108 REV. R. BOOG WATSON ON THE 



broad aud flat ; the second small and indefinite ; the third at the 

 periphery, where, transversely long, the tubercles are sharp and 

 small ; the fourth row is within the base, and there they are very 

 small. The pillar is feebly scored with many remote very small 

 threads. The surface is otherwise smooth and rather glossy. Colour 

 dead white, with minute longitudinal lines and spots of faint ruddy 

 brown, with suffused stains of fainter brown ; on the penultimate 

 whorl there are five, on the last ten very fine spiral lines of the 

 same colour. Spire sharply but slightly convexly and a very little 

 gibbously conical. Apex sharp. Whorls about 14, of regular in- 

 crease, flat ; the last is contracted and drawn out and slightly bent 

 from the axis of the shell, while the base is a little pinched in. 

 Suture very faint. Mouth oval, but pointed at the canal and at the 

 upper corner, where it is narrowed by a slight contraction of the 

 lip and by the basal tooth ; porcellanous and glossy within. Outer 

 Up ascends markedly on the body-whorl, sinuated, contracted, and 

 a little turned in above, expanded, patulous, and wing-shaped in 

 the middle, flat and slightly turned in on the base. It is on the 

 edge rounded, thin, irregularly channelled, with an external, nar- 

 row, projecting varix. The canal is longish, narrow, and very 

 much cut off obliquely backwards. Pillar is short and narrow 

 though strong, but rises from an elongated base ; it bends to 

 the left, and has a long fine edge on the margin of the canal. 

 Inner lip. Above and at the basal tooth it is thick and abrupt on 

 the edge, but below this thin though defined ; it is somewhat 

 thicker along the canal. H. 1. B. 0'36, least 0'29. Penultimate 

 whorl 0'17. Mouth, length 0'28, breadth 0*19. 



8. CeRITHIUM (BiTTITJM) AMBLYTERTJM, n. sp. (a/j/3Avre,oos, 

 rather blunt.) 



St. 75. July 2, 1873. Lat. 38° 38' N., long. 28° 28' 30" W. 

 Fayal, Azores. 500 fms. Sand. 



Shell. — In general aspect very much like C. wietula, Lov., but 

 narrower, and having a sharper apex, and in texture and orna- 

 mentation recalling an Odostomia of the Chemnitzia group. 

 Sculpture. Longitudinals — there are on the last whorl twenty- 

 one small longitudinal ribs, which run more or less continuously 

 straight up the spire ; they are curved so as to be posteriorly 

 convex, and each bears two tubercles — one, the smaller, near the 

 top, the other near the bottom of the whorl ; their interstices 

 are shallow, flat, and narrow. There are, besides these, faint lines 



