MOLLUSCA OF THE ' CHALLENGER ' EXPEDITION. 607 



ScALABiiDiE, Kef er stein. 

 ScALARiA, Lam 



1. S. tortilis, n. sp. I 3. S. acus, n. sp. 



2. S. dentiscalpium, n. sp. | 4. S.funiculata, n. sp. 



Orossea, J. Ad. 

 C. striata, n. sp. 



1. SCALAEIA TORTILIS, n. Sp. 



St. 24. March 25, 1873. Lat. 18° 38' 30" N., long. 65° 5' 30"W. 

 N. of Culebra Island, St. Thomas, Danish W. Indies. 390 fms. 

 Coral-mud. 



Shell. — Yery long, with numerous small rounded whorls, 

 broadish, rounded distant ribs, and close spiral threads, impressed 

 suture, and a broad, square, smooth base defined by a strong spiral 

 thread. Sculpture. Longitudinals — There are on each whorl 14 

 rather remote rounded ribs ; they slightly diminish in number and 

 remoteness up the spire ; they cross the whorls with a very slight 

 trend but straight course toward the right ; they do not extend to 

 the base, which is quite plain but for slight hair-like lines of growth. 

 Spirals — there are about 9 or 10 close-set very little raised threads 

 on each whorl ; that defining the base is strong, and can be traced 

 just above the suture up the spire. Colour white. Spire high 

 and narrow, conical. Apecc broken. WJwrls — 10 at least remain 

 below the embryonic shell ; they are well rounded, and of very 

 slow increase bothi in height and in breadth. Suture deeply 

 impressed by the contraction of the whorls above and below. 

 Mouth broken, but apparently very round and oblique, a little 

 angulated at the basal keel. Inner Up slight, very thin on the 

 body, slightly reverted on the pillar. H. 0-42. B. O'l. Pen- 

 ultimate whorl, height 0-06. Mouth, height 0-07, breadth 0-07. 



This species has some resemblance to S. varicosa, Gr. 0. Sars 

 (S. "Wood?), but is much narrower, with smaller and more 

 numerous whorls ; and the base is much squarer, and is not 

 contracted. It extremely resembles Cerithium costulatum, Moll., 

 but is a larger shell, and under a superficial resemblance the 

 whole sculpture, both longitudinal and spiral, is quite different. 



2. SCALABIA DENTISCALPIUM, U. Sp. 



St. 187. Sept. 9, 1874. Lat. 10° 36' S., long. 141° 55' E. Near 

 Cape York, Torres Straits, N. Australia. fms. Coral-sand. 



Shell. — Small, extremely long and sharj), most delicately closely 

 and sharply ribbed and spiralled, with rounded whorls and base 

 and an impressed suture. Sculpture. Longitudinals — the whorls 

 are crossed by an immense number of minute, sharp, very oblique 



