Though this species as stated above, is easily recognizable by its shorter, stouter shape, 

 its mainly stronger sculpture and especially by the two dark spots on the much thickened 

 peristome, its specific rank is at least very questionable. 



6. Nassa (Arcularia) immersa Carpenter. 



Stat. 260. Near North point of Nuhu Jaan, Kei-islands. 90 M. Sand, coral and shells. 1 Spec. 



Tryon says of this species in his index of Vol. IV (Man. of Conch.), that it is a 

 synonym of N. bimaculosa. Marrat (On the varieties of the shells belonging to the genus 

 Nassa, p. 74 N° 1249) considers it to be a variety of bimaculosa. I think the species is sufficiently 

 characterized by its enormously developed callosity, partly covering the spire, to be provisionally 

 considered as a good species. The Siboga-specimen is bleached and slightly worn, but I have 

 a fresh specimen, formerly identified by Mr. E. A. Smith, from South-Sumatra (Lampongs), 

 which agrees in every essential respect. I failed to find the original description. 



7. Nassa (Arcularia) leptospira A. Adams. 



A. Adams. Proc. Zool. Soc. Lond. 1851, p. 103. 



REEVE. Conch. Ie. Vol. VIII, Nassa, fig. 84. 



Tryon. Man. of Conch. Vol. IV, p. 25, PI. 7, fig. 24. 



Stat. 86. Dongala, Palos-bay, Celebes. Reef. 1 Spec. 



The specimen is of a rather stout shape, showing affinity to the next species. 



8. Nassa (Arcularia) globosa Ouoy & Gaimard. 



Ouov & Gaimard. Voy. Astrolabe, Vol. II, p. 448, PI. 32, fig. 25 — 27. 

 KlENER. Coq. Viv. Vol. VIII, Buccinum, p. 101, PI. 27, fig. 108 [clathratum). 

 REEVE. Conch. Ie. Vol. VIII, Nassa, fig. 62. 

 TRYON. Man. of Conch. Vol. IV, p. 26, PI. 8, fig. 37, 38. 



Stat. 86. Dongala, Palos-bay, Celebes. 36 M. Fine grey mud (river mud). 1 Spec. 

 Stat. 174. Waru-bay, North coast of Ceram. 18 M. Mud. 2 Spec. 

 Stat. 323. Sangkapura-roads, Bawean-island. 12 M. Mud. 8 Spec. 



9. Nassa (Alectryou ) elegans Kiener. 



KlENER. Coq. Viv. Vol. VIII, Buccinum, p. 56, PI. 24, fig. 97. 

 Tryon. Man. of Conch. Vol. IV, p. 27, PI. 8, fig. 47 (glans var.). 



Stat. 11. Bay of Pidjot, Lombok. 22 M. and less. Mud, coral and coralsand. 5 Spec. 



Stat. 47. Bay of Bima, near South fort. Shore. 3 Spec. 



Stat. 71. Makassar and surroundings. Up to 32 M. Mud, sand with mud, coral. 7 Spec. 



Stat. 169. Atjatuning, West coast of New Guinea. 57 M. Mud. 1 Spec. 



Stat. 204. Betvveen islands of Wowoni and Buton, Northern entrance of Buton-strait. 75 — 94 M. 



Sand with dead shells. 1 Spec. 



Stat. 313. East of Dangar Besar, Saleh-bay. Up to 36 M. Sand, coral and mud. 8 Spec. 



I think this species differs sufficiently from N. glans to be kept separate. Tryon unites 

 it with N. glans as a variety, but his description, mentioning "the revolving brown lines" of 



67 



