PLANAXIS. 277 



Var. BREVICULUS, Desh. Fig. 24. 



Shell shorter, more ventricose, grooves and ribs less strong. 



Persian Gulf, Moluccas, New Guinea. 

 Nevill has described a var. tessellala. 



Var. SAVIGNYI, Desh. Figs. 25-27. 



Flat-ribbed, with narrower grooves, sometimes nearly obsolete, 

 greyish brown, tessellated and undulated with chestnut, often with a 

 lighter band at the periphery and another at the suture. 



Red Sea, Persian Gulf. 



P.grisea, Brocchi., P. encaustica, E. A. Smith (fig. 27), and var. 

 wbnigra, Nevill, are synonyms. 



P. CRASSISPIRA, E. A. Smith. PL 52, fig. 28. 



Distantly spirally grooved, grey, spotted and shortly strigate 

 with chocolate. Length, 20 mill. 



Hob. unknown. 



Probably a very narrow form of P. sulcatus. 



P. PLANICOSTATUS, Sowb. PI. 52, fig. 30. 



Dark chocolate color, with subequal alternate spiral ribs and 

 grooves, lighter colored within. Length, 1 in. 



San Bias, Panama, Galapagos Is- 



It is Bucc. planaxis, Wood, P. canaliculatus. Duval, P. circinata, 

 Lesson. 



P. SUTURALIS, Smith. PI. 52, fig. 33. 



Yellowish white, spirally deeply grooved, with intermediate flat 

 ribs. Length, 6 mill. 



Chinese Seas. 

 P. NUCLEUS, Lam. PI. 52, fig. 36. 



Chocolate color, epidermis shortly velvety, flat ribbed and spirally 

 grooved, but the sculpture obsolete except close to the aperture at 

 the suture and on the base, the outer lip being fimbriated by it, in- 

 terior chocolate. Length, 15-18 mill. 



West Indies. 



P. semi sulcatus, Sowb., is a synonym. 



P. ABBREVIATUS, Pease. PI. 52, fig. 40. 



Shorter than the next species, and without the expanded lip of 

 P. nucleus, blackish chocolate, Avith closely-engraved stride, obsolete 

 except at the base. Length, 7*5 mill. 



Tahiti. 



