1<)0 POTAMIDES. 



India, Singapore, Borneo, China, Japan, Philippines, Australia. 

 The type was a younger shell in which the aperture had not 

 yet expanded ; Kiener described the adult as P. micropterus (fig. 

 39). Other synonyms are P. alatus, Phil. (fig. 49), P. radix, Dufo, 

 P. incisus, Hombr. et Jacq. (fig. 51), and var. minor, Tapparone 

 Canefri, P. retifera, A. Ad. (fig. 40), P. euryptera, A. Ad. (fig. 52), a 

 pupoidal-shaped variation, from the Philippines. 



P. PALUSTRIS, Linn. PI. 32, figs. 41, 42. 



Whorls flat, with deep suture, divided by three spiral incised 

 lines, upper whorls longitudinally plicate, gradually becoming indis- 

 tinct below ; epidermis and interior dark chocolate, the latter some- 

 times banded. Length, 4-5 in. 



India, Java, Australia. 



The synonyms are P. agnatus, Gmel., and P. crassus, Lam. 



P. CALEDONICUS, Jousseaume. PL 32, figs. 43, 44. 



Like P. palustris in sculpture, but the longitudinal ribs much 

 more distinct, form narrower, more cylindrical; yellowish white, 

 more or less banded and blotched with chocolate. Length, 2*5 in. 



New Caledonia. 



Subgenus TEREBRALIA, Swains., 1840. 



P. SEMITRISULCATUS (Bolten), Morch. PL 32, fig. 45. 



Upper whorls flat, plaited, all of them with incised revolving lines 

 of which there are about five on the penultimate whorl ; glaucous, 

 more or less broadly banded and variegated with chocolate. 



Length, 2'5-3 in. 



Australia, Java. 



P. SULCATUS, Born. PL 32, figs. 46, 47. 



Whorls longitudinally strongly ribbed, tuberculated by the cross- 

 ing of incised spiral sulcations , chocolate brown or glaucous, 

 banded with chocolate, aperture often banded. Length, l'5-2'25 in. 



Singapore, China, Philippines. 



The synonyms are P. Molluceanus, and P. fuscus, Gmel., and P. 

 Mangiorum, Schroeter. 



P. GOURMYI, Crosse. PL 32, fig. 48. 



Smooth, finely, closely, spirally striated; epidermis yellowish 

 brown, reticulately longitudinally strigate, or interruptedly blotched 

 with chestnut, interior white. Length, 2'5 in. 



N. Caledonia ; Bampton Reef, So. Pacific 0. 



