ales. The foot is divided into three portions, the anterior portion 

 slightly wider than the other sections, rounded in front and strongly 

 auriculated, the middle section slightly larger than the other sections, 

 rounded in front and sides, the last division longer and narrower than 

 the others and rounded posteriorly. Whether these divisions repre- 

 sent the propodium, mesopodium and metopodium respectively I do 

 not know. Forbes and Hanley say in regard to the English species, 

 "The foot is sulcated across the centre so as to form two creeping 

 disks." These authors describe the animal as creamy white. It has 

 been stated that in the Melampidx the protoconch is reversed. Plate 

 IX, Figure 46 shows the young shell of Melampus bidentatus and the 

 nucleus while somewhat oblique has a dextral turn of the spire at the 

 outset, as shown in PI. IX, Fig. 46 A. 



On Plates VIII and IX are collected together the figures of the 

 shells of the early stages of thirteen species referred to in the text. 

 On the lower part of Plate IX are figured the young of three species of 

 which the soft parts of the adult form I have not secured. Figure 47, 

 Plate IX is probably that of Diaphana dehilis. It illustrates very 

 clearly the transference of the sinistral nucleus into the final dextral 

 form of the shell. The planorbular reversed nucleus is also clearly 

 shown in Figure 47 (A). In Figure 48, Plate IX is given the early 

 stage of some species of Philine. The reversed nucleus is nearly 

 upside down, the lines of growth shows its methods of transference 

 into the dextral shell. Vermeius lumbr kalis, (Figure 49, Plate IX) 

 shows two whorls of the protoconch perfectly smooth and then begins 

 the sharply carinated ribs which mark the adult shell. 



22 



