Vol. 62.] LIASSIC DENTALIID2E. 595 



Fie. 8. Dentalium subquadratum, sp. nov. (p. 588). Transverse section (poste- 

 rior end), X 4. 

 Heniera : [Twrneri about]. Locality: Honeybourne [clay-pit ?, 

 near Evesham]. Colin. : Slatter, British Museum, Nat. Hist. 

 [G. 10807]. 

 Figs. 9 a, 9 b, & 9 c. Dentalium parvulum (J. Buckman, MS.), sp. nov. (p. 585), 

 var. a. 

 a=Lateral view, x 2; b = Dorsal view, x 2 ; c= Transverse section, 



X4. 

 Hemera : rotiformis {teste S. S. Buckman). Locality: Clay-pit, 

 Bengewortb, Evesham. Colin. : L. Richardson. 

 Fi 0- . 10. Dentalium acutum, sp. nov. X 2 (p. 574). 



Hemera: striati. Locality: Railway-cutting, ' Dixton West,' 

 near Gotherington, near Cheltenham. Colin. : L. Richardson. 

 Figs. 11 a & b. Dentalium acutum, sp. nov., natural size. 

 11 c & d. Probably the same, X 2. 



Hemera: [striati ?]. 'Lower Lias.' Locality: 'Worcestershire.' 

 Colin. : H. E. Strickland, Sedgwick Museum, Cambridge. 

 12a & 126. Dentalium parvidum, sp. nov. (p. 585). 

 a=Specimen, X 2 ; 6=Transverse section, X 4. 



Hemera : Valdani. Locality : Leckhampton-Road Clay-pits, 

 Cheltenham. Colin.: Geological Society of London (type): 

 L. Richardson (figured specimen). 

 13 a, 13 5, & 13 c. Dentalium minimum, Strickland-Buckman (p. 582). 

 a = Specimen, X about 3 ; 6 = The same, X about 9 ; c=Transverse 



section, X about 9. 

 Hemera: [marmorea]. Locality: Island Magee. Colin.: Tate, 

 Museum of Practical Geology, Jeruiyn Street. 

 Fig. 14. Dentalium etalense, Terquem & Piette (p. 578). From a photograph 

 of the type-figure. 

 Hemera: [marmorets]. Locality : Saint-Menge. 

 Fics. 15 a & 15 6. Dentalium etalense, Terquem & Piette. 



a=Specimen, natural size; 5=Transverse section, natural size. 

 Hemera: [niarmorece]. Locality: Stout's Hill. Colin.: Moore, 

 Bath Museum. 

 16 a & 16 b. Dentalium giganteum, Phillips (p. 579). 



a= Specimen, natural size ; 6= Transverse section, natural size. 

 Hemera : [margaritati\. Locality : Hawsker Cliff. Colin. : 

 Tate, Museum of Practical Geology, Jermyn Street [8000]. 

 Fig. 17. Dentalium elongatum, Miinster (p. 575). X 2. 



Hemera : armati. Locality : Folly-Lane clay-pit, Cheltenham. 

 Colin. : L. Richardson. 

 18. Dentalium elongatum, Miinster, var. gracile, Moore. X 2. 



Hemera: armati. Locality: Hunting-Butts tunnel (G.W.R.), 

 Cheltenham. Colin. : L. Richardson. 

 Fi^s 19 a, 195, & 19c. Dentalium 'gracile,' Moore (var. of D. elongatum, 

 Miinster). (P. 576.) 

 a=Holotype, natural size; b = The same, X2J; c= Trans verse sec- 

 tion, X 2± 

 Hemera: [armati']. Locality: Camerton. Colin.: Moore, 

 Bath Museum. 



Discussion. 



Mr. R. S. Heeries expressed a hope that there would be some 

 information in the paper as to the method of occurrence of the 

 various forms of Dentalium. He called attention particularly to 

 the occurrence of D. giganteum in the Lias of Yorkshire. Enormous 

 numbers of this fossil occur in layers of sandstone about the 

 junction of the margaritatus and cajwicornus-zones. These layers 



