GEOGRAPHIC DISTRIBUTION. XXV 



other species when these rich basins are more fully investigated. 

 See also p. 247. 

 a. No longitudinal sculpture. 



b. Kaised growth-striae near apex ; slender, length 22 mill., 

 11 times the diam., subtorquatum, p. 101. 



b'. Polished, much curved, extremely long and slender ; 

 length 90 mill., about 19 times the diam., 



longitrorsum, p. 111. 

 a'. Longitudinal striae near apex, elsewhere smooth, 



aciculum, p. 93. 

 a". Longitudinally ribbed. 



b. 9 strong ribs and some interstitial riblets ; length 40-48 



mill., about 7 times the diam., lineolatum, p. 11. 



b'. 11 indistinct ribs; shell thick, ungraceful; length 44 



mill., 8 times the diam., clavus, p. 55. 



6". 11-12 ribs, interstices and ribs strongly longitudinally 



lineated ; length 37 mill., 10 times the diam., 



aratorum, p. 10. 



V". 14 slightly elevated ribs, intervals flat ; length 31 mill., 

 20 times the diam., cookei, p. 29. 



b"". 21 subequal ribs, intervals flat; dense, lamellose growth 

 striae ; length 75 mill., 7 times the diam., 



shoplandi, p. 28. 

 A single Cadulus, C. minutus, p. 188, is described. 



Indo-Pacific Province : Torres Straits, Papua, JMeio 

 Caledonia, etc. 



Out of some sixteen species of Dentalium recorded from this area, 

 six are widely distributed Indo-Pacific forms. Of the others only 

 two have been figured, and comparisons with a good series of species 

 from other regions would probably develop some synonymy. Still, 

 it is evident that this region has a somewhat special Scaphopod 

 fauna. None of its species are known to extend southward to New 

 South Wales, though they probably follow the Great Barrier Reef 

 of Queensland. 

 a. Smooth, or with no longitudinal ribs or riblets. 



b. Incised spaced circular lines on smaller end, smooth to- 

 wards aperture ; length 14 mill., anulosum, p. 101. 

 b f . No conspicuous circular lines; glossy, strongly curved, 

 very long and slender ; length 90 mill., about 19 times 

 the diam., longitrorsum, p. 111. 



