BY c. hedlp:y. 513 



Figs. 17, 18.— Operculum and raclula of Plesiotrochus monachus Crosse & 



Fischer. 

 Fig. 19. — Pyrene lurida Hedley. 

 Fig. 20. — Anahathron ascensum Hedley. 

 Fig. 21. — Anahathron contortum Hedley. 

 Fig. 22. —Amphithalamus capricorneus Hedley. 

 Fig. 23. — Onoba glomerosa Hedley. 

 Fig. 24. — Rissoa liddelliana Hedley 

 Fig.25. — Rissoiiwb kesteveni Hedley. 

 Fig. 26. — Turritella captiva Hedley. 



Plate xviii. 

 Figs. 27, 28. — Cithna marmorata Hedley. 

 Fig.29. — Alcyna australis Hedley. 

 Fig. 30. — Lippistes zodiacus Hedley. 

 Fig. 31. — Eidimella columna Hedley. 

 Fig. 32. — Odostomia canaria Hedley. 

 Fig. 33. — Odostomia sigma Hedley. 

 Fig.oi. — Odosto/nia bulhida Hedley. 

 Fig. 35. — Odostomia metata Hedley. 

 Fig. 36. — Stilifer auricula Hedley. 

 Fig. 37. — Stilifer orbicidatus Hedley. 

 Fig. 38. — Fossarus brumalis Hedley. 

 Fig. 39. — Cylichna doliaria Hedley. 



Plate xix. 

 Figs.40, 41, 42, 43. — Pyrene abyssicola Brazier, showing dimorphism, pro- 

 bably sexual. 

 Fig. 44. — Pyrene gemmulifera Hedley. 

 Figs. 45, 46. — Clancidus granti Hedley. 



Plate XX. 

 Figs. 47, 48, 49. — MoercMa introspecta Hedley. 



Figs. 50, 51, 52. — Gibbtda maccv.llochi Hedley; and enlarged sculpture. 

 Figs. 53, 54, 55. — Omalaxis radiata Hedley. 



Plate xxi. 

 Figs.56, 57, 58. — Astraliurii aureolum'H.edilej; with operculum. Nat. size. 



