DOLTUM. 263 



with bands of rather distant conspicuous white spots, shaded 



with brown. 



Philippines. 



My specimens indicate the pertinence of these forms to D. 

 olearium. Bulla canaliculata, Linn., is the young shell, as 

 determined by Hanley, from the type. 



Yiir. TESTARDT, Montr. PL 2, fig. 11. 



Ribs about twenty-three, with distinct narrow intermediate 

 grooves; pale fulvous, longitudinally clouded with darker color. 



New Caledonia. 

 D. ZONATUM, Green. PI. 3, fig. 17. 



Yellowish chestnut-color, ribs with an intermediate ridge, 

 which is divided into three ridges between the upper ribs. 



Length, 4-7 inches. 



China. Japan. 



Allied to D. galea, but differs in the intermediate ridges. D. 

 crenulatum, Phil., is a synonym. 



D. CROSSEANUM, Monterosato. PI. 2, fig. 12. 



Yellowish brown ; with thirty-six ribs, the interstices with 

 from one to three lirse ; lip brownish flesh-color. 



Length, 81 mill. 



Near Palermo, Sicily. 



I cannot count nearly thirty-six ribs on the figure of the 

 unique example of this species, and I am very much disposed 

 to believe it a synonym of the preceding, and that it has acci- 

 dentally become mixed with Mediterranean shells. 



D. FAsciATUM,Brug. PL 3, fig. 10. 



Interstices of the ribs without ridges; white, five-banded 

 with chestnut. Length, 4-5 inches. 



Philippines, China, Japan. 



D. sulcosum, Dillw., is a synon3 T m. 



D. COSTATUM, Menke. PL 4, figs. 19-22 ; PL 3, fig. 18. 



Ribs distant, prominent, nine to thirteen or fourteen in 

 number, the interstices broader, smooth, or faintly ridged in the 

 middle ; yellowish white, flesh-color or brownish. 



Length, 3*5-6 inches. . 



East Indies, Philippines, Mauritius. 



