ARCULARIA. 25 



N. circumcivcfa^ A. Ad. (do;. H), is rounded on si)f'C'imens 

 showino- the oraiioe-hordcivd callus. It was erroneously reported 

 from the Red Sea, but has been found at Alexandria, and on the 

 Syrian Coast. 



N. Kraussiana, Dunker. PI. T, figs. 18, 19. 



Yellowish brown, indistinctly dark banded ; callus yellowish 



or orange. Length, •4-5 inch. 



South. Africa. 

 , N. 01-hicidata, A. Ad. (fig. 19), is identical. 



N. Thersites, Brug. PI. 7, figs. 20-23. 



Ash, 3^ellowish or brown, sometimes mottled, with usually a 

 light central band. Ribs usually obsolete on the mouth side of 

 the dorsal hump. Length, 'G-So inch. 



Indian dce'in, Hong Kong, Manilla, Australia. 



N. bimaculosa^ A. Ad. (fig. 22), represents a stumpy specimen 

 of this species. It was described as from the Philippine Islands, 

 and Mr. E. A. Smith reports it from Andaman Islands, " sand- 

 banks, at low tide; very active animal." N. f/or.si/o.sa, A. Ad. 

 (fig. 23), from Philippines, is evidently a monstrosity; besides, 

 the shell looks as if it had been roasted : it is probably a 

 synonym. 



N. LEPTOSPIRA, A. Ad. PI. t, figs, 24-28. 



Yellowish ash-color, longitudinally rather closely plicated ; 

 callus yellowish, wide spread. Length, "75 inch. 



llo Ilo, Isle of Panay, Philippines (on mud banks, at low 



water, Cuminjf); Japan; Ascension Isl. (Pease', 



This may be considered on the one hand as a less-developed 

 form of N. TJiersifes., on the other as connected with N. foceolafa, 

 N. livescens, etc., in which the sculpture and general appearance 

 are siijiilar, but the callus is not spreading. I unite with it iV. 

 gracilis, Pease (fig. 25), N. bellula, A. Ad. (fig. 26), N. lahida, 

 Reeve (fig. 21), and N. Pe/-sica, Martens (fig. 28). ^V. Deshaije.^iana, 

 Issel, has been considered the equivalent of N. Fersica, von 

 Martens, by several excellent conchologists : A'ery probably it is 

 so, but it is tuberculate, shouldered, without spreading callus, 

 and typically is no closer to N. Per^ficn, than are most of the 

 nodulous species. 

 4 



