42 SYNOPSIS OF THE CHARACTERS OF THE 



MuRCHISONIA ELONGATA. Portk. 

 Murcbisonia elongata. Portk. Geol. Kep. 



Sp. Ch. — Very elongate ; spire acute, of eleven angular, gradually increasing whorls ; two keels bounding 

 the band on the angle, with two keels above, and two below, at equal distances. 



This shell is intermediate in character between the M. angulata, Phil., and M. quadricarinata, M'Coy, 

 but perfectly distinct from both. Length nine lines, diameter of last whorl four lines. 



MuRCHisoNiA Larcomi. M'Coy. (PL V. fig. 8). 



Sp. Ch. — Spire of ten rounded volutions, each having slightly above the centre a fiat mesial band, boimded 

 by two rounded keels, above which are two smaller keels, and below wliich are two similar keels, on aU but 

 the basal whorl, which has three. 



This pretty species is one of the most elongate of its genus ; with the exception of the keels, the surface is 

 smooth. Length one inch, diameter of basal whorl five lines. 



MURCHISONIA QUADRICARINATA. M'Coy. (PI. V. fig. 9). 



Sp. Ch. — Elongate, conic ; whorls numerous, gradually diminishing in size, angular, the principal angle 

 or keel being rather below the centre of each whorl ; there are two smaller keels below the principal keel, and 

 one above it, on each whorl ; sutures prominent ; surface nearly smooth, with slight traces of oblique striae. 



This species is alHed to the M. angulata, Phil., but the number of its keels, and slender form, distinguish 

 it from all of the genus. Length four and a half lines, diameter of last whorl one and a half Hnes. 



MdRCHISONIA SULCATA. M'Coy. (PI. V. fig. 10). 



Sp. Ch. — Acutely conical; spire of four gradually increasing, very convex whorls; the whorls of the spire 

 have foui', and the basal whorl five broad, rounded, smooth, spiral, nearly equal grooves, separated by sharp 

 ridges ; umbilicus very small. 



This species is remarkable for the great convexity of the whorls, and their very gradual increase, the basal 

 turn being very little larger than the one preceding it ; two of the spiral ridges on the most prominent part 

 of each whorl seem to include the band between them. Length three and a half lines; diameter of last whorl 

 three lines ; thickness of last turn one and a half lines. 



Elenchus. Hum. 



Gen. Ch. — Trochiform, spire lengthened; body whorl small, smooth; imperforate; base of the pillar with 

 a prominent angle or tooth. 



Elenchus ANTiQuus. M'Coy. (PL V. fig. 18). 



Sp. Ch. — Ovate, smooth, spire pointed, of four slightly convex whorls; mouth half the length of the shell; 

 pillar slightly thickened, obsoletely notched at the base ; outer lip thin, straight ; body whorl inflated ; base very 

 short. 



This interesting shell may be distinguished from all the species of Macrocheilus, by the minute notch at 

 the base, and the short, sHghtly thickened, and twisted pillar. The general form is buccinoid or gibbous ovate ; 

 the surface is smooth, with very fine, direct, transverse striae. Length seven Hnes, width four Hnes. 



Elenchus subulatus. M'Coy. (PL V. fig. 19)- 



Sp. Ch. — Elongate, subulate, spire of about six or seven flat, smooth whorls ; mouth ovate, rounded ante- 

 ally, narrow retrally ; a small strong tooth on the pillar Hp ; right Hp simple. 



This species belongs apparently to that splendid little group of New Zealand sheUs, long ago distinguished 



