992 Dr. Gould’s Descriptions of Shells. 
Nucuua BicUsPIDATA. Pl. XXIV. Fig. 8. 
esta albà, transversá elongato-ovatá, sub-cylindricá, anticé rotundatà et 
triplicata, posticé productà, tricarinatà, bicuspidatà ; valvis obliqué coneinné 
aratis,. preter spatio excavato inter carinas serratas; cardine dentibus 
anticis ad 12, posticis ad 26. 4 
Long. 2; alt. 1 poll. 
Shell milk-white, shining, elongate-ovate, sub-cylindrical ; 
anterior extremity rounded, having three very distinct folds 
radiating from the beaks ; posteriorly produced, and rendered 
emarginate by a deep, smooth excavation running from the 
beaks between the acute, serrated keels, two of which are 
approximate and above it, near the upper margin ; the other 
running to the inferior posterior angle, and terminating in 
projecting points. 'The sides are obliquely and regularly 
grooved, with fine acute striæ. The serratures of the carin® 
are produced by the strie of growth, and there are two to 
each of the oblique furrows. Teeth of the hinge about 1? 
_ before, and 26 behind the beaks. Interior highly polished ; 
. cavity of the beaks profound. 
Nassa TunBINEA. Pl. XXIV. Fg 10. 
Testa solidà, ovata, apice productá, albidà ; anfr. 9 sub-tabulatis, plicis 
umerosis acutis et ae volventibus profundis ad 13 de cussatis; basi 
spiraliter striati; apertura à parva, stricta, angulato-ovali ; 
erenulato, intus ME yaks columellari.erecto, granulato 
Long. 3; lat. } poll. 
Shell solid, whitish, topshaped ; whorls nine, the last one 
very large, and sub-globose, the posterior whorls not conforming 
to the others, but prolonged into a slender apex, so that bes 
profile outline of the shell is concave. Surface cov 7 
regular and numerous sharp folds, which are crossed by deep 
and regular revolving stris, about 4 on the posterior, 
on the large whorl, thereby producing a regularly granulatec 
surface; around the canal are fine spiral lines. pet 5 
small, narrow, elliptical, angular above ; lip ome somewhat 
‘inflected, deeply sulcated within ; columella with 
folds, and an erect callus; canal broad and strongly cect 
labio acuto, 
