90 RISSOIDiE. 



2 Mauritius J coll. G. Nevill, Esq., and Surgeon-Major Power [8|, 



1 Eoweiah [Red Sea] ; coll. J. B. Baxter, Esq. [9^-. 5|] : operculum, 

 thin and horny-brown. 



This variety i^rincipally differs from Schwartz's figure in tlie 

 absence on the antepenultimate whorl of the longitudinal fur- 

 rows ; the characteristic denticulations within the outer lip are 

 well marked in the Mauritian specimens, they are unaccount- 

 ably wanting in Garrett's magnified figure, though " crenula- 

 tions within the peristome " are duly recorded in his description ! 

 The Red Sea form is considerably stouter and broader than 

 any of the other known ones, as can be seen from the above 

 recorded measurements. 



69. Rissoina japonica. 



Eissoina ]'aponica, TFeew^flM^, Conch.- Cab. II, 1881, pi. 15 A., fig. 1, Japan, 

 long. 3^, diam. 1\ mil. 



3 Japan [type] ; ex Mr. R. Damon. 



Long. 3, diam. \-^ mil. ; from the collection of the late A. 

 Adams, Esq., and labelled " B. jjulchella, A. Adams." 



70. Rissoina montrouzieri. 



Rissoina montrouzieri, Souverbie, J. de C, 1862, N. Caledonia, long. 15^ 

 diam. 4%, au/r. ll.; = B. supracostala, Garrett, F. Ac. Phil., 1872, 

 pi. 2, fig. 1, Viti, long. 10 mil.; ? = R. striolata, A. Adams, var. 



4 N. Caledonia; ex c. P. Bouvier, Esq. 



5 Andainans [15f, 5]; coll. J. Wood-Mason and G. Nevill, Esqrs. 



Very close to R. striolata, A. Ad., Philippines, apparently only 

 specifically separable by the constantly, markedly more developed 

 sculpture of the upper whorls. The longitudinal ribs are in 

 this form absent from the last four whorls, as in the type. 

 Several of the Andaman specimens show the characteristic and 

 peculiar dark "coating" so accurately described by Souverbie 

 as "un enduit noir epais, analogue a celui quirecouvre certaines 

 Melanies ; " this is especially the case with var. suhstriolata. 



subvar. monstrosa, nov. 



R. deforniis, Sow. Junr. in Reeve, fig. 63, not E, deformis, Soio. Senr. in 

 Genera of l^hells, and Schwartz. 



