Plate XII. 



(All the specimens are in the collection of the Museum of Comparative 

 Zoology at Cambridge. The illustrations are slightly reduced.) 



Page. 

 Figs. 1-3, 5-12. Clavilitlics subscalaris, a series of specimens showing the 

 principal varieties of this very variable species, as described in the 

 text. Fig. 9 is the type. (1071, 27751, 27751, 27769, 27749, 1070, 27742, 



27745, 1077, 1077, 27744) 1 14 



4. Clavilithes parisiensis ( 1072) no 



(180) 



