172 



PROF. E. VON MARTENS ON THE SHELLS 



Mergui this species lives associated with Nerita lineata and 

 Columbella Duclosiana. Bengal, Tranquebar, Mergui, Singapore, 

 Bangkok, Java, Borneo, Celebes, Philippines, Japan. 



57. Neritina (Dostia) G-uerinii, Becluz, Bevue Zool. 1841, 

 1). 314 ; Soioerby, Thesaur. Conch, ii. pi. 111. fig. 272. 



A pretty little shell, shining blackish with white spots. 

 Mergui, mud-flats, associated with Assiminea brevicula ; King 

 Island. Sumatra. 



58. Neritina (Clithon) Sowerbyana, Becluz, Broc. Zool. Soc. 

 1842, p. 174; Sowerby, Thes. Conch, ii. pi. 109. figs. 5-8; 

 Beeve, Conch. Icon. ix. pi. xx. fig. 89, a-d; v. Martens, Monogr. 

 Neritina, p. 172, pi. 18. figs. 1-4. 



King Island, littoral ; and Elphinstone Island Bay. 



This species was hitherto not known so far westward, its 

 geographical distribution ranging from Southern Japan and 

 China to the Gulf of Siam and the Philippines. At Hongkong 

 I have found, it also in sea-water, in company with Littorina. 



59. Neritina (Clithon) Ualanensis, Lesson, Voy. de la 

 'Coquille," Zool. p. 379 ; Beeve, I. c. ix. pi. xxxvi. fig. 168 ; v. Mar- 

 tens, Monogr. Neritina, p. 193, pi. 20. figs. 1-24. 



Neritina Mertoniana, Becluz, Proc. Zool Soc. 1843, p. 71 ; Sowerby, 

 Thes. ii. figs. 242-246. 



A handsome little species, resembling somewhat JV". virginea, L., 

 from the West Indies, but essentially distinct in the operculum ; 

 extremely variable in colours, usually ornamented with very fine 

 dark lines on a shining greenish ground. 



Elphinstone Island, immediately below high-water mark, on 

 sand ; King Island ; Sullivan Island, highest water-mark. 



"Widely distributed, extending from Madras and Ceylo7i to 

 Southern Japan, the Carolines, Viti Islands, and Northern 

 Australia. Commonly found in brackish water. 



c. BIVALVIA. 



OSTBEIDJ9. 



60. OsTBEA cucullata, Born, Testacea Musei Cces. Vindob. 

 1780, pL 6. figs. 11, 12 ; Beeve, Conch. Icon, xviii. pi. xvi. fig. 34. 



Shape of the shell very variable, often wrinkled and angular ; 

 •ize ordinarily rather small ; substance solid, white ; edges blackish 



