458 REV. B. BOOG WATSON OK THE 



these and the first regular whorl has a deep sinus above and a 

 very prominent forward curve below. These whorls are orna- 

 mented by a system of minute bars, which 

 for the upper half of the whorl run straight 

 downwards (fig. 1, B) ; there they split into 

 two and form a very regular reticulation on 

 the lower half of the whorl, each mesh being 

 a square. Whorls 11 in all, slightly con- 

 vex, a little high, of very regular increase, 



, , -, . , , .., . Ornamentation on whorls, 



each broadening downwards with great re- apex of P> korm^hora. 



gularity, but very slightly, from the upper 



to the lower suture ; the last whorl is a very little tumid, 

 but short and small, and with a short contracted base. Suture 

 very little impressed, but rendered definite by the very slight pro- 

 minence of the edge of the gemmed band below. Mouth oblong, 

 pointed above and below. Outer lip has a very regular and slight 

 curve from end to end ; the edge sweeps very much back at 

 the front of the shell ; in the middle of the mouth it is excessively 

 prominent and is rounded, leaving between its shoulder and the 

 body -whorl a very deep, rounded, and open-mouthed sinus. Inner 

 lip very thinly excavated in the substance of the shell ; it runs 

 very far forward on the bluntly rounded, twisted, and at the 

 point oblique edge of the pillar, which is short and narrow, and at 

 its junction with the body very markedly concave. H. 04. 

 B. 0-14. Penultimate whorl, height 0-08. Mouth, height 0-16, 

 breadth 0-08. 



I know nothing with which to compare this remarkable species. 

 Clavatula albicans, Hinds, ' Sulphur,' p. 23. no. 84, pi. vii. f. 8, has 

 somewhat of its general features ; but there resemblance ends. 

 Trochus {Margarita) nitens, Jeff., has a somewhat similarly orna- 

 mented suture ; as has also Hela margaritifera, Wats. 



52. Pletjkotoma (Defbajstcta) chaeiessa, n. sp. (xapleis, 

 graceful.) 



St. 24. March 25, 1874. Lat. 18° 38' 30" K, long. 65° 5' 30" W. 

 N. of Culebra Island, St. Thomas, Dan. West Indies. 390 fms. 

 Coral-mud. 



St. 73. June 30, 1873. Lat. 38° 30' N., long. 31° 14' W. 

 "West of Azores. 1000 fms. Globigerina-ooze. Bottom tempe- 

 rature 39°'4. 



