420 



Borsonia Bellardi. 

 I. Borsonia Sniithi n. sp. PI. XXVII, fig. 5. 



Stat. 52. 9°3'.4S., 1 19° 56'. 7. E. Savu-sea. 959 M. Globigerine ooze, i Spec. 



Shell fusiform, rather thick, yellowish-white. Upper whorls lost by erosion, remaining 

 whorls 6, upper ones still eroded, of the 4 whorls which are in sufficient state of preservation, the 

 upper 2 are slightly angular, their upper part a little excavated, the lower part more convex, 

 with a single row of nodules on the limit ; in the lower ones the shell is slightly excavated 

 below the suture, but otherwise regularly rounded, without nodules; sculpture consisting of numerous 

 arcuate striae, with stronger ones at intervals, indicating the margin of the sinus at former 

 periods, and very faint traces of spiral striae in the excavation of the upper whorls, lower 

 part of each whorl sculptured with very fine growth-striae, likewise stronger at intervals and 

 rather weak spiral lirae, of which there are 2 below the angle of the upper sculptured whorl, 

 2 or 3 on the next, 5 on penultimate and numerous ones on body-whorl. This latter is regul- 

 arly attenuated towards the base and runs in the rather long, large canal, which in its basal part 

 is free from lirae and only sculptured by fine and groovelike growth-lines. Aperture angularly 

 ovate, with a moderately sharp angle above, ending below in a rather wide, shghtly contorted 

 canal. Peristome a little broken, probably rather thick, with a wide, rather shallow sinus above, 

 then regularly arched; columellar margin concave at upper part, along the body- whorl, then 

 thickened, with an obtuse, oblique fold at the upper part of this thicker one, directed to the 

 left below, along the canal. Interior of aperture smooth, white, the whole columellar side with 

 a strong layer of enamel. 



Alt. 18, lat. 7Y2; apert. alt. 9, lat. 2^5 Mill. 



This species is very remarkable, I know of but one Borsonia from the Indian sea, B. armata^ 

 described in 1895 t)y Boettger (Nachrichtsbl. Deutsche Mai. Gesellsch. Band 27, p. 11), which 

 is however in nearly every respect specifically distinct, the generic description of the columellar 

 fold agrees very well with the Siboga-shell : "Columella longa, recta et stricta, superne plica 

 transversa valida, hebeti instructa". Cossmann (Essai de Paleoconch. comp. Vol. II, p. 96) 

 gives as character of the genus: "columelle munie d'un ou de plusieurs plis", and gives (I.e. 

 p. 97) many instances of variability in the number and place of these folds. 



Ancistrosyrinx Dall. 



I. Ancistrosyrinx travancorica Smith var. granulata Smith. 



Smith. Ann. Mag. Nat. Hist. Sen 7, Vol. XIII, 1904, p. 459. 



Stat. 95. 5°43'.5 N., ii9°4o'E. Sulu-archipelago. 522 M. Stony bottom, i Spec. 

 Stat. 212. 5°54'.5S., I20°I9'.2E. 462 M. Fine grey and green mud. i Spec. 



The Siboga-specimens differ from the type described by Smith (Ann. Mag. Nat. Hist. 

 Ser. 6, Vol. XVIII, 1896, p. 368-) figured in the Illustrations, Zool. "Investigator", Moll. pi. 7, 

 fig. I, \a by their granular surface of the lower part of body-whorl; that from Stat. 95, 

 which is the best preserved, has the granules only towards the base of that whorl and on the 

 canal, that from Stat. 212 agrees more with Smith's description of the variety. 



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