XVI 



LIST OF WOOD ENGRAVINGS. 



Fig. 

 XXVIII. Diagram of Dactylopora chjpeina 



XXIX. Diagram of Dactylopora reticulata 



XXX. Diagram of Dentaline Nodosaria 



XXXI. Diagram of Frondicidaria 



XXXII. Various forms of RotaUna 



XXXIII. Abnormal forms of CaJcarina 



XXXIV. Specimens of Philippine variety of Cakarina 

 XXXV. Specimens of ^Mediterranean variety of Calcarina 



XXXVI. Abnormal forms of Calcarina 

 XXXVII. Stracturc of Patellina lenticularis . 

 XXXVIII. Structure of Patellina Cooki 



XXXIX. Irregular disposition of septa in OpercuUna . 



XL. Vertical section of three outer convolutions of OpercuUna 

 XLI. Section of septa of OpercuUna, showing secondary pores 

 XLII. Vertical sections of six specimens of OpercuUna 

 XLIII. Septal planes of four specimens of OpercuUna 

 XLIV. Front view of septal plane closing-in last chamber of OpercuUna 



XLV. Section of Heterosteyina through median plane 

 XL VI. More enlarged portion of similar section 

 XL VII. Vertical section of young Heterostegina 



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