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



12. Mitra (Costellaria) exasperata (Chemnitz). 



Voluta exasperata, Chemnitz, Conch. Cab., vol. x. p. 172, pL cli. figs. 1440, 1441. 

 „ „ Dillwyn, Catalogue, vol. i. p. 543, sp. 100. 



„ „ Wood, Ind. Test., p. 103, pi. xx. fig. 97. 



Mitra exasperata, Lamarck (ed. Desh.), voL x. p. 344, sp. 86. 

 ,, ,, Eeeve, Conch. Icon., vol. ii. pi. xxi. fig. 162. 



„ „ Kiister, Conch. Cab. (ed. Kiister), p. 45, sp. 12, pi. viii. figs. 13, 14. 



,, ,, Sowerby, Thes. Conch., vol. iv. pts. 31, 32, p. 28, sp. 384, pi. ccclxxL (xx. Gen.) 



figs. 419, 424, 425. 

 Turricula (Callithea) exasperata, v. Martens, Moll. Mauritius, &c, p. 255. 



„ {Costellaria) exasperata, Tryon, Manual, vol. iv. p. 180, pi. liii. figs. 541-544, pi. liv. 



figs. 545, 546. 

 E. A. Smith, " Alert " Collections, p. 498, No. 52. 



July 29, 1874. Levuka, Fiji. 12 fathoms. 



Habitat. — Eastern Africa, Indian Ocean, Ceylon, Nicobars, Malay Peninsula 

 (v. Martens). Seychelles, 4 to 12 fathoms (E. A. Smith). 



There is a tendency in many museums to mix up this species and Mitra arenosa, Lam. That the 

 species are different may be doubted, but the names at least should be kept distinct. Reeve, in 

 uniting Mitra arenosa to Mitra toridosa, Lam. (in part as given by Kiener), says — sancta quadam 

 simplicitate — " M. Kiener regards this species {Mitra arenosa) as a variety of the following " {Mitra 

 exasperata, of which, however, in fact, Kiener says not one word), " but I do not think it expedient to 

 follow his opinion. One half of the established species may be dispensed with were every one of 

 two that approximate abandoned upon the discovery of tbeir intermediate links." Could there be 

 a franker enunciation of the principle, Fiat species mat ccelum ? 



13. Mitra {Costellaria) fusiformis, Kiener. 



Mitra fusiformis, Kiener, Iconog., p. 99, pi. xxix. fig. 97. ' 



„ „ Reeve, Conch. Icon., voL ii. pi. xvii. fig. 132. 



„ „ Kiister, Conch. Cab. (ed. Kiister), p. 141, sp. 131, pi. xviie. fig. 7. 



Twricula {Costellaria) fusiformis, Tryon, Manual, vol. iv. p. 175, pi. Hi. figs. 484, 485, 487-489. 



July 29, 1874. Levuka, Fiji. 12 fathoms. 



Habitat. — Philippines (Ticao), and Zanzibar (Reeve). 



Sowerby (Thes. Concli., pts. 31, 32, p. 34, No. 460, fig. 384) says that his figure of Mitra fusiformis 

 " corresponds with the figure of Chemnitz, which Kiener's figure does not." He is probably right, as 

 Kiener does not seem to have been aware of Chemnitz's figure, which indeed I have sought in vain 

 in Schroter's Index to the first ten vols, of the Cabinet, and in the vols. xi. and xii. themselves. 

 Mr Tryon seems to have been more successful, but offers no help to other seekers. 



