402 071 the Palcvozoic Bivalved Entomostraca. 



is y^o ij^cli long, and ^i high (wide). A similar form occurs 

 iu the Skiddaw Slates '^. 



EXPLANATION OF PLATE XV. 



Fig. 1. Entomis tuherosa, Jones. Magnified 2 diameters. From a gutta- 

 percha cast of a natural impression of the two valves, misshapen 

 by pressure. Upper Silurian ; Pentland Hills, Scotland. 



Fig. 2. Entomis deja-essa, Salter, MS. X 2 diam. Liternal cast of a pau* 

 of open valves, rather compressed. From the Aymestry Lime- 

 stone ; Mocktree, Shropshire. 



Fig. 3. Entomis depressa, Salter, MS. X 2 diam. a. Liternal cast of a 

 pair of half-opened valves ; b. Profile of one of the valves. From 

 the Upper Ludlow ; Aymestry Common. 



Fig, 4. Bolbo^oe divisa (olim Entomidella divisa), Jones. Natural size. 

 a. Liternal cast of the two opened valves, rather flattened ; b. 

 Profile. From the Upper Ludlow of Cwm Craigddhu, Builth. 



Figs. 5fQ,7. Entomis ttibet'osa, Jones, X 2 diam. Liternal casts. Figs. 5 

 and 6, single valves ; 7, a pair of valves : all misshapened by 

 crush. Upper Silurian ; Yarralumla, New South Wales. 



Fig. 8. Entomis Marstoniana, sp. nov. Natural size. Two pairs {a & ft) 

 of valves spread open, lying side by side, and flattened. Lower 

 Ludlow ; Mocktree. 



Figs, 9, 10. Eiitomis Hasioelliana, sp. nov. 9. Internal cast, x 2 diam. ; 

 10. The central part of another specimen, showing very fine lines 

 radiating across the lower part of the sulcus, X 2 diam. Upper 

 Silurian ; Pentland Hills. 



Fig, 11. Entomis globidosa, Jones. Internal casts. X 2 diam. a. Left ? 

 valve ; b, central portion, x 4 diam. ; c, dorsal view ; d, ventral 

 view ; e, end view. 



Fig, 12. Entomis globulosa, Jones. X 4 diam. Internal cast of a valve 

 so much squeezed as to have had its dorsal sulcus made parallel 

 with the long axis of the fossil. Upper Silurian ; Girvan, Ayr- 

 shire. 



Fig, 13. Entomis globulosa (?), Jones. X 2 diam. Internal cast of a 

 conical valve, probably having relationship with the foregoing- 

 figs. 11 and 12. a, right ? valve ; b, ventral view ; c, end view, 

 the anterior ? extremity. Upper Silurian ; Pentland Hills. 



Fig. 14. Entomis Angelini, sp. nov. Nat. size ? Copied from fig. " 10 '' 

 of Augelin's unpublished plate " Tab. A," of Upper- Silurian 

 Bivalved Entomostraca. a, left valve ; b, edge view. From 

 Gothland ? 



Figs. 15, 16, 17. Eolbozoe scotica, sp. nov. Nat. size. Internal casts, 

 showing three stages of growth. Upper Silurian ; Pentland 

 Hills. 



Fig, 18 {a,b, c, d). The internal cast of a Cypridinal (?) valve, accom- 

 panying figs. 6, 6, and 7. The inner figure and profiles are of 

 the natural size ; the outline surrounding the valve shows it 

 magnified 2 diams. 



Fig. 19, Entomis impeiulcns, Haswell. X 4 diam. Internal cast. Upper 

 Silurian ; Pentland Hills. 



* Catal. Pal. Foss. M. P. G. 1878, p. 19 (JV tablet bears one specimen 

 of this species) ; and one occurs in similar rock in the British Museum 

 (Nat. Hist,), "no. 421G2." They differ somewhat in size. 



