63 



Remarks. This shell is nearly related to Entalina plataniodes Watson and Entalina 

 mirifica Smith. It is distinguished from the former by a greater rate of increase and a coarser 

 and more generally distributed sculpture ; of the latter by the distinctly quadrangular form of 

 the anterior aperture. 



It is also nearly related to Dentalmm tetragommi Brocchi ") a fossil shell from the North 

 Italian Tertiary and to Dentalmm quadratuin K. Martin ') of the Java Tertiary. To judge after the 

 figures, they seem to represent intermediate forms h&twe&n plataniodes, mirifica and quadrangtilaris . 



4. Entalina mediocarinata n. sp. PI. VI, figs 70, 71, 72, 87 88. 



Stat. 5. 7°46'S., U4°3o'.5 E. Bali Sea. 330 Metres. Mud. 2 Spec. 



Stat. 256. 5°26'.6S., 132° 32'. 5 E. Off Kei-islands. 387 Metres. Greyish green mud. i Spec. 



Diagnosis. Shell moderately curved, compressed between inner and outer curve, near 

 the apex trigonal in section ; the excurved side flat, the incurved side laterally 

 compressed forming a strong prominent keel, sharp near the apex, obtuse 

 toward the anterior aperture. Sculpture of 40 — 50 weak rather equal riblets, 

 separated by shallow interstices; near the apex the riblets are alternately small 

 and large, or if not so only half the number is developed. On the excurved 



* ' •' i Fig. 29. 



side runs a slightly concave band, sculptured with finer riblets than in the Ant. apert. of Entalina 



neighbounng parts, on the mcurved side, 2 or 3 ribs running along the keel s 



edge are stronger than the rest. In the largest specimen the ribs are broader and less raised 



than in the smaller ones. Obliquely encircling growth striae, exceedingly fine and regular making 



numerous slight impressions on the riblets. Apex with a short angular notch on the excurved 



side. Anterior aperture very oblique and jagged from fracture, compressed in antero-posterior 



direction. Colour milky white, a little transparent in live specimen. 



a. Length 25 mill., antero-posterior diam. of apert. 3 mill., lateral diam. of apert. 3,3 mill. 



d. Length 19,5 mill., antero-posterior diam. of apert. 2,3 mill., lateral diam. of apert. 2,5 mill. 



c. Length 13 mill., antero-posterior diam. of apert. 2,3 mill., lateral diam. of apert. 2,3 mill. 



5. Entalina cornucopiae n. sp. PI. VI, fig. 89. 



Stat. 52. 9°3'.4S., II9°56.7E. Sumba Sea. 959 Metres. Globigerina ooze, i Spec. 



Diagnosis. Shell white, moderately curved, the excurved side flat, a little concave near 

 the top, the incurved side slightly laterally compressed, faintly suggesting the 

 existence of a very obtuse longitudinal keel anteriorly delicately rounded. 

 Sculpture of about 30 well-raised riblets, separated by equally wide or wider 

 interstices. Growth striae very oblique, not conspicuous. Ape.x with a shallow 

 notch on both the incurved and the e.xcurved side. Anterior aperture very 



Fig. 30. Ant. apert. of 



oblique, the margin on the excurved side flat. Entalina cornucopiae- 



Length 15,5 mill., diam. of apert. 3,2 mill. 



i) Dcntalinm tctragonum Brocchi, Conch, foss. subapp. II, p. 627, Tav. XII, fig. 26 (1814). 



2) Dcntalinm quadratum K. Martin Samml. des Geol. Reichsmus. in Leiden, i« Serie, Bd. Ill, (Tiefb. auf Java) p. 190, 

 T.ib. X, fig. 191 (1881 — 1887). 



