PLATE LXXXI. 
a. Cardinal area. pe. Pedicle furrow. 
cf. Closed foraminal tube (see p. 629). pl. Platform. 
el. Cardinal scar. pl’. Central ridge of platform. 
hh. Central muscle sear. s. Median ridge. 
i, Transmedian muscle scar. t. Cardinal process of dorsal valve (see p. 565). 
j. Anterior lateral muscle scar. vs. Vascular sinus. 
lk. Outside and middle lateral muscle scars. x. Cavity beneath platform. 
m. Muscle scars on front face of platform. 
SCHIZOPHOLIS RUGOSA Waagen (p. 609). 
[Pl. I, fig. 4e.] 
Ficunres 1, la, and 1b. Top, side, and back views of the type specimen, a ventral valve. Geol. Survey India Cat. 
No. 3/790. Specimen figured by Waagen [1885, Pl. LX X XVI, figs. 4a-d; and 1891, PI. II, figs. 12a-c]. 
lc. Exterior view of dorsal valve. Geol. Survey India Cat. No. 3/789. Specimen figured by Waagen [1885, 
Pl. LXXXVI, figs. 3a—b; and 1891, Pl. II, figs. 14a—b]. 
The specimens represented are all from Locality 357¢, Middle Cambrian, lower portion of the ‘‘ Neobolus beds”? of 
the Khussak group, in purplish-colored, fine-grained, micaceous sandstone near the fresh-water springs in a gorge above 
the salt mines at Kiura (Khewra), Salt Range, India. 
NropoLus wartut Waagen (p. 566). 
[Text figs. 47A-B, p. 567, and PI. I, figs. 3, 4,4a-b, 5, and 5a.] 
Ficure 2. View of a partly exfoliated ventral valve. Geol. Survey India Cat. No. 3/783. Specimen figured by 
Waagen [1885, Pl. LXXXYV, figs. 3a-b; and 1891, Pl. II, figs. 3a—b]. 
2a. Compressed ventral valve. Geol. Survey India Cat. No. 3/787. Specimen figured by Waagen [1885, 
Pl. LXXXVI, figs. la-b] as Davidsonella syuama, and [1891, Pl. II, figs. 6a—b] as Neobolus warthi. 
2b and 2c. Side and back views of a ventral valve showing supposed foraminal aperture. (See p. 566.) 
This shell is on the same piece of rock as the dorsal valve represented by figure 2d. 
2d. Exterior view of dorsal valve. Geol. Survey India Cat. No. 3/784. Specimen figured by Waagen [1885, 
Pl. LXXXYV, figs. 4a—b; and 1891, Pl. II, figs. 4a-b]. 
2e. View of the interior of a ventral valve. Geol. Survey India Cat. No. 3/786. Specimen figured by Waagen 
[1885, Pl. LXXXYV, fig. 5; and 1891, Pl. IT, fig. 3c]. 
2f. View of the interior of a dorsal valve, the type specimen. Geol. Survey India Cat. No. 3/785. Specimen 
figured by Waagen [1885, Pl. LXX XV, fig. 5; and 1891, Pl. I, fig. 4c]. 
2c, Enlargement of the posterior portion of figure 2f. 
2h. Front view of the process and platform shown in figure 2g. 
The specimens represented are all from Locality 357a, Middle Cambrian, lower portion of the ‘‘Neobolus beds” 
in purplish, fine-grained, micaceous sandstone at Jutana, Salt Range, India. 
DISCINOLEPIS GRANULATA Waagen (p. 664). 
Fiaure 3. Exterior view of the type specimen, a ventral valve, from Locality 357a, Middle Cambrian, lower portion 
of the “ Neobolus beds” in purplish, fine-grained, micaceous sandstone at Juténa, Salt Range, India. 
Geol. Survey India Cat. No. 3/792. Specimen figured by Waagen [1885, Pl. LXX XVI, figs. 6a-b; 
and 1891, Pl. II, figs. 16a—b]. 
3a and 3b. Back and side views of a ventral valve from Locality 357e, Middle Cambrian, lower portion of the 
“ Neobolus beds ” in purplish, fine-grained, micaceous sandstone near the fresh-water springs ina gorge 
above the salt mines at Kiura (Khewra), Salt Range, India. Geol. Survey India Cat. No. 3/791. The 
triangular space shown in figure 3a is not filled in with the shell; it isan open slit. Specimen figured 
by Waagen [1885, Pl. LX X XVI, figs. 5a—b; and 1891, PI. IT, figs. 15a-b). 
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