166 LITTORINID^. 



A form allied to, but distinct from, F. fenestratuSf A. 

 Adams. 



Snb-gemis COUTEOUYIA, K. Adams. 

 Ann. Mag., 1860, type C. decussata, A. Adams. 



A fossil species of Couthouyia is the Lacuna disjunda, 

 Rainc. and Munier, 1863. 



16. Fossar [Couthouyia] reticulatus. 



Fossar reticnlatns, A. Adams, P. Zool. 1853, p. 186, Singapore, p. XX, Jig. 

 13 ; from Japan, op. cit.1863 ; =F. insignis, G. ^ S. Nevill, J. As. Sac. 

 Jieng., 1871, Ceylon, long, 6k, diam. 5 mil. 



The two nuclear whorls are smooth, and the other four more 

 or less coarsely reticulate in this species. 



12 Hongkong; coll. R. Hungerford, Esq. [''at 10 fths."]. 



var. persoluta. 



1 Japan ; ex Mr. Damon [coll. A. Adams; labelled " C. reticulata"']. 



The last whorl is considerably less ventricose and more 

 "solute" than in the original figure of the Singapore type! 

 Long. 5j, diam. 3 mil. 



var. delicatula. 



2 Bombay ; coll. Rev. S. B. Fairbank. 



Rather smaller and of thinner texture; umbilicus a little 

 less defined ; apparently, one or two fewer of the spiral ribs. 



17. Fossar [Couthouyia] striatulus. 



Couthouyia striatula, A. Adams, F. Zool. S. 1863, Tolwlco {^Japan'], 25 fths. 



1 Japan ; ex Mr. Damon [coll. A. Adam3 — Long. 2|, diam. 1? mil.] 

 1 Arakan ; coll. Dr. Stoliczka. 



18. Fossar [Couthouyia] decussatus. 

 Couthouyia decussata, A. Adams, Ann. Mag. 1860, Mino-Sima. 



1 Japan; ex Mr. Damon [coll. A. Adams], 

 Long 2J, diam. 1 mil. 



