POTAMIDES. 165 



I think that C. Moreleti, Wattebl. (fig. 98), will prove to be a 

 minor form of this species, or perhaps with shell not fully developed; 

 a faint double carina encircles the base. It is from the last-named 

 locality. 



Unfigured Species. 



C. MINOR, Morch ( C. minuta, Dkr. MSS.). Cuba. 



C. PUPOIDEA, Morch. West Indies. 



C. PLICULOSA, Menke. West Indies. 



C. SIMILIS, C. RARICOSTATA, C. CRASSILABRUM, C. BALTEATA, C. 



ALBIVARICOSA, all of A. Adams. Philippines. 



C. ALTERNATA and C. TRiCARiNATA, Hutton. New Zealand. 



Subgenus PIRENELLA, Gray, 1847. 

 P. LAYARDI, A. Ad. PI. 34, figs. 86, 87, 84. 



Glaucous to chocolate color, usually light banded at the suture, 

 whorls with three series of nodules caused by decussating sculpture, 

 on the body- whorl the spiral sculpture becomes more prominent, the 

 ribs fading out. Length, 15 mill. 



Ceylon ; Cape York, N. Australia. 



C. Bombayana, Sowb. (fig. 84), appears to be a more than usually 

 smooth state of this species. 

 P. CONICA, Blainv. PI. 34, figs. 88-92, 85. 



Glaucous, chestnut or chocolate color, white banded at the suture, 

 and sometimes on the periphery, with three rows of beads on the 

 upper whorls and four rows on the body whorl, formed by decussat- 

 ing sculpture, base with a few spiral ridges. Length, 1 in. 



Mediterranean Sea, Red Sea. 



The principal synonyms are C. mamillata, Phil. (figs. 88-90), and 

 C. Sardoum, Cantraine (fig. 92). Monterosato has enumerated color- 

 varieties, albida, fastiata, atra and fusca. C. Cailliaudi, Pot. et 

 Mich., from the Red Sea, does not appear to differ, except in the 

 nodules being somewhat more prominent ; the same may be said of 

 C. cinerascente, Pallas (fig. 85), Isle of Karak, Persian Gulf. 



P. CLATHRATA, A. Ad. PI. 27, fig. 18. 



White, turreted, whorls 9, ventricose, spirally two-ribbed, crossed 

 by numerous longitudinal plaits forming beads at the intersections, 

 last whorl angular beneath, with a double rib at the angle. 



Length, 13 mill. 



Ins. Bohol, Philippines. 



