THE AXXALS 



AND 



MAGAZIXE OF NATURAL HISTORr. 



[seve:^th series.] 



No. 105. SEPTEMBER 1906. 



XX.Y.~Naf.Kral Historn Notes from III. M.S. 'Investigator.' 

 — Series III., No. 10. On Mollusca from the Ban of Bengal 

 and the Arabian Sea. By Edsar A. Smith, I.S.O. 



Tex communications to these ' Annals * upon the Mollusca 

 obtained by the ' luvestijrator ^ have already appeared — two 

 by the late Professor Wood-Mason and Professor Alcock 

 (1891, vol. vii. pp. 15-19, and vol. viii. pp. 413-118), and 

 eight by the present writer (1891, vol. xiv. pp. 157-174; 

 /. c. pp. 366-3G8 ; 1895, vol. xvi. pp. 1-19 ; /. c. pp. 262-265 ; 

 1896, vol. xviii. pp. 367-875 ; 1899, vol. iv. pp. 237-.251 ; 

 1904, vol. xiii. pp. 453-473 ; vol. xiv. pp. 1-14). The new 

 and more interestinoj species have been figured in the above 

 papers or in the " Illustrations of the Zoology or the Investi- 

 gator,^" edited by Prof. Alcock. The species still unfigured 

 and those described in the following pages will eventually be 

 illustrated in the latter work. 



Of the numerous species now described the most inter- 

 esting, perhaps, is the Morio Alcocki, which may be regarded 

 as an Indian-Ocean representative of the Mediterranean and 

 North-Atlantic M. rxtgosa. The occurrence of Oocorys 

 sulcata, another Atlantic form, off Ceylon, is also extremely 

 interesting. Other fine shells are Bathi/bembix Nevil/i, Gaza 

 Frederici, Dentalium cornu-bovis, and Nucula [Aci/a) granu- 

 lata. What is especially noticeable in all these collections 

 is the absence of many new generic types — indeed, up to the 

 Ann. & Mag. N. Hist. Ser. 7. Vol. xviii. 12 



