THE 



GEOLOGICAL MAGAZINE. 



NEW SERIES. DECADE IV. VOL. IX. 



No. IV.— APRIL, 1902. 



OIR-IG-ITsTJLXj .A-iaTXCLIES- 



I. — WooDWAKDiAN MusEUM NoTEs : Salter's Undescribbd 



Species. VII. ^ 



By F. R. CowpER Reed, M.A., F.G.S. 



(PLATE VII.) 



CEPHALOPODA. 



Tkochooekas spurium, Salter, 1873. (PI. VII, Fig. 1.) 



1873. Trochoceras spurium, Salter, n.sp. : Cat. Camb. Sil. Foss. "Woodw. Mus., 



p. 160 {a 466). 

 1882. Trochoee7-as striatum, Blake : Brit. Foss. Ceph., p. 222, pi. xxix, fig. 5; 



pi. XXX, figs. 3, 4, 4ff, ib. 

 1891. Trochoceras striatum, Foord: Cat. Foss. Ceph. Brit. Mus., p. 32. 

 1891. Trochoceras spurium, "Woods : Cat. Type Foss. Woodw. Mus., p. 131. 



Salter's original specimen comes from the Wenlock Shale, Builth 

 Bridge, and was described (Salter, loc. cit.) as having " much 

 narrower whorls than Phr. nautileum." The specimen consists only 

 of the greater portion of the outer whorl, including the body- 

 chamber, and it shows the aperture and ornamentation very well 

 preserved. It agrees with Blake's species Tr. striatum in shape, 

 rate of increase, characters of body-chamber and aperture, degree 

 of obliquity of the transverse ribs, their absence on the body-chamber, 

 the fine lines parallel to them on the rest of the whorl, the epidermids, 

 and the shape, position, and distance apart of the septa. The 

 stratigraphical horizon on which it is found is also the same, and 

 there can be no doubt that the species are identical, as they agree 

 in all the essential characters and even in every minute detail. 



Orthooeras fluctuatum, Salter. (PI. VII, Fig. 2.) 



1873. Orthoceras fluctuatum, Salter, n.sp.: Cat. Camb. Sil. Foss. Woodw. Mus., 



p. 37 (« 611). 

 1882. Orthoceras fluctuatum, Blake : Brit. Foss. Ceph., p. 122 (cf. 0. recticinctum, 



Blake). 

 1891. Orthoceras fluctuatum. Woods : Cat. Type Foss. Woodw. Mus., p. 129. 



Salter describes this species as possessing " coarser striae than 

 0. suhundulatiim, Portl., and apparently more bent still than in that 

 species." The single specimen (a 611) named by Salter comes from 

 the Lower Bala (Llandeilo) of Wellfield, Builth, and consists of 

 an imperfect external hollow cast of a portion of the shell, showing 



^ For previous articles see Geol. Mag., 1901, pp. 5, 106, 246, 355,- and 576; 

 1902, p. 122. 



DECADE IV. VOL. IX. NO. IV. 10 



