NAVICELLA. 79 1 



its var. fissa, Mousson, N. hupeana, Gassies and N. affinis, Mousson 

 are referred to it as synonyms. It occurs from New Caledonia to 

 Tahiti. 



Both N. borbonica and the form depressa have been referred to 

 N. porcellana, Linn., but that species, devoid of epidermis, must re- 

 ii in in unrecognizable. 



Morelet has figured (Jour, de Conch., Oct. 1887) a color variety 

 from the Comoros Is. It is large, and bimaculate with vermillion 

 inside in young as well as adult individuals. 



N. MACROCEPHALA, Guillou. PL 27, figs. 13-16. 



Convex, laterally compressed, beak much produced, large, worn 

 away below, epidermis dark chestnut color, with somewhat rugose 

 growth lines. L. 25-35 'mill. 



New Caledonia to Viti Is. 



N. sanguisuga, Reeve (figs. 13, 14), N. scarabceus, Reeve (figs. 15), 

 and its var. decapitata, Mousson, and N. magnified, Reeve (fig. 16), 

 with its var. truncata, Mousson, are synonyms. N. parva, Mousson 

 (PL 28, figs. 23, 24), from the Malay Archipelago appears to 

 have no distinctive character, except its much smaller size : I think 

 it is identical. 



N. SCULPTA, von Martens. PL 27, fig. 17, 18. 



Elliptical, lateral margins compressed, beaks large, dark chestnut 

 color, without markings, distinctly longitudinally, granularly lirate. 



L. 13 mill. 



Sumatra. 



N. LUZONICA, Souleyet. PL 27, fig. 19. 



Chestnut brown, rather smooth and somewhat shining, very mi- 

 nutely radiately reticulated, the markings barely visible except on 

 the beak ; convex, beak narrow, recurved, projecting beyond the 

 margin. L. 20-40 mill. 



Celebes, Philippines, Marquesas Is., etc. 



The insufficient distinction of this species rests on the fineness of 

 its reticulating dark lines. N. crepidaloides, Reeve (PL 28, fig. 20), 

 = var. compressa, Martens (PL 28, fig. 21) and var. adspersa, Mar- 

 tens (PL 28, fig. 22) are synonyms. 



N. BOURGAINVILLEJ, Recluz. PL 28, figs. 25, 26. 



Broadly elliptical, chestnut color or yellowish olivaceous, with a 

 large pattern of radiating, transverse, black reticulations. 



L. 20-30 mill. 



New Caledonia to Viti Is* 



