OF NEW SOUTH WALES. 89 



extreme tenaity. Generally the outer lip or labrum slopes away 

 in a smooth acute edge. In figure 4 we have an instance of a 

 distinct sinus near the suture very like what is seen in the 

 marine genera Daphnella, Bela, Mangelia, 8fc. This is supposed 

 to be connected with a slit in the posterior side of the mantle of 

 the animal. In the shell figured, probably the animal had a 

 mantle thrown more forward in the direction of the centre of the 

 lips, and the apparent sinus is due to the secretion of the shell 

 being more abundant in that direction. It affords a curious 

 instance of an abnormal character being imitative and apt to 

 deceive collectors who rely upon a single individual. The 

 specimen, when handled, shows the sin as in a more remarkable 

 manner than can be expressed in a figure. The plaits or rugose 

 edges of the whorls at the suture are not visible on the larger 

 specimens, while on the smaller they extend down the whole 

 length of the shells. In some shells, and generally the small 

 ones, the surface is shining and almost polished, but in the 

 others, especially those which are globose, the surface is silky, 

 and under the microscope has a decussated appearance like woven 

 cloth. In these specimens the spiral striae are close and con- 

 spicuous, especially towards the summit. 



I have mentioned already that the color varies but within 

 certain limits, and were it not for these limits and a certain 

 general resemblance in the pattern, I am sure many species 

 would have been made of Bulimus Dufresnii. This general 

 resemblance is] in the permanence of one or two spiral yellow 

 bands on the basal whorl. The body color varies from light 

 yellow (fig. 7a), chestnut brown (fig. 6a), rich deep maroon 

 brown (fig. 4), and dull pale olive (fig. 6b). The last whorl has 

 generally all underneath the spiral bands of a deeper color than 

 the rest of the shell, and when the color is yellow or olive this is 

 a deep rich brown. When there are two yellow bands the 

 space between has a deep brown narrow band. There seem 

 but few exceptions to this. Sometimes there are two of the 

 brown bands. The width of the yellow band varies in every 

 individual and its color. I have seen a shell of a pink white 



