266 The Philippine Journal of Science w« 



Natica marochiensis Gmel. 



Martin, Foss. v. Java, PI. XXXVIII, figs. 616, and 617. 



The Philippine form is larger, but in other respects, especially 

 the umbilicus, it is an exact duplicate of the specimen from 

 Java. 



Locality : Agusan River, Mindanao, No. 1054. 



Formation : Recent shales. 



Natica rostalina Jenk. (?) 



I found nothing in the Javan collection corresponding to this 

 save one specimen labelled N. rostalina. The suture of the 

 Philippine specimen is much deeper. The umbilicus is not 

 visible. 



Locality: Cebu, white limestone cliffs, Minanga River on To- 

 ledo road, No. 277. 



Formation: Pliocene ? 



Natica (Lunatia) sp. Plate IV, fig. 13. 



This may be merely a variety of Natica globosa. It is so small 

 and featureless that it would not be safe to refer it definitely to 

 any species. 



Polynices (Natica) mamilla Lam. Plate IV, fig. 14. 

 Martin, Tertiarscht. auf Java (1880), 81. 



The Philippine and Javan forms are so nearly identical that 

 they might very readily be confused. In some of the older 

 specimens from Java it was noted that the umbilicus had become 

 completely filled with nacreous matter. 



Locality : Agusan River, Mindanao. 



Formation : Recent sandy shales. 



TRITONIDJE 



BURSA Bolten 



Shell oval or elongated, compressed front to back with 2 

 opposite lateral connecting varices; canal short, somewhat bent 

 backward. Recent and Tertiary. (Zittel.) 



Bursa (Ranella) subgranosa Beck. Plate IV, fig. 15. 

 Reeve, Monogr. Ranella, PI. I, sec. 1. 

 The specimen in the Philippine collection differs only slightly 

 from both the Javan forms of this species and B. spinosa, but 

 is more like the former. A large number of specimens of 

 these two species probably would show complete gradations 



