BY F. RATTE, ENG. ARTS AND MANUF., PARIS. 1167 



Plate 69,fig. 1,1a, lband2. Helicoidal 3hell. Occurs dextrorsum 

 or sinistrorsum round the stems, section ogival, showing a longi- 

 tudinal costa. Shell finely striated with lines of growth. Helix 

 of two rounds and one half, diameter 1\ millimetres (fig. 1, etc.) 

 The shell represented by fig. 2 differs somewhat in general 

 appearance from fig. 1, but the striation is the same and it is 

 probably the same species. The last one was found at Manly by 

 Mr. Ramsay. 



Plate 69, fig. 3, 4, 6, 8, 8a, 1 1. The commonest species. Is 

 easily distinguished by the granulations of its lines of growth. 

 These exhibit ornamentations which recall some forms of wall 

 stalactites (fig. 8 and 11.) This shell is also very dark, especially 

 on the tubercles. These ornaments are irregularly disposed in 

 front of the shell, but on each side follow each other, forming a 

 continuous serrated costa Length of shell, 15 millimetres. 

 Attached to the stem along it3 whole length. Plate 70, fig. 1, 2, 

 4, 5, 10, represent five different stages of the larva enlarged 10 

 times and on a smaller scale, the imago from the ornamented shell, 

 (fig. 3 etc.) Fig. 1, as found in July, 3 millimetres. Fig. la 

 the shield shaped anal plate enlarged. It acts as an operculum. 

 Fig. 10, the imago drawn only double size. Length of body, 7 J 

 millimetres. Alar expansion, 14£ millimetres. Thorax and 

 scutellum light green and transversely striated. Among the 

 imagos obtained from the common shells there are some much 

 smaller, soaiewhat differing in shade, having the wings better 

 marked than the others, which are probably the males. 

 Length of body, A\ millimetres. Alar expansion, 10^ millimetres. 



Plate 69, fig. 3a, 10 represent the shell of another species, 

 the largest among the species described. Section ogival, 

 rounded, and narrower at the mouth. The surface is 

 marked with lines of growth and is somewhat lustrous with a 

 light shade of buff, darker near the mouth. These shells soon 

 lose their colours under the sun, those of the preceding year being 

 perfectly white. It is obvious that the younger lines of growth, 

 near the mouth of the shell, are likely to exhibit the colours in a 

 fresher state. Fig. 10 represents a shell which has been broken 

 and mended. A piece of the broken part is seen cemented on the 



