204 Kathleen K. Oliver: 



The interlocking apparatus is faintly marked, the papilla-like 

 structure on the wall of the Truncus being the only indication 

 of it. There is one very definite synangial valve on the left 

 lateral, and ventral side (Fig. 14 v.^), and a narrow flap of skin 

 fused to the top of the spiral fold on the right and attached 

 across the dorsal side of the Truncus just above the opening 

 of the Pulmo-cutaneous arch. (Fig. 14 v.2) The semilunar 

 valves are placed laterally, without any dorsal and ventral 

 papillae. Taken altogether, this genus appears to be further 

 from the usual structure of the Truncus than any of the so 

 far worked families or crenera. 



BUFONIDAE. 



1. Notaden hennetti. (Plate XXXIX., Fig. 15.) 



The spiral fold is here most definitely curved, and has a 

 thick, coarse edge. 



The interlocking apparatus is represented by a very faint 

 papilla on the wall of the Truncus, opposite the top curve of 

 the spiral fold, into which it presumably fits, instead of having 

 a separate indentation as in other genera. 



The synangial valves (Fig. 15 viv2) are two in number, both 

 approximately of the same size. The right end of the right 

 valve being, as usual, fused to the spiral fold, and attached at its 

 left end to the spot from which the left valve springs. The spot 

 at which the right and left valves join each other is immediately 

 above the opening of the Pulmo-cutaneous arch. 



The Carotid papilla is very marked, and relatively large. The 

 semilunar pylangial valves (Fig. 16 x^v"^) are closely opposed 

 when shut, there being no papillae on the dorsal and ventral 

 sides. 



In a longitudinal horizontal section (Fig. IT), the very dis- 

 tinctly spiral form of the spiral fold will be clearly seen. 



i'. Ft^eudopliryne semimarniorata. 



This genus is too small for dissection, so the structure can 

 only be arrived at by means of sections. 



There are apparently two synangial valves (Fig. 18 vH'*), 

 much the same as in other genera, and the spiral valve seems 



