d2 PKOCBEDINGS OP THE MALACOLOGICAL SOCIETY, 



Foot long and narrow, the hinder part laterally compressed 

 but not keeled, the top being excavated beneath the shell but 

 raised posteriorly in front of the large caudal mucous pore, which 

 has the form of a vertically elongated slit. Sole truncate in front 

 and rounded behind, tripartite by a pair of longitudinal grooves, 

 the central area being equal in width to each of the lateral areas, 

 excepting towards the hinder end, where it becomes narrower 

 owing to the convergence of the longitudinal grooves, which meet 

 at the extremity. Foot-fringe and lateral areas of sole crossed by 

 numerous transverse grooves. Peripodial grooves well marked, 

 bending upwards in front of the caudal mucous pore ; ciliated 

 epithalium of foot-fringe extending on to the lower sides of the 

 peripodial grooves. Rather irregular radial grooves occur on 

 each side of the hinder part of the foot, where there is also 

 a longitudinal brown band. 



Head and Neck with well-marked lateral grooves ; dorsal 

 grooves ill defined; vertical facial grooves absent, the front of the 

 head being covered with small rugse. Genital opening in the right 

 lateral groove on the side of the head, about 2 mm. from the right 

 upper tentacle. 



Pallial Lobes, comprising a pair of rather narrow, finger- 

 shaped shell-lobes, one on each side of the shell, and about 3 mm. 

 long in a specimen preserved in alcohol ; together with right and 

 left, slightly granular, body-lobes — the right forming a wide 

 triangular flap beneath the respiratory opening and the right 

 shell-lobe, the left being very broad and extending uninteirruptedly 

 from the respiratory opening over the neck and along the left 

 side of the animal to a point a little behind the origin of the left 

 shell-lobe. 



Dorsal Skin lining the shell opaque Avhite, except for some 

 translucent vein-like markings above the albumen gland, and for 

 the area over the lung, which is also translucent, like the skin of 

 the concealed undersides of the whorls. 



Lung short and somewhat wedge-shaped, being broad at the 

 mantle-edge, but rapidly narrowing as it extends backwards. 

 Roof of lung richly vascular, doubtless in order to compensate for 

 the reduction of its area due to the encroacjiment of other organs 

 normally occupying the spire. Main pulmonary vein coming 

 towards the pericardium from the neighbourhood of the 

 respiratory opening, but having numerous branches, including a 

 large vessel from the left of the lung which unites with it close to 

 the heart. Numerous short veins cross the narrow area to the 

 right of the kidney, and these are mostly bordered with white. 



Aorta dividing into two vessels soon after leaving the ventricle. 

 The posterior passes backwards and then divides into two arteries 

 which supply blood to the liver, etc. ; the anterior bends round the 

 loop of the intestine, gives off an artery to the salivary glands, 



