116 PROCEEDINGS OF THE MALA.COLOGICAL SOCIEXr. 



33. Vanikoro aperta (Carpenter). 

 Narica aperta^ Cpr. : Ann. Mag. Nat. Hist., 1864, vol. xiii, p. 477. 

 Hob. — Cape St. Lucas, Lower California. 

 Another very small form, only about 7 mm. in diameter. 



34. Vanikoeo insculpta (Carpenter). 

 Narica insculpta, Cpr. : Proc. Zool. Soc, 1865, p. 280. 



Sab. — Acapulco, West Mexico. 



A very small form, about 7 mm. in diameter, allied to V. aperta and 

 V. cnjptophila. None of these three species has yet been figured. 



35. Vanikoro lamellosa (D'Orbigny). B.M. 



Narica lamellosa. D'Orb. : Hist. Cuba, Moll., vol. ii, p. 41, pi. xvii, 



figs. 32-34.' 

 Vanikoro lamellosa: Tryon, p. 69 (as young of V. striata), fig. 81 (copy 



of D'Orbigny). 

 Hal. — Cuba, Martinique, and Guadeloupe. Type in B.M. 



Morch' considered this species the young of V. acuta, and Tryon 

 placed it as the probable early age of V. striata. Both conclusions 

 are quite incorrect, as a comparison of specimens of all three forms at 

 once clearly shows. Neither Morch nor Tryon could have had shells 

 for examination or they would not have made such mistakes. It may 

 be regarded as a rather aberrant form for the genus, 



36. Vanikoro oxychone, Morch. 

 Vanikoro oxyclioiie, Morch: Malak. Bliitt., 1877, vol. xxiv, p. 94. 

 Hah. — St. Thomas, West Indies. 



A small species, 4 mm. in height, differing from V. lamellosa in 

 having a distinct keel circumscribing the umbilicus. Of course it 

 has no relationship with V. striata, D'Orb., with Avhich it is united 

 by Tryon. 



37. Vanikoro Vincentiana (Angas). B.M. 



Adeorbis Vincentiana, An^o.?,: Proc. Zool. Soc, 1880, p. 417, pi. xl, 

 fig. 9; Tryon, Man. Conch., vol. x, p. 86, pi. xxx, fig. 100 (copy 

 of Angas). 



Sfab. — Aldinga Bay, St. Vincent's Gulf, South Australia. Type 

 in B.M. 



This shell seems to me more closely related to Vanikoro than to 

 Adeorbis. In form it approaches V. Cuvieriana, but it is more 

 depressed. It has the kind of sculpture met with in most species of 

 Vanikoro, that is to say, a different kind of ornamentation on the spire 

 than upon the body-whorl. The latter is very finely spirally striated, 

 and the antepenultimate whorl is distinctly (under the lens) plicate. 

 This is not referred to by Angas, probably having been overlooked, as 

 the type, presented by him to the British Museum, is not in very fresh 

 condition. 



1 Malak. Blatt., 1877, vol. xxiv, p. 94. 



