166 LITTOEINIDJl. 



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

 Adams. 



Sub-genus COUTHOUYIA, A. Adams. 

 Ann. Mag., I860, type C. decussata, A. Adams. 



A fossil species of Couthouyia is the Lacuna disjunda, 

 Rainc. and Munier, 1863. 



16. Possar [Couthouyia] reticulatus. 



Fossar reticulatus, A, Adams, P. Zool. 1853, p. 186, Singapore, p. XX, fig. 

 13; from Japan, op. cit.1863; =F. insignis, G. $ H. Nevill, J. As. Soc. 

 Seng., 1871, Ceylon, long. 6\, diam. 5 mil. 



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

 or less coarsely reticulate in this species. 



12 Hongkong; coll. E. 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. 



Bather smaller and of thinner texture ; umbilicus a little 

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



17. Possar [Couthouyia] striatulus. 



Couthouyia striatula, A. Adams, P. Zool. S. 1863, ToluJco [Japan], 25 fths. 



1 Japan ; ex Mr. Damon [coll. A. AdarnS Long. 2|, diam. 1$ mil.] 

 1 Arakan ; coll. Dr. Stoliczka. 



18. Possar [Couthouyia] decussatus. 

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



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

 Long 2J, diam. 1 mil. 



