444 Messrs. J. Wood-Mason and A. Alcock on 



Family Trochidse. 



4. SoJariella metallica, sp. n. 



A brilliantly nacreous species, ornamented with two spiral 

 rows of conical tubercles and four smooth carinas on the base, 

 exclusive of a faintly granulated one which bounds the um- 

 bilicus. From 738 fathoms in the Gulf of Manaar (Station 

 109). The glistening- metallic lustre of the whole exterior is 

 largely though not entirely due to the erosion of the delicate 

 external layer of the shell. 



Fig. 12. 



h. 



Solariella metallica. — a, from the front ; b, from the base. Natural size. 



Family Strombidae. 



5. Rostellaria delicatula, Nevill. 



Rostellaria delicatida, Ne\'ill, Journ. As. Soc. Beng. vol. 1. (1881) pt. 2, 

 p. 262 ; Wood-Masou and Alcock, Ann. & Mag. Nat. Hist. (6) vii. 

 p. 16. 



Many specimens in various stages of growth from Station 

 119, 95 fathoms. 



This form, already noticed to be characteristic of the Bay 

 of Bengal infra-littoral at and near the 100-fathom contour 

 from Arrakan to the Godavari, is now found otf the Kistna 

 Delta, about seventy miles further south. 



Family PleurotomidaB. 



6. Pleurotoma symbiotes, sp. n. 



Two living specimens from the Laccadive Sea, 1043 

 fathoms (Station 108). 



They were encrusted all over with an Epizoanthus. 



The shell is remarkable for its peculiar glistening white 



