172 ORGANIC REMAINS. 



Oxygonae. Gervillia, 1, aviculoides, coralline oolite and calcareous grit; 



2, acuta, Brandsby slate ; 3, lata,* inferior oolite. 

 Avicula, 1, elegantissima,* 2, tonsipluma,* coralline oolite ; 3, ova- 

 lis,* coralline oolite and calcareous grit ; 4, expansa,* coralline 

 oolite, Oxford clay, and Kelloways rock ; 5, Braamburiensis, 

 Kelloways rock and Bath oolite ; 6, insequivalvis, iiiferior oolite 

 and marlstone ; 7> like echinata, lias. 



Pectenidae. Plagiostoma, 1, giganteum, inferior oolite and lias ; 2, rusticum, 



lias and coralline oolite ; 3, pectinoideum, tipper lias ; 4, laevius- 

 culum, 5, rigidum, coralline oolite ; 6, rigidulum,* cornbrash ,- 



7, Oxford clay, 8, cardiiforme ? 9, Bath oolite ; 10, duplicatum, 

 coralline oolite, Oxford clay, and Kelloways rock ; 11, interstinc- 

 tum,* cornbrash and Bath oolite. 



Dianchora striata, chalk. 



Lima, 1, rudis, coralline and Bath oolite and calcareous grit ; 2, pro- 

 boscidea ? inferior oolite. 



Plicatula spinosa, lias. 



Pecten, 1, sequivalvis, 2, sublaevis, marlstone series ; 3, inaequicos- 

 tatus,* 4, vimineus, 5, cornbrash and coralline oolite ; 6, vagans, 

 coralline oolite and calcareous grit ; 7 fibrosus, Kelloways rock ; 



8, virguliferus,* inferior oolite ; 9, abjectus,* Bath and coralline 

 oolite ; 10, lens, coralline oolite, Kelloways rock, <Sj-c. ; 11, demis- 

 sus,* coralline oolite, Kelloways rock, cornbrash, <$r. ; 12, cancel- 

 latus,* coralline oolite ; 13, 14, Oxford clay ; 15, Speeton clay. 



Ostracidse, Ostrea, 1, Marshii, Kelloways rock, cornbrash, and Bath oolite; 



2, gregarea, coralline oolite, calcareous grit, and Bath oolite ; 



3, solitaria, 4, duriuscula,* coralline oolite ; 5, insequalis,* Ox- 

 ford clay ; 6, undosa,* 1, archetypa,* Kelloways rock ; 8, sulci- 



fera,* Bath oolite ; 9, cornbrash ; 10, Oxford clay ; 11, Bath 

 oolite. 



Gryphaea, 1, incurva, 2, Maccullochii ? lias ; 3, dilatata, Kelloivuys 

 rock ; 4, bullata, 5, inhserens,* coralline oolite and calcareous grit ; 

 6, gigantea ? Bath oolite ; 'J, depressa,* marlstone ; 8, sinuata, 

 Speeton clay ; 9, naqa, coralline oolite, calcareous grit, Sfc. 



Division 3. Animal with ciliated tentacula at the mouth : shells (equilateral. 



Inaequivalviae. Terebratula, 1, intermedia, coralline and Bath oolite, fyc. ; 2, tri- 

 lineata, inferior oolite and marlstone ; 3, subundata, 4, semiglo- 



