394 EEV. E. BOOG WATSON ON THE 



This is a species of interest, both from its habitat and from the 

 simplicity of its rounded whorls and of its sculpture. It exists 

 unfortunately in the form of a mere fragment. It is a good deal 

 like P. planetica, Edw., from the Eocene Bracklesham beds (see 

 Eocene Moll, Palaeont. Soc. p. 212, pi. xxvi. fig. 3), but has not the 

 flatly constricted band below the suture, which in that species 

 throws the whorls out in a high rounded shoulder. In P. rostrata, 

 Edw. (J. c. p. 218, pi. xxvi. fig. 8), though with less of a shoulder, 

 there is a broader constricted belt, and there are traces of longi- 

 tudinal ribs. 



5. PLEUEOTOMA (SukCULA) GONIODES, U. sp. (ywvuoSrjS, 



angular.) 



St. 320. Eeb. 14,1876. Lat.37° 17' S.,long. 53° 52' W. S.E. 

 of La Plata. 600 fms. Hard ground. Bottom temperature 

 37°-2. 



Shell. — High, narrow, biconical, subscalar, with a long, uncon- 

 stricted base and a subequal-sided snout, angulated with an ex- 

 pressed keel, and with regular fine spiral threads all over. Sculp- 

 ture. Longitudinals — there are only fine, regular, close, hair-like 

 lines of growth. Spirals — in the middle of each whorl is a strong 

 angulation formed by the straight drooping line of the shoulder 

 and the straight contracting line down to the inferior suture ; 

 the angulation is pinched out into a sharp round-edged keel ; there 

 are fine sharpish threads on the whole surface pretty equally dis- 

 tributed and of equal strength ; of these there are on the penul- 

 timate whorl below the keel about 6 ; they are parted by flat 

 broadish intervals, strongly scored with the lines of growth. 

 Colour white under a yellow epidermis. Spire high, narrow, 

 conical, with profile-lines interrupted by the straight -lined con- 

 traction of the shell between the keels of the successive whorls. 

 Apex (eroded) small and rounded. Whorls 6-7; their profile con- 

 sists of two straight lines meeting in the keel which bisects the 

 whorls; above is a slowly sloping shoulder, and below a gradual 

 contraction to the suture ; the last whorl is scarcely convex on 

 the conical base, which contracts with great regularity to the long, 

 nearby equal-sided snout. Suture fine, linear, but well defined. 

 Mouth club-shaped, being rhomboidal above, with a long narrow 

 canal below. Outer lip high-arched and then straight along the 

 canal ; its edge retreats at once to the left, and forms a remote, 

 deep, rounded sinus in the shoulder above the keel ; below this 



