MELVILL & SYKES : MAEINE SHELLS EKOM THE ANDAMANS. 37 



occurring in most collections from the East which we have examined 

 of late years. The Andaman Island form is large in proportion, and 

 well maiked with thick dots and dashes. 



15. Aqtjilltjs (Colubkama) obsctjetjs, Eeeve. Received as Anda- 

 manese, from Mr. J. E.. Henderson. 



16. AauiLLTTS EisrcATJSTictrs, Eeeve. 



17. Gyeineum (Apollon') bituberculare, Lam. Two specimens, 

 agreeing with individuals from the East Indies. 



18. Gyeinetjm (Bursa) elegans, Beck. Also reported from the 

 Mcobar Islands. 



19. Btjllia (Doesantjm) vittata, L. This species having its head- 

 quarters in Ceylon, the present record constitutes a north-eastward 

 extension of its range. 



20. Nassa ascularta, L. A well-grown form, but of smoother 

 surface dorsally than is usual. The callosity round the lip is likewise 

 not so pronounced. Another foiTu also occurs, dark cinereous, with 

 a single dorsal band. 



21. Nassa corojStata, L. Chiefly distinguished from the above 

 species {N. arcularia) by the complete smoothness and polished con- 

 dition of the upper whorls, and polished rounded nodules just below 

 the suture on the (often white-flecked) dorsal surface of the last 

 whorl. "We consider these characters constant, and that the species 

 is not conspecific with the nearly allied and commoner one, so often 

 associated with it. N. coronata has its headquarters, perhaps, in 

 Madagascar, but ranges far to the eastward, being reported from 

 all the East Indian Islands, including, of course, the Philippines. 

 We have also seen Andaman specimens collected by Mr. J. E. 

 Henderson. 



22. '^'Nassa (Aecularia) bimactjlosa, A. Ad. Very abundant, and 

 quite constant. We do not agree with Tryon ^ that this should be 

 merged in N. Thersites (Brug.), for, though gibbous, the smoothness, 

 comparatively speaking, of the dorsal surface, and especially the 

 twin spots just behind the outer lip, that suggested, no doubt, the 

 specific name, are quite characteristic. 



23. l^ASSA (Arculaeia) callosa, a. Ad. Not a very frequent form, 

 somewhat resembling the preceding species in miniature. N. callo- 

 s^nra^ A. AcL, is synonymous. 



24. Nassa (Aeculaeia) immersa, Carp. There seems to be some 

 confusion with respect to this species : Tryon unhesitatingly gives 

 it as a variety of JSf. bimaculosa, A. Ad., which, as just observed 

 above, he then merges in JY. Thersites^ Brug. The principal point 

 of resemblance appears to us to consist in the twin dark spots behind 

 the outer lip. These also occur in JSF. callosa. In Paetel's Catalogue, 

 California is given as a locality for this, but surely in error. 



1 Man. Concli., ser. i, vol. iv, p. 25. 



