XXIV GEOGRAPHIC DISTRIBUTION. 



a". No longitudinal sculpture. 



b. Much curved throughout; amber, carnelian or white; 



smooth, glossy, length about 90 mill., about 19 times the 



diam., longitrorsum, p. 111. 



b'. Curvature moderate or slight ; surface with low variceal 



swelling or rings ; length 50-70 mill., 12 to 15 times the 



diam., eburneum, p. 115; philippinarum, p. 116. 



b". Curvature moderate ; surface smoothish ; apex notched 



on both convex and concave sides; length 33 mill., 11 



times the diam., bisinuatum, p. 108. 



b'". Nearly straight, small, fragile and acicular ; length 16, 



diam. of aperture 1 mill., subrectum, p. 119. 



Indo-Pacific Province Middle Indian Ocean, etc. 



D. quadrapicale, p. 34. Travancore, 406 fms. ; Malabar. 



D. usitatum, p. 29. Off Ceylon, etc., 597-675 fms. 



D. filosum, p. 13. Tenasserim. 



D. conspicuum, p. 248. Karachi. 



D. politum, p. 128. " Indian Ocean." 



D. profundorum, p. 79. Off Colombo, Ceylon, 675 fms. 



D. magnificum, p. 251. Offcast coast Ceylon, 637-800 fms. 



D. lacteum, p. 99. " India." 



D. insolitum, p. 109. Bay of Bengal, 597 fms. 



Entalina mirifica, p. 134. Off Ceylon, 200-350 fms. 



Cadulus anguidens, p. 253. Madras. 



Southwestern Indian Ocean. 



D. bisexangulatum, p. 15. Querimba Is. and Mozambique. 

 C. gadus, p. 186. 



C. divse, p. 188. Island of St. Paul. 



[D. segeum, p. 69. Kerguelen I., 110 fms.] 



South African. 



D. strigatum, p. 13. " D. lessoni Desh." Sowb. 



Indo-Pacific Province : Persian Gulf and Red Sea. 



Seven species of Dentalium are known from this province, only 

 two of which (longitrorsum and aciddumf) extend far beyond its 

 limits. As most of the others are still unfigured, it is possible that 

 some of them may prove identical with forms described from other 

 regions ; but on the other hand there will doubtless prove to be 



