56 
ICHTII Y OCAMPUS TRYONI, Sp. UOV . 
D, 18.? A. ? P. 8. C. 8. Osseous rings 17/36. 
Length of head ten and one-sixth in the total length, and 
three and four-fifths in the distance between the tip of the 
snout and the vent, which distance is two and four-fifths in 
the total length. Snout very short, three-eights of the length 
of the head, and five-sixths of the postorbital space. Body 
compressed, much deeper than broad. Snout turned upwards 
at the tip ; its posterior half bearing a high sharp arcuate 
ridge bifurcated behind, the divergent branches meeting the 
supraciliary ridges, which are moderately developed : inter- 
orbital space traversed by a low median ridge, which is 
continuous with the rather indistinct nuchal ridge : a low 
curved opercular ridge : all the body ridges acute, those of the 
dorsal profile so much so as to cause a deep concavity along the 
whole length of the trunk and tail : lateral ridges straight, 
ceasing on the second or third caudal ring : abdominal ridge 
well developed. Ovisac extending over sixteen rings, and 
rather more than two-fifths of the length of the tail without the 
small caudal fin. The dorsal fin stands upon the five anterior 
caudal rings. Colors — Head, back, and sides brown, faintly 
mottled with lighter j under surface pale yellowish-brown 
with the exception of the marsupial region which is black. 
The unique example on which this species is founded was 
dredged in Moreton Bay, Queensland, in my presence early in- 
May, 1886, and I embrace this opportunity of naming the 
species after my friend, Mr. Henry Tryon, in remembrance 
of the very pleasant collecting trip which we enjoyed 
together there. The specimen measures but two and three- 
fourths inches, but from the perfect development of the egg- 
pouch I believe it to be fully adult. The high rostral ridge 
separates this species at a glance from /. cinctus, while the 
interrupted lateral ridge equally distinguishes it from I. carce, 
in which that ridge is curved downwards opposito to the vent 
so as to join the inferior caudal ridge. 
DESCRIPTION OF A NEW AUSTRALIAN TORTOISE. 
By J. Douglas Ogilby. 
Chelodina rugosa, sp. 710 V . 
(Plate vii.) 
Carapace ovate, somewhat pyriform, narrower anteriorly, 
slightly emarginate behind, without vertebral keel, deeply 
sculptured. Nuchal plate between two marginal plates : eighth 
