﻿EXPLANATION OF THE PLATES. 



Plates I.-XXX. 

 [Collotype reproductions of photographs.] 



PLATE I. 



PIQ. 



1. The Type specimen of M. stratiformis, X f, seen from above. 



2. „ „ M. granulosa, X §, seen from above. 



3. „ „ M. explanata, X f , seen from above. 



4. One of the specimens (h) of M. porosa, X f , seen from above. 



5. Type specimen of M. tenuissima, x f , seen from above. 



6. „ „ M. reticulata, X f , seen from above. 



PLATE II. 



1. The Type specimen of 3f. auricularis, x |, seen from above. 



2. „ „ M. pallida, x §, seen from above. 



3. „ „ M. punctata, X f , seen from above. 



4. „ „ M. exserta, x J, seen from above. 



M. crassireticulata, X f, seen from above. 

 M. iolsii, X ^, from the side. 



PLATE III. 



1. One of the Type specimens (b) of if. mollis, X |, from the side. 



2, 3. Specimens (&, c) of M. spongodes, x ^, from the side. 



4. The Type specimen of M. divaricata, X f , from the side. 



5. „ „ M. compressa, X f. 



PLATE IV. 



1. The Type specimen of M. solida, x |, from the side. 



2. Specimen (a) of M. fruticosa, X J, from the side. 



3. The Type specimen of 3f. spatula, X J, from the side. 



4. „ „ M. rotunda, X f , from the side. 



5. 6. Specimens (c, a) of M. gaimardi, x f, the latter (a) with one side smooth. 



PLATE V. 



1, 2, 3. Specimens {a, h, c) of M. ramosa, x i, from side. 



4. Type specimens of M. socialis, X f , slightly tilted. 



5. „ „ M. indentata, X f . 



