '') in many respects. The obliquely suboval 

 or rather spatulate shape of the shell widening gradually to the end 

 of the hinge-line, the narrow projecting anterior pre-umbonal 

 portion, the situation of the umbo, the oblique course of the hinge- 

 line, the weak sinuation in the inferior margin, the faintness or 

 practical obsolescence of the umbonal ridge and the position of the 

 anterior muscle-scar are features which agree closely with the 

 above-mentioned American species. The internal cardinal thickening 

 of the valve, the position of the posterior muscle-scar, and the course 

 of the pallial line are of the usual type found in allied members of 

 the genus, us figured by Hall, but the teeth are not preserved in our 

 specimen, and the exterior of the shell is unknown. It has been 

 suggested by Williams and Ereger*^ that the lanceolate cardmal 

 escutcheon on the internal cast represents the convex base of an 

 internal ligament in spite of Halls' statement that the ligament 

 is external. 



Dimensions. — ^Length, c. 63 mm. Height (maximum), c. 34 mm. 

 Height at back, c. 20 mm. 



Horizon. — Meadfoot Beds. 



Locality. — Kilmorie (S. 73). 



^ Freeh, op. cit., t. vi, figs. 66, 6c. 



2 Hall, Palceont. New York, vol. v, pt. ii, 18S5, p. 277, pi. xxxvii, fig. 3 ; 

 pi. xxxviii, figs. 1-16. 



* Bcushausen, Abli. h. preiiss. ge.ol. Landcsanst., N.F., Heft xvii, 1895, p. 23, 

 t. ii, figs. 9-11. 



* Drevermann, PalceontoqrapJi . , xlix, 1902, p. 86, t. x, figs. 11-14. 



^ Barrois, Faune Calc. (VErbray, Mem. Soc. Geol. Nord, iii, 1889, p. 176, 

 pi. xii, fig. 2. 



« Williams & Breger, Prof. Paper 89, U.S. Geol. Surv., 1916, p. 218. 



VOL. LIX. — NO. VI. 18 



