250 RET. E. BOOG WATSON ON THE 



spiral threads gives the curve of the whorls a slight angulation, 

 which is strongest at the carinal or highest of the three threads ; 

 the base is rounded and scarcely at all projecting. Suture lies 

 in the bottom of a deep and broad angular constriction, and is well 

 marked above by a minute round thread. Mouth small, gibbously 

 oval, slightly pointed above and in front of the pillar. Outer lip 

 thin, advancing very little at its junction with the body, and there 

 a little contracted, slightly patulous in all the rest of its sweep. 

 Pillar very perpendicular, concave and narrow. Inner Up is 

 carried across the body as a thin glaze ; it spreads out a very 

 little just at the base of the pillar, up which it advances with a 

 very narrow and slightly angulated, but not at all reverted edge. 

 H. 0-36. B. 0*1. Penultimate whorl, height 0-05. Mouth, 

 height 0-05, breadth 0-048. 



This is a little shell of remarkable beauty. Its generic place 

 has been very difficult to determine. Its outer lip is a little 

 chipped, which has added to the difficulty. There are none of the 

 microscopic spirals which characterize Turritella. There is no 

 such siphonal canal as would justify its being classed as a Ceri- 

 thium. The longitudinal sculpture separates it from Mesalia. 

 Mr. Edgar Smith recommended Fenella, where it is now placed, 

 because nothing more satisfactory suggests itself. Mr. A. Adams's 

 diagnosis of the genus * " . . . labro simplici, acuto, non reflexo, 

 incrassato aut varicoso," implies that the outer lip is not reflected, 

 but is either thickened or varicose. In none of the species de- 

 scribed is this feature mentioned ; and Mr. E. Smith assures me 

 that among the Fenellas of the British Museum, " of which we 

 have several species and many specimens, I do not find any 

 thickening or varix on the labrum." It seems probable, there- 

 fore, that Mr. Adams's thought was " non reflexo, incrassato nee 

 varicoso," and that " aut " slipped in by accident and transformed 

 his meaning. Still, a slight difficulty remains, since the aperture 

 is not quite " Integra antice^ as the old lines of growth indicate, 

 in spite of the chipped lip ; but the indication of an " emargina- 

 tion " is too slight, as is said above, to allow the shell being placed 

 under Cerithium. 



Dunkeria, Carp. 



DUNKERIA FALCTFEEA, n. Sp. 



St. 56. May 29, 1873. Lat. 32° 8' 45" N., long. 64° 59' 35" W. 



* Ann. & Mag. Nat. Hist. 1864, xiii. p. 40 ; Journ. de Conch. 1868, p. 47, 

 pi. iy. fig. 5. 



