465 



has the shape of a curved sword, with a rounded knob, and is finely serrated at one of its 

 margins, a little behind the top. The shape and disposition, as well of the gizzard-plates as of 

 the lateral teeth, four of which are in situ, displayed the appearance of the ribs of a quadruped, 

 as in Scaphander, and are in accordance with my locating the species amongst the Scaphandridae, 

 though, if this be right, the family-characters ought to be altered in accordance with the 

 slightly raised spire in the new genus. 



Scaphander Montfort. 



1. Scaphander Sibogae n. sp. PI. XXXI, fig. 10. 



Stat. 18. 7°28'.2S., II5°24'.6E. Bali-sea. 1018 M. Fine grey mud. 18 Spec. 



Stat. 45. 7°24'S., ii8°i5'.2E. Flores-sea. 794 M. Fine grey mud. 2 Spec. 



Stat. 208. 5°39'S., 122° 12' E. Between Buton and Kabaëna. 1886 M. Solid green mud. i Spec. 



Shell oval, rather thick for the genus, white, under a light-brown epidermis. Sculpture 

 consisting of more or less unequal growth-striae, having at intervals the appearance of folds, 

 and numerous spirals, which, on the ventral side, have often the appearance of rows of impressed 

 punctures; on the back and near the aperture, they are more like impressed spiral grooves, 

 with faint punctures; towards the base the grooves are deeper and partly distinctly punctured, 

 however this sculpture varies considerably in different specimens, the punctures being more 

 distinct in some specimens than in other ones. Spire concave, but the spiral perforation is 

 quite concealed by the enamel and bordered by a sharp keel. Body whorl moderately convex. 

 Aperture wide, especially below, where it is dilated; its upper margin forms a large, rounded 

 wing, much surpassing the spire, outer margin slightly convex, basal margin regularly rounded. 

 Columellar side of body-whorl not very convex above, strongly concave below, the body with 

 a strong layer of enamel. 



Alt. (from apex to base of ajaert.) 23, lat. 18, apert. alt. with wing 26, lat. above 6^3, 

 below 1 2 Mill. 



Alt. (from apex to base of apert.) 25, lat. 20, apert. alt. with wing 28, lat. above 7, 

 below 1473 Mill. 



This species has some resemblance with S. iinindus Wats., but the wing of the aperture 

 is much larger, the aperture is much broader in its lower half, the columella of the new species 

 being much more concave, the basal part of peristome is more regularly curved in S. inundtis, 

 dilated in 5. Sibogae, the sculpture is different, though variable, as stated above; the specimen 

 from Stat. 208 is very small (young) and strongly punctured. Perhaps it is different, but I 

 would not describe another new species on a rather similar specimen, the differences of which 

 may depend on age; the first recorded measurements are of a fine specimen with epidermis, 

 which has served for description, the other ones of the largest, somewhat bleached specimen. 



2. Scaphander attcnnaüts n. sp. PI. XXXI, fig. 11. 



Stat. 52. 9°3'.4S., ii9°56'.7E. Savu-sea. 959 M. Globigerina oozc. 5 Spec. 



Shell oval, upper part rather much attenuated, moderately strong, white under a yellowish 



13 



