PKESTON : ON ENNEAS FROM S. NIGERIA. 



135 



EXNEA OPOIiOENSIS, n.sp. 



Shell perforate, ovate (in dead condition grayish-white), whorls 6, 

 the first four regularly increasing, tlie fifth increasing in length, hut 

 not so much in breadth, the sixth also increasing regularly in length, 

 but diminishing in breadth, the upper whorls smooth, the remainder 

 sculptured with moderately, closely-set, oblique costulse, which 

 become rather more distant on the hist convolution; suture impressed; 

 umbilicus very narrow, deep ; columella-margin a little obliquely 

 descending; labrum pure white, narrowly outwardly expanded; 

 aperture taking the form of an inverted and truncated triangle, armed 



with a large, broad, projecting, somewhat claviform, parietal tooth, 

 a broad and bifurcated tooth on the inner margin of the labrum, of 

 which the lower furcation is the weaker, a small, slightly interiorly 

 situate, basal denticle, a well-marked, upwardly tending lamella on 

 the median part of the columella, and, above this, a minute denticle 

 at the point of its junction with the parietal wall. Alt. 3'75, diam. 

 maj. 2'25 mm. Aperture: alt. '75, diam. •5mm. 



TLih. — Onoha or Lokar, Opobo District, S. Nigeria (Lieut. L. 

 Rees, R.A.). 



Ennea reesi, n.sp. 



Shell perforate, cylindrically claviform, rather thin and vitreous, 

 pale yellowish-green ; whorls 7^, the first four and a half regularly 



increasing, the fifth increasing in length, but proportionatelj- less in 

 breadth, the last two also increasing in length, but decreasing in 



