6i 



Genus Kntalina Monterosato 1872. 



1872. Entalina Monter. Notizie intorno alle Conchiglie Fossile di Monte Pellegrino et 



Ficarazzi p. 27. 

 1897. Entalina Monter., PiLSBRY & Sharp, Man. of Conch., vol. XVII, p. 131. 



Shell Dentalium-like, largest at the aperture, thence tapering to the ape.x; strongly ribbed, 

 and angular in section near the apex. Foot expanding distally into a disk with digitate periphery, 

 and having a median process or filament. Type E. qtiinquangularis Forbes. 



K e y t o s p e c i e s. 



I. Shell pentagonal at the apex, becoming anteriorly quadrate tubular. 

 a. The four angles persisting toward aperture. 



b. Longitudinally striate over the whole surface quadrangularis. 



b' . Longitudinal striae only near the four angles or sometimes only on 



the inner curve p la tamodes. 



a' . The four angles becoming obsolete toward aperture mirifica. 



II. Shell trigonal or faintly trigonal near apex. 



Inner curve delicately rounded cormicopiae. 



Inner curve with a longitudinal keel niediocarinata. 



I. Entalina platamodes Watson. PI. II, fig. 38. PI. VI, figs. 76 — 78. 



1879. Sipliodeutalutiii platamodes Watson, Journ. Linn. .Soc. London, XIV, p. 519. 

 1886. Siphodentaliiini platamodes Watson, Chall. Rep. Scaph., p. 13, pi. 2, fig. 4. 

 1889. DentaliuDi platamodes Watson. Dall, Ball. U. S. Mus., n" ij, p. 76. 

 1897. Entalina platamodes Watson. PiLSBRY & Sharp, Man. of Conch., vol. XVII, p. 133, 

 pl- 23, figs 3, 4, 5. 



Stat. 88. 0°34'.6N., 119° 8'.5 E. Celebes Sea. 1301 Metres. Fine grey mud. 6 Spec. 



Stat. 178. 2°4o' S., 128° 37'. 5 E. Ceram Sea. 835 Metres. Blue mud. i Spec. 



Stat. 211. 5°4o'.7 S., I20°45'.5E. Banda Sea. 1158 Metres. Coarse grey mud, superficial laycr 



more liquid and brovvn. 3 Spec. 



Stat. 221. 6°24'S., 124° 39' E. Banda Sea. 2798 Metres. Solid bluish grey mud with foramini- 



ferae, covered by a 5 cM. thick layer of brown mud, 

 uppermost layer of foraminiferae. 2 Spec. 



Stat. ? I spec. 



Diagnosis. Shell small, solid, finely tapered, curved, especially toward the apex, five- 

 sided, with four sharp corners, which are nearly right angles, and one very obtuse angle along 

 the concave curve; these all tencl to disappear toward the ape.x, the young shell being rounded. 

 Sculpture : the angles of the shell project more or less in a sharp rounded rib, which is sometimes 

 doublé; there are a few longitudinal striae, regular, 0,01 inch apart, strongest near the angles, 

 more or less obsolete as they recede from these. Neither end is fresh enough for description. 

 Length 0,47 inch, breadth 0,049 inch. (Watson). 



Distr ibut i o n. North of Culebra Island, West-Indies, 390 fms (Challenger) ; Florida 

 Strait 33V.. miles S. of Rebecca Shoal 430 fms. 



