400 RET. E. BOOa WATSON ON THE 



regular scratch-like lines ; on the ribbed area these are stronger. 

 On the base the interstices become somewhat narrower and more 

 convex, till on the snout they rise into strongish threads, which 

 at the very point again become weaker. Colour a light tawny, 

 paler on the snout, and white on the pillar. Spire high, conical, 

 and slopingly subscalar. Apex broken. Whorls probably 10, 

 rather short, with a straight somewhat drooping shoulder, convex, 

 and appearing contracted below in consequence of the dying 

 out of the longitudinal ribs as they approach the suture. The 

 conical base contracts rather rapidly, and is prolonged into the 

 straight, very slightly reverted, direct, narrow, cylindrical snout. 

 Suture a fine, regular, squarely impressed line, whose course 

 diverges a good deal from that of the spirals of sculpture. 

 Moutli club-shaped, being roundly oval and not angulated above, 

 and with a long, narrow, slightly twisted canal below. Outer 

 lip sharp and thin, with a very regular curve from the suture 

 to the base of the snout, along the edge of which it runs sharp 

 and straight to the open, rounded, and thin point ; when it leaves 

 the body, it retires at once to the left, forming a deep, rounded, 

 open sinus ; from this point its edge sweeps out in a full convex 

 curve, retreating slightly at the base of the snout, and then 

 advancing straight to the point. Inner lip porcellanous, longi- 

 tudinally marked, narrow, straight, cut away obliquely to a long 

 fine point ; and then continued along the canal in a thin sharp 

 edge, which toward the point is slightly cut off" backwards. H. 0*9. 

 B. 0*32. Penultimate whorl, height 013. Mouth, total height 

 0-15, breadth 019. 



The narrow sharpish ribs of this species are suggestive of small 

 buttresses, from which feature the name is taken. The specimen 

 is slightly chipped, and is, I think, not quite full-grown. It a 

 little resembles the young of P. tenuis, Eeeve, from China ; but the 

 longitudinal ribs are not nodulous. In form it slightly recalls 

 P. undatiruga, Bivona, but in texture and all details is utterly 

 different. 



10. Pleurotoma (Sttrcula) rhysa, n. sp. 



St. 122. September 10, 1873. Lat. 9° 5' S., long. 34° 5(X W. 

 Pernambuco. 350 fms. Mud. 



SJtell. — High, narrow, conical, with a small apex, a contracted, 

 conical base, and a longish narrow snout ; carinated, ribbed, with 

 spiral threads, pale buff. Sculpture. The whole surface is frosted 



