452 THE VOYAGE OF H.M.S. CHALLENGER. 



Natica aurantia, var. straminea, Reeve, Conch. Icon., vol. ix. pL vi. fig. 20, pi. ix. fig. 32. 



„ „ Philippi, Conch. Cab. (ed. Kiister), p. 34, sp. 30, pi. iv. figs. 13, 14, and (Natica 



straminea) p. 113, sp. 130, pi. xvi. fig. 3. 

 „ Issel, Make Mar Rosso, p. 187, No. 461, p. 285, No. 179. 

 Mamma straminea, Brazier, "Chevert" Exped. Mar. Shells, Proc. Linn. Soc. New South Wales, 



voL i. 1877, p. 239, No. 64. 

 Natica aurantia, Sowerby, Thes. Conch., pts. 39, 40, p. 85, sp. 60, pL cccclv. (ii. Gen.), figs. 15, 16. 



Station 172. July 22, 1874. Lat. 20° 58' S., long. 175° 9' W. Off Nukalofa, Ton- 

 gatabu. 18 fathoms. Coral mud. 



Habitat. — Port Essington,. north coast of Australia (Reeve)-; North-east Australia 

 (Brazier) ; Red Sea (Issel). 



Fossil. — On shores of Red Sea (Issel). 



It is obvious that Philippi, though he separates Natica aurantia and Natica straminea, was 

 very strongly inclined to believe they are but one species, as Deshayes (Lamarck, Anim. s. vert., 

 vol. viii. p. 631, note) considers them. He expresses some doubt of this species being really distinct 

 from Natica mamilla, Linne. I have under that species noted some easily recognisable marks of 

 distinction. 



25. Natica (Mamma) draparnaudi, Recluz. 



Natica draparnaudi, Recluz, Journ. de conch., vol. ii. p. 198, pi. v. fig. 11. 



„ „ Reeve, Conch. Icon., vol. ix. pi. xi. fig. 44. 



„ „ Lischke, Jap. Meer. Conch., vol. ii. p. 74. 



„ „ Sowerby, Thes. Conch., pts. 39, 40, p. 77, sp. 12, pi. cccclx. (vii. Gen.) fig. 84. 



Uber draparnaudii, Dunker, Index MolL Mar. Japon., p. 62. 



Station 208. January 17, 1875. Lat. 11° 37' N., long. 123° 31' E. Philippines. 

 18 fathoms. Blue mud. 



Habitat. — Philippines (Reeve and British Museum). 



In this species the apex, when quite fresh, is probably black or very dark brown. It differs 

 from that of Natica mamilla, Linne (which is similar in colour), in being slightly larger, and the 

 increase of the whorls is also markedly more rapid Recluz, through some mistake, attributes this 

 species to the Gulf of Mexico. 



26. Natica (Mamma) mamilla (Linne). 



Nerita mamilla, Linne, Syst. Nat. (ed. 12), p. 1252, No. 719. 



Chemnitz, Conch. Cab., vol. v. p. 280, pi. clxxxix. figs. 1928, 1929. 



„ ,, Dillwyn, Cat., vol. ii. p. 984, sp. 17. 



,, „ Wood, Ind. Test., p. 178, pi. xxxv. fig. 19. 



Natica mamilla, Lamarck, Anim. s. vert., vol. vi. (2) p. 197, and (ed. Desh.) voL viii. p. 630, sp. 4. 



,, „ Deshayes, Encycl. method., vers, vol. iii. p. 599, pi. ccccliii. fig. 5. 



