166 LITTORINIDA. 
A form allied to, but distinct from, F. fenestratus, A. 
Adams. 
Sub-genus COUTHOUYIA, A. Adams. 
Ann. Mag., 1860, type C. decussata, A. Adams. 
A fossil species of Couthowyia is the Lacuna disjuncta, 
Rainc. and Munier, 1863. 
16. Fossar [Couthouyia] reticulatus. 
Fossar reticulatus, 4, Adams, P. Zool. 1853, p.186, Singapore, p. XX, fig. 
13; from Japan, op. cit. 1863 ; =F. insignis, G. § H. Nevill, J. As, Soc. 
Beng., 1871, Ceylon, long. 64, 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. 54, 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, 4. Adams, P. Zool. S. 1863, Yobuko [Japan], 25 fths. 
1 Japan; ex Mr. Damon (coll. A. Adams—Long, 24, diam, 14 mil.] 
1 Arakan; coll. Dr. Stoliczka. 
18. Fossar [Couthouyia] decussatus. 
Couthouyia decussata, 4. Adams, Ann, Mag. 1860, Mino-Sima. 
1 Japan ; ex Mr. Damon [coll. A. Adams]. 
Long 23, diam. 1 mil. 
