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THE VOYAGE OF H.M.S. CHALLENGER. 



18. 

 19. 



20. 

 21. 

 22. 

 23. 

 24. 

 25. 

 2G. 



27. 

 28. 

 29. 

 30. 



31. 



Bissoa (Alvania) trajectiis, n. sp. 

 Bissoa (Alvania) lusdnice, n. sp. 



C. Spiralled strongly (Onoba), i.e., in which 

 the spiral threads are the striking feature. 



Bissoa (Onoba) fenestra! a, Krauss. 

 Bissoa (Onoba) armaria, Mighels. 

 Bissoa (Onoba) striata, (J. Ad). 

 Bissoa (Onoba) Waisoni, Schwartz. 

 Bissoa (Onoba) brachia, n. sp. 

 Bissoa (Onoba) acdonis, n. sp. 

 Bissoa (Onoba) mercurialis, n. sp. 



D. Spiralled weakly (Ceratia), i.e., in which 

 there are spiral threads, but these not strong. 



Bissoa (Ceraiia) glaphyra, n. sp. 

 Bissoa (Ceraiia) pachia, n. sp. 

 Bissoa (Ceraiia) transenna, n. sp. 

 Bissoa (Ceratia) rnacra, n. sp. 



E. Whorls flat and smooth (Cingula). 

 Bissoa (Cingula) giabraia, v. Muhlf. 



32. Bissoa (Cingula) rustica, n. sp. 



33. Bissoa (Cingula) seopulorum, n. sp. 



34. Bissoa (Cingula) alvearium, n. sp. 



F. Whorls rounded and smooth (Setia). 



35. Bissoa (Setia) albugo,- Wat.-. 



36. Bissoa (Setia) callosa, Manzoni. 



37. Bissoa (Setia) te?niisculpta, Wats. 



38. Bissoa (Setia) marionensis, n. sp. 



39. Bissoa (Setia) principis, n. sp. 



40. Bissoa (Setia) australis, n. sp. 



41. Bissoa (Setia) philomelce, n. sp. 



42. Bissoa (Setia) quisquiliarum, n. sp. 



43. Bissoa (Setia) edwardiensis, n. sp. 



44. Bissoa (Setia) sinapi, n. sp. 



45. Bissoa (Setia) triangularis, n. sp. 



G. Mouth separated from body- whorl 

 (Scrobs). 



46. Bissoa (Scrobs) scrobiculator, n. sp. 



47. Bissoa (Scrobs) badia, n. sp. 



A. Eibbed (Rissoa), i.e., of which the longitudinal ribs are the striking feature. 

 I. Rissoa costulata, Alder. 



Bissoa costulata, Alder, Ann. and Mag. Nat. Hist., 1844 (ser. 1), vol. xiii. p. 324, pi. viii. figs. 8, 9. 

 Forbes and Hanley, Brit. Moll., vol. iii. p. 103, pi. lxxvii. figs. 4, 5. 

 subcostulata, Schwartz v. Mohrenstern, Rissoa, p. 41, sp. 32, pi. iii. fig. 32. 

 costulata, Jeffreys, Brit. Conch., vol. iv. p. 35, vol. v. p. 208, pi. lxviii. fig. 1. 

 Weinkauff, Conch. Mittelmeer., vol. ii. p. 297, sp. 20. 

 Watson, Proc. Zool. Soc. Lond., 1873, p. 378, pi. xxxv. fig. 15. 

 „ Reeve, Conch. Icon., vol. xx. pi. iii. fig. 29. 

 ,, Monterosato, Enumerazione, p. 24. 

 „ Seguenza, Form. Terz. Calabria, pp. 268, 355. 



Weinkauff, Conch. Cab. (ed. Kiister), p. 139, sp. 37, pi. x. figs. 1-3. 

 Apicularia guerini, Monterosato, Nomenclatura, p. 56. 



February 10, 1873. Tenerife, Canaries. 70 fathoms. 



Habitat. — Great Britain to the Mediterranean (Jeffreys) ; Madeira (Watson). 



Fossil. — From the Middle Pliocene onwards (Seguenza). 



The Marquis de Monterosato holds this as Bissoa guerini, Recluz, which the Baron Schwartz von 

 Mohrenstern considers a distinct species. As I have remarked elsewhere and below in connection 

 with Rissoa parva, Scacchi, the whole group absolutely requires revision, and nothing but worse 

 confusion can result from mere partial meddling with it in the meantime. The Rissoa costulata of 

 Risso (1826) is a synonym of the earlier Rissoa variabilis, v. Muhlf. (1818), and is therefore out of 

 reckoning. 



