190 TRIFORIS. 



T. HILARIS, Hinds. PL 39, fig. 63. 



Whorls 14, tricarinate, the two lower carinse subequal, whitish, 

 the upper one a little larger, maculated with chestnut. 



Length, 10 mill. 



Pacific Ocean (Hinds). 



T. INCISUS, Pease. PI. 39, fig. 65. 



Whorls encircled by three prominent, smooth, regular ribs, 

 interstices deep, very finely longitudinally striated ; irregularly 

 spotted and marbled with various shades of yellowish white, brown 

 and purple. 



Sandwich Is., Isle of Bourbon. 



The last named locality is for T. triliratus, Desh., which Pease 

 considered a synonym. 

 T. DEXTROVERSUS, Ads. and Reeve. PL 39, fig. 58. 



Shell dextral, whorls 17-18, concave in the middle, spirally tri- 

 carinate, the middle carina much smaller, the interstices minutely 

 concentrically striated, yellowish white. Length, 12 mill. 



China Sea. 



Differs from all the other species in being dextral, and for that 

 reason I have already included it in Cerithiopsis ; as it has usually 

 been considered a Triforis, I repeat the description here. 



Unfigured and Doubtful Species. 



T. VARIEGATUS, A. Ad. ( T. Arthuri, Jouss.) St. John's, W. I. 

 T. INFREQUENS, T. BiMARGiNATUS, C. B. Ad. Panama. 



T. LACTEA, T. IANTHINA, T. MARGARITACEA, T. GRANULIFERA, T. 



VENUSTULA, T. DiSTiNGUENDA, of Dunker. Viti Is. 



T. HARPERI, Jouss. (T. alternata, Pease) Sandwich Is. 



T. BICOLOR, Pease. Sandwich Is. 



T. FASCIATUS, Tenison Woods. Tasmania. 



T. NIGROFUSCUS, and T. LABIATUS, A. Ad. Sydney, Australia. 

 T. CONSPERSUS, A. Ad. Japan. 



T. LUSORIUS, T. LINEOLATUS, T. MiNUTissiMus, Tapparone-Canefri. 



New Guinea. 

 T. INTERFILATUS (Hongkong), T. CALCULIFERUS (Loo Choo), T. 



CLATHRATUS, and T. INTERCALARIS ( China Seas), of Gould. 

 T. KAUAINUS, Jouss. (T. gracilis, Pease, preocc. by himself). 



Sandwich Is. 



