186 Mr. G. A. Boulenger on new 
Fig. 4. A and B, two spaces containing a mixture of small Chlorochy- 
trium segments and of developing diatoms. C and D, two other 
spaces with very few green fission-products, but with many 
much elongated diatoms of the Mitzschia type. 
Fig. 5. A, an epidermal cell full of Chlorochytrium. B, two other cells 
containing Chlorochytriwm which seems about to divide into 
fission-products. C, another epidermal cell containing Chloro- 
chytrium which has divided into several nearly equal segments. 
D, an epidermal cell containing many small segments which 
had assumed a yellowish colour and were beginning to elon- 
gate. E, an epidermal cell containing diatoms mixed with 
some green fission-products. IF, another epidermal cell con- 
taining a number of diatoms, but only twe green Chlorochytrium 
fission-products. All these diatoms resembled small Navicule. 
Fig. 6 shows diatoms developing from the fission-products of Chloro- 
chytrium Lemne. A, four contiguous spaces, of which the 
upper one contained a mixture of minute fission-products and 
of diatoms, that on the left diatoms in an early stage of deve- 
lopment, while the other two were densely packed with more 
mature Navieule. B, two large contiguous spaces containing 
an intimate mixture of fission-products and of developing 
diatoms. C, another space containing some fission-products 
and a number of diatoms larger than are usually to be found 
within the sub-epidermal spaces of the ivy-leaf duckweed. 
1X.—Descriptions of Three new Batrachians from Tonkin. 
By G. A. BouLencer, F.R.S. 
A COLLECTION made by Mr. H. Fruhstorfer, of Berlin, in the 
Man-Son Mountains, Tonkin, altitude 3000-4000 feet, and 
purchased from him by the Trustees of the British Museum, 
contains, in addition to several little-known frogs (Lepto- 
brachium carinense, Bler., L. pelodytoides, Blgr., Hyla 
simplex, Bttgr., Rana Guenthert, Blgr., R. graminea, Bler., 
R. nigrovittata, Blyth, R. Ricketti, Blgr., Oxyglossus Mar- 
tensti, Peters, Rhacophorus verrucosus, Blgr.), examples of 
three new species, one of which is even entitled to be regarded 
as the type of a new genus, 
OPHRYOPHRYNE, gen. nov. 
Pupil horizontal. Mouth small, toothless, inferior. Tongue 
pear-shaped, adherent, entire, swollen and cup-shaped behind. 
Tympanum distinct. Fingers free, toes nearly free, the tips 
not dilated. Outer metatarsals united. Omosternum carti- 
laginous ; sternum with a slender bony style. Sacral vertebra 
with very strongly dilated diapophyses and one condyle for 
articulation with the coccyx. 
Like Cophophryne, Blgr., this genus presents an interesting 
