strong rounded longitudinal ribs, becoming broader and flatter toward the anterior aperture and 

 separated by intervals as wide or nearly as wide as the ribs. Ribs as well as intervals micros- 

 copically reticulated by fine longitudinal and transverse raised lines, specially visible in young 

 shells and slightly roughening the shell's surface. Peristome a little dorso-ventrally compressed 

 rather thin-edged, undulated by the ribs; ribs interiorly hollow and strongest on the concave 

 margin. Colour very beautifully variegated with rose, olive-green and white. Length 60, dorso- 

 ventral diam. 11, transverse diam. 12, diani. of apex 3,5 — 4 mill. Perforation of apex beginning 

 as a wide notch and continuing as a slit, with a vai'iable length of i — 4 mill. 

 (From specimens in the Brit. Mus.). 



Distribution. Sooloo Archipelago, outside a coral reef near the city of Sooloo in 

 about 16 — 20 fms sandy mud. (Adams). 



3. Dcntalittui aprimini Linne. PI. I, fig. 3. PI. IV^, fig. 2. 



1766. Dentaliuni aprinuui Linne, Syst. Nat. (12), p. 1263. 



1788. Dentalium aprinum Linne. Gmel., Syst. Nat. (13), p. 3736. 



18 18. Dentalium aprinum Linne. LamarcK, An. s. Vert. V, p. 343. 



1825. Dentalium aprinum Linne. Deshayes, Mem. Soc. Hist. Nat. Paris, VII, p. 351, pi. 16, fig. 18. 



i860. Dentalium aprinum Linne. SOWERBY, Thes. Conch. Ill, p. 102, pi. 223, fig. 5, 6. 



1872. Dentalium aprinum Linne, Conch. Icon. XVIII, pi i, fig. 2a, b. 



? Dentalium aprinum Linne. Chenu, Illustr. Conch, p. 2, pi. i, fig. 11, 12. 

 1897. Dentalium aprinum Linne. Pilsbry & SHARP, Man. of Conch, vol. XVII, p. 3, pi. i, 



figs 8, 12, 14. 

 1839. Dentalium caprinum Anton, Verzeichniss d. Conchylien, p. 25 (1839). 

 1788. Dentalium striatulum Gmel., Syst. Nat. (13), p. 3738. 

 18 18. Dentalium striatulum Gmel. WoOD, Index test. p. 84, n'' 4. 



? Dentalium striatum (in part) Born, Test. Mus. Caes. Vindob. p. 431. 

 Not Dentalium aprinum Risso, Hist. Nat. Eur. Merid. IV, p. 399 (1826). 

 Not Dentalium aprinum Brocchi, Conch. Foss. Subappen. II, p. 264 (18 14). 

 Not Dentalium aprinum Costa, Fauna Reg. Nap., p. 34, 1850) or other authors on Italian mollusks. 



Stat. 33. Bay of Pidjot, Lombok. 22 Metres and less. Mud, coral and coralsand. i Spec. 

 Stat. 64. Djampeah. Up to 32 Metres. Coral, coralsand. i Spec. 



Stat. 71. Makassar and surroundings. 24 — 28 Metres. Mud, sand with mud, coral. 5 Spec. juv. 

 Stat. 313. East of Dangar Besar, Saleh-bay. Up to }yG Metres. Sand, coral and mud. i Spec. 



Diagnosis. Shell long, slender and well curved, the 

 diameter about one twelfth the length ; solid, giossy, pale green, 

 usually somewhat lighter toward the anal end. Sculpture, 9 — 12 

 conspicuous but narrow rounded longitudinal ribs, separated by 

 much wider, flat, polished intervals, often parted by a faint median 

 riblet, and usually showing numerous very slight longitudinal 

 striae; the ribs stronger on the concave side; growth striae 

 inconspicuous. Aperture circular; anal orifice very small and 

 circular, its edge crenated by the ribs; no slit. Length 70, 



greatest diameter 6 mill. Fig. 3. Antedov apertures of D. aprhmm. 



SIBOGA-EXPEDITIE LIV. 2 



