PLATE A. 



[I have taken the figures iu this plate from specimens in my own Collection, except where otherwise stated.] 



Genus — Ludwioia, Bayle. 

 Pig. 1. — Suture-line of Lud. Murckisonce (Sow.), [from a specimen (obtained at Combe, near Sherborne, Dorset) in 

 the Collection of Mr. W. H. Hudleston, F.R.S., &c. (Pago 122.) 



Fig. 2. — Suture-line of Lud. Murchisonce, var. obtusa (Quenst.), from a specimen in my Collection obtained at Hasel- 

 bury, Somerset. (Pago 122.) 



Fig. 3. — Suture-line of Lud. Murehisonce (variety allied to, or adult of, Lud. obtusa), taken from a specimen in 

 Mr. Hiulleston's Collection labelled "Pea-grit, Cheltenham." (Page 122.) 



Fig. 4. — Suture-line of Lud. Murehisonce, var. Baylii, S. Buckm., from a specimen in Mr. Hudleston's Collection 

 obtained at Bradford Abbas, Dorset. (Page 122.) 



Fig. 5. — Suture-line of Lud. Lucyi, S. Buckm., var., from the specimen depicted Plate XXI, figs. 10, 11. (Page 122.) 

 Fig. 6. — Suture-line of Lud. cornu, S. Buckm. (Page 122.) 



Fig. 7. — Suture-line of Lud. rudis, S. Buckm., taken from the specimen figured Plate XV, fig. 13. (Page 122.) 

 Fig. 8. — Outline of the radial curve of Lud. MurchisoncB (Sow.), from the specimen figured Plate III, fig. 1. The 

 straight line in this and the other figures is drawn from the tip of the radius on the carina to the centre. -u = the middle 

 of the siphonal lobe; the dotted line marks the upper edge of the inner margin; the thick line the point of contact with 

 the next whorl. (Page 124.) 



Genus— (Ecotbat/stes, Waagen. 

 Fig. 9. — Suture-line of (Ec. conjungens, K. Mayer, from the specimen figured Plate XX, figs. 15, 16. The similarity 

 which this suture-line exhibits to those of Ludwigia and also to Pseudolioceras (fig. 22) is striking. Still this is not the 

 correct place for this genus. 



Genus — Lioceeas, Hyatt, emend. 

 Fig. 10. — Suture-line of Lioo. opalinum (Reinecke) from a young specimen. (Page 122.) 



Fig. 11. — Suture-lines of Lioc. ambiguum, var. costatum, S. Buckm., from the specimen figured Plate VII, fig. 7. 

 Part of the succeeding suture is here given in order to exhibit the length of the chamber. Although the difference in 

 this respect from that of Lioo. concavum (fig. 14) appears small, yet when the suture-lines are observed upon a specimen 

 in a long series the difference is marked, while it is heightened by the smaller auxiliary lobes. (Pages 29, 123.) 



Fig. 12. — Suture-line of Lioc. bradfordense, var. giganteum, S. Buckm., from the specimen figured Plate XI, fig. 1. 

 (Page 123.) 



Fig. 13. — Suture-line of Lioc. decipiens, var. simile, S. Buckm., from the specimen figured Plate XV, figs. 1, 2. (Page 123.) 

 Fig. 14. — Suture-line of Lioc. concavum (Sow.), from a typical specimen. (Page 123.) 

 Fig. 15. — Suture-line of Lioc. concavum, \a,r.formosum, S. Buckm. (Page 123.) 



Fig. 16. — Suture-line of Lioc. concavum, var. v-scriptum, S. Buckm., from the specimen depicted Plate X, figs. 5, 6. 

 (Pages 72, 123.) 



Fig. 17. — Suture-line of Lioc. apertum, S. Buckm., from the specimen figured Plate XV, figs. 3, 4. (Page 122.) 

 Fig. 18. — Outline of the radial curve of Lioc. concavum (Sow.), from the specimen which furnished the suture-line 

 depicted in fig. 14. v = middle of siphonal lobe; l' = middle of superior lateral lobe; I" = inferior lateral lobe. (Page 124.) 

 Fig. 19. — Outline of the radial curve of Lioc. concavum variety, from the specimen exhibited in Plate X, fig. 9. 

 (Page 124.) 



Fig. 20. — Outline of the radial curve of Lioc. concavum, 9. (Page 125.) 



Fig. 21. — Outlines of the radial curves of Lioc. concavum, var. v-scriptum. The outlines are taken from two different 

 places, the larger curves being about two thirds of a whorl beyond the other. (Page 125.) 



Genus — Pset/dolioceeas, S. Buckm. 

 Fig. 22. — Suture-line of Pseudolioceras Beyrichi (Schloenb.), var., from the specimen figured Plate XX, figs. 7, 8. 

 (Page 123.) 



Genus — Hypeelioceeas, S. Buckm. 

 Fig. 23. — Suture-line of Hyperlioc. discites (Waagen), var. e. (Page 123.) 



Fig. 24. — Suture-line of Hyperlioc. Walkeri, S. Buckm., from the specimen figured Plate XVI, fig. 1. (Page 123.) 

 Fig. 25. — Suture-line of Hyperlioc. discoideum (Quenstedt), from the specimen figured Plate XIX, figs. 1, 2. (Page 123.) 

 Fig. 26. — Suture-line of Hyperlioc. subdiscoideum, S. Buckm. (Pages 101, 123.) 



Fig. 27. — Section of the ventral area and carina of Hyperlioc. discoideum (in outline), showing the solid carina. 

 a=core; J = test; s = position of siphuncle. (Pages 81, 88.) 



Genus— Hiidoceeas, Hyatt. 

 Fig. 28. — Suture-line of Hild. bifrons (Brug.) (compressed, involute variety), from a specimen found in the Cotteswold 

 Sands of Coaley Wood. (Page 124.) 



Fig. 29. — Suture-line of Hild. bifrons (thick, evolute variety), from a specimen obtained in the Upper Lias Clay 

 (Commune-zone), Trent, near Yeovil, Somerset. (Page 124.) 



Fig. 30. — Outline of the radial curve of Hild. bifrons, from the same specimen. v = middle of siphonal lobe; I', of 

 superior lateral ; I", of inferior lateral ; « = edge of ventral and lateral areas; dotted line between V and ?" = sulcus in 

 lateral area; dotted line below = upper edge of inner margin. (Page 124.) 



Genus — Pcecilomoephus, 8. Buckm. 

 Fig. 31. — Suture-line of Pmcil. cycloides (d'Orb.), copied from his 'Ceph. jurass.,' pi. 121. Enlarged six times. 

 (Page 124.) 



Fig. 32. — Suture-line of Pmcil. cycloides (d'Orb.), from a specimen in my Collection. Enlarged six times. (Page 124.) 

 Fig. 33. — Suture-line of Poscil. macer, S. Buckm. Enlarged six times. (Page 124.) 



Genus— Haugia, S. Buckm. 

 Fig. 34. — Suture-line of Haugia variabilis (d'Orb.), copied from bis ' Ceph. jurass.,' pi. 113. 



Fig. 35. — Suture-line of Haugia variabilis, from a specimen in the Collection of the late Mr. E. Witchell, F.G.S. 

 Fig. 36. — Suture-line of Haugia Ogerieni (Duin.). Fig. 37. — Suture-line of Haugia Eseri (Oppel). 



Fig. 38. — Section of the ventral area and carina (iu outline) of Haugia variabilis, with the test present, showing 

 the structure of the hollow carina, a, a = core; 6 = test; c = hollow tube in carina; * = position of siphuncle; between 

 c and s lies the partition-band. This figure is enlarged twice. (Page 81.) 



Genus — Geammoceeas, Hyatt. 

 Fig. 39. — Suture-line of Oramm. fallaciosum, Bayle. Fig. 43. — Suture-line of Oramm. striatulum (Sow.). 



Fig. 40. — Suture-line of Oramm. sp. Fig. 44. — Ditto, from another specimen. 



Fig. 41. — Suture-line of Gramm. dispansum (Lycett). Fig. 45. — Outline of the radial curve of Oramm. striatulum. 

 Fig. 42. — Ditto, from another specimen. Fig. 46. — Suture-line of Gramm. Moorei (Lycett). 



Genus — Witchellia, S. Buckm. 

 Fig. 47. — Section of the ventral area and carina of Witchellia Iceviuscula (Sow.), a, a= core furrowed and slightly 

 carinated; 6 = test; c=- hollow tube in carina; d = partition band; s = position of siphuncle. The figure is enlarged twice 

 natural size. The test on the carina is perhaps somewhat too thick. The sulci on each side of s are not distinct enough. 

 (See pages 81, 82.) 



