Palceozoic Bivalved Entomostraca. 399 



sinuous (not straight), and the central mark (muscle-spot) 

 differs in definition and neatness. Regarding specimens I. 

 and II. 2 as much modified by fossilization, and taking II. 1 

 as the type (so far as internal casts can serve), I think we 

 have in these specimens the remains of a globular bivalved 

 Entomostracan of the Entomis type ; hence I proposed to term 

 it E. glohulosa. It is quite probable, however, that the exterior 

 of the valve exhibited little or no furrow, and only a small 

 central pit. 



Some of the remarks on the German Devonian Entomidesj 

 in the Ann. & Mag. Nat. Hist. ser. 5, vol. iv., may be referred 

 to as illustrating certain conditions of these little Palgeozoic 

 fossils ; but we must add that fig. 16 of pi. xi. of that memoir, 

 however similar in general appearance to one of the Pentland 

 specimens, is not the same in actual condition, for it has been 

 decidedly squeezed up from its usual oblong-ovate to a sub- 

 globular form, with modified sulcus, pit, and cross-line ; whilst, 

 on the contrary, the tent-like Pentland fossil has its central 

 area, with circular border and vascular radii, perfect and un- 

 disturbed, and was accompanied by another highly conical or 

 subliemispherical specimen, and by several Entomides of 

 species different from the foreign forms. " Cypridina globulus,^'' 

 Richter, is Entomis serratostriata (Sandberger), shortened by 

 pressure, and thus squeezed into a globular form, and our 

 fig. 3 of pi. xi. has also been squeezed end on. 



We here figure (fig. 20), for comparison with fig. 13, one 

 of the little Lower-Silurian fossils called " IGytliere umhonata^^ 

 by J. W. Salter, ' Pala30z. Fossils Cambr. Mus.' 1855, 

 Appendix A, p. ii ; and described and figured by M'Coy in 

 the same work, p. 138, pi. 1 E. fig. 6, as a Phyllopod, with 

 an eye-spot on it — a feature which I do not at all recognize 

 in any of the specimens I have examined. This little Patella- 

 like fossil presents a seeming analogy, at first sight, to fig. 13 ; 

 but its zoological alliances are quite doubtful at present. It 

 is rather abundant in the Caradoc-Bala rocks of Pistyll Cwm- 

 llech, Llanfyllin, and at Bendy Cerrig, Llanwddyn. Mr. 

 Salter found it also in a bluish-grey schistose rock, belonging 

 to the Llandeilo Flags, at Moel-y-Garnedd, Bala. Morris's 

 Catalogue Brit. Foss. 1854, gives as its place, " L. Sil. Bala ; 

 Corwen ; Conway Falls ; Llanfurog." 



8. Entomis imperidens^ Haswell. (PI. XV. fig. 19.) 



Untomis impendens, Ha&vfeW, Silur. Formation Pentland Hills, I860, 

 p. 38, pi. iii. fig-, 11; Jones, Ann. & Mag. Nat. Hist. ser. 4, vol. xi. 

 1873, p. 415 ; H. Woodward, Catal. Brit. Foss. Crust. 1877, p. 120. 



This little Entomis was originally figured in a book of 



