PLATE XXXIX. 



•10. 



1. Umbonula* verrucosa, p. 317; littoral form. 



2.  -, with ocEcia, from deeper water. 



3. PORELLA STRUMA, p. 329. 



4. . 



5. , older state. 



G. SCHIZOPORELLA SANGUINEA, p. 252. 



7. • ■, erect growth. 



8. MUCRONELLA PAVONELLA, p. 370. 



9. , incru sting form. 



10. , erect foliaceons form. 



* The name stands as UmhoneUa in the text ; but this Ibrm has ah-eadj" 

 been employed as a generic terra. 



