116 THE CAMBRIAN, ETC. OF THE MALVERN HILLS. | | Feb. 1902. 
Hyoriruvs, sp.a. (Fig. 16.) 
A large imperfect pee (now lost) has the jouer eae 
raised into. a. blunt. keel, » which: 
Fig. 16.—Hyolithus sp. a. becomes less marked towards the 
Transverse section at the mouth. The transverse section some- 
smaller end. _ what resembles that of AH. mal- 
vernensis, but. the depth is -greater, 
the proportions of the vertical: and 
horizontal diameters being 1 to 1-4.: 
Indications of longitudinal and trans-: 
verse striation: are seen, as in- that 
species, but the angle of divergence 
(6°?) appears to be much less.’ Length | 
seen, 16 mm.; breadth towards the 
mouth, 4°7 mm. 
Occurrence: In the grey Hollybush Sandstone of Raggedstone 
Hill (M 439). : 
Hyoxiruvs, sp. 0. 
A large imperfect example. Length preserved, 9 mm.; breadth 
towards the mouth, not lessthan5 mm. Dorsal side (alone exposed ) 
showing, in addition to indistinct traces of longitudinal striation, 
five or six shallow longitudinal grooves, with intervening gentle 
ridges, impressed upon the internal cast. Angle of divergence, 
apparently 13° or 14°. __ } 
Occurrence: In the grey Hollybush Sandstone of Raggedstone 
Hill (M 443). | 
HYoLiruus PRIMZVUS, Sp. nov. (Figs. 17-24, p. 117.) 
Type-specimen (figs. 17 & 18).—Ventral side semicircular in 
section; dorsal side flat; lateral angles well-rounded.. Breadth 
towards the mouth, 3 mm.; length preserved, 63 mm. : proportion 
of vertical to horizontal diameter of the cross-section, 1: 1:4; angle. 
of divergence, about 10° or 11°; surface apparently nearly smooth, 
In a second specimen (fig. 20) the angle of divergence is 11°; 
the ventral side is raised into a median blunt keel ; PrORO THOM, of 
width to depth, 1: 1-4. 
In a third specimen (fig. 19), measuring about 3°25 mm. in 
breadth towards the mouth, the ventral side 1s more convex than 
in the two foregoing specimens, the proportion of depth to width 
being 1:1:4; and the dorsal side shows a very shallow median — 
depression. ; 
The ventral, and perhaps also the dorsal, side of the shell in this 
specimen exhibits faint indications of longitudinal and transverse. 
striation, seen also in several other imperfect specimens apparently 
belonging to the species under consideration. 
The foregoing specimens were all obtained from the grey Hollybush 
Sandstone (M 439, 443). Others, agreeing in form, were found in 
the Malvern Quartzite (M 244 ¢). Tn one (figs. 21-23), an internal ~ 
