MELVILL AND STKES : ANDAMAN IS. SHELLS. 167 



strongly spirally beaded whorls, liere and there stained with reddish- 

 fawn spots. It is placed, but very erroneously, by Tryon as a 

 synonym of M. luguhris, Swn. 



24. MiTEA (Cancilla) ceenifeea, Lam. A typical fonn of this 

 widely distributed species. 



25. MiTRA (Cancilla) eufilirata, Ad. & Reeve. 



26. MiTRA (Swainsonia) ocellata, Swn. This pretty species is 

 very nearly allied to M. Alarm, Ad., long known from the Andaman 

 Islands, though no specimen has as yet been sent by Mr. Booley. It 

 is, however, always distinguishable from the latter both in form and 

 the disposition of its markings. Our specimen is nearly tyjncal. We 

 consider it more than a mere variety of M. Jismrata, as suggested 

 by the late Mr. Tryon in his Man. Conch., ser. I, vol. iv, p. 131, 

 where, placing this and 31. fissurata rightly in Swainsonia, he relegates 

 the nearly allied M. incisa, Ad. «& Rve., and M. Marioi, A. Ad., to 

 the typical group Mitra, placing the latter as a mere synonpn 

 of the former. We cannot agree with him ; and when he adds that 

 both are probably the young of M. vanegata. Reeve, wo feel that any 

 attempts at argument would be useless, so diametrically opposed are 

 our views. 



27. Mitra (Costellarta) arenosa, Lam. In juvenile condition 

 only. AVe may mention that, having lately examined thousands of 

 specimens from the Loyalty Islands of the form known as M. exas- 

 perata, Chemn., we found it to vary in every degree, and to pass 

 from the distinct brown and white M. Hadfieldi, M. & IS., with its 

 transverse bands and paucity of ribs, into the typical and many- 

 ribbed 31. arenosa, Lam., so that no doubt was left on our minds but 

 that these forms are really all one and the same species. 



28. * Mitra (Callithea) AcnncTA, Reeve. A most beautiful 

 variety, which seems to connect the typical Philippine form of this 

 species with 31. Zehuensis, Reeve, also fi-om the Philippines, and 

 3f. prMexta, Shy., by some considered a variety of 31. Zebnensis. 

 The contrast in colour presented between the warm, brown painting 

 and the white body of the shell is extremely attractive and 

 characteristic. 



29. Mitra (Costellaria) lubens. Reeve. We have this also from 

 the Loyalty Isles, as well as the Philippines. Why Tryon considers 

 it a variety of 31. militaris, Reeve, and also introduces the distinct 

 3£. compta, A. Ad., as a synonym, it is impossible to say. 



30. Mitra (Pusia) aureolata, Swn. A fine-coloured specimen. 



31. Mitra (Pusia) croc.^ta, Lam. Quite typical. 



32. Mitra (Imbricaria) isomeres,^ n.sp. PI. XIII, Fig. 9, 

 I. testa cylinclracea, apud apicem obesa, crassiuscula, doliolifonni, 

 anfractibus 8, supernis, apicali incluso, arctis, compressis, subturritis, 



' icrufx(pr}s, ' liaviug- au et[ual share,' iu allusiou to its affinities. 



