THE ANNALS 



AND 



MAGAZINE OF NATURAL HISTORY. 



[SIXTH SERIES.] 

 No. 81. SEPTEMBER 1894. 



XXIV. — Natural History Notes from 11. M. Indian Marine 

 Survey Steamer ^ Investigator^^ Commander C F. Oldham, 

 R.N. — Series 11. , No. 10. Report upon some MoUusca 

 dredged in the Bay of Bengal and the Arabian Sea. ^j 

 Edgar A. Smith. 



[Plates ni.-V.] 



Several reports by Dr. A. Alcock and the late Professor J. 

 Wood-Mason upon the Fishes, Crustacea, and other marine 

 Invertebrates obtained during the surveys of the ' Investi- 

 gator ' have ah-eady appeared in the ' Annals ' during the last 

 five years ; but only some brief observations have been uicule 

 upon the MoUusca. These were published in 1891 in vol. vii. 

 pp. 15-19, and vol. viii. pp. 443-448. 



Previously to these surveys there does not appear to have 

 been any dredging carried on in this part of the Indian Ocean 

 at any great depths, and therefore it is not surprising that 

 most of the species obtained at over a hundred fathoms are 

 new to science. Up to the present nothing generically new 

 has been discovered ; but of the species some are especially 

 interesting as bearing a close resemblance to others which 

 occur in remote parts of the world. For instance, i\\Q, Lucina 

 hengalensis^ dredged off the delta of the Godaveri in 410 

 fathoms, with the exception of a slight difference in form, is 

 very like L. lamellata from 245 fathoms in the Straits of 

 Magellan. Turbo {Cantrainea) indicus is possibly only a 

 variety of T. peloritanus, a deep-water form occurring in the 

 Mediterranean and Atlantic. The species of Amussium have 



Ann. & Mag. N. Hist. Ser. 6. Vol. xiv. 12 



