94 ON THE CERITHI0P8IDES PROM THE ISTORTH ATLANTIC. 



(9) C. ATALAYA, Watsoii. (Hebrew HjSny, a Phoenician 

 word for a watch-tower.) 



Has a long, narrow, subcylindrical apex of four whorls, which are 

 parted by a broadish, very slightly impressed suture : the tip is 

 blunt, rounded, and smooth (or perhaps, when quite fresh, very 

 faintly fretted) ; the other three apical whorls are very finely 

 scored longitudinally by slightly fretted riblets which, near the 

 bottom of each whorl, are cut across by two small approximate 

 spiral threads. On the base just within the contraction is a single 

 circumbasal thread, between which and the pillar the base is very 

 slightly and flatly depressed, and is scored across by minute 

 radiating bars. 



Sah. Madeira, 0-50 fathoms (Watson). 



(10) C. METAXiE, auctorum (Ghiaje ? See Monterosato, No- 

 menclatura, p. 125.) 



Has inferiorly convex whorls and an impressed suture. It is 

 excessively long, with very straight profile-lines. The apex con- 

 sists of four nearly cylindrical and almost equal whorls, of which 

 the first is subtumid, with a slightly immersed tip ; it and the 

 following whorl are completely covered with minute microscopic 

 frettings or stipplings which, especially above the suture, are seen 

 to be arranged in spiral lines : the next two whorls are scored 

 with longitudinals, which above at the suture are straight and 

 distinct (though very fine) bars twenty-five to thirty in number, 

 but lower down become wavy and somewhat obsolete. The base a 

 little within the periphery is encircled by a strong untubercled 

 thread : the middle of the flattened base, which is slightly sunken, 

 is scored with very fine hair-like convex lines ; round the base of 

 the very short, broadly conical, and small-pointed pillar coils a 

 very obsolete thread, the scar of the old canal. 



Sah. From Shetland to the Canaries and the Mediterranean. 

 In this species it is not difiicult to separate two varieties, in 

 one of which the whole surface of the shell is comparatively 

 smooth ; in the other it is angular and bristles with points : it is 

 the latter which is the C. angustissima, Forbes ; the other is 

 C. rugulosa, Monterosato. The two forms, however, run into one 

 another ; and the very curious microscopic sculpture of the apex 

 is identical in the two. A really remarkable approach to the 

 latter form ( C rugulosa) is presented by the Sittium ahruptum, 

 Watson, from Fayal, Azores (see ' Challenger Prelim. Eeport,' 

 Linn. Soc, Journ., Zool, vol. xv. p. 119); but the apex is entirely 



