THE 
GHOLOGICAL MAGAZINE. 
NEW "SERIES! "DECADE 11 “VOLEY OX: 
No. V.—MAY, 1893. 
Ore arse ALTE: ARTICIES. 
—+>—__ 
T.—On tHE Discovery or A SEcoNDARY ReptTite In MADAGASCAR: 
Srevzosaurus BARON! (N. SP.); WITH A REFERENCE TO SOME 
Post-TEerRTIARY VERTEBRATE REMAINS FROM THE SAME CouNTRY 
RECENTLY ACQUIRED BY THE British Museum (Natura History), 
By R. Buntzen Newron, F.G.S8, 
(PLATE IX.) 
HE Rev. Richard Baron, F.G.S., of the London Missionary 
Society, has sent to the British Museum some interesting 
reptilian remains from the Jurassic rocks of Madagascar, which he 
obtained during 1891, at Andranosamonta village, a locality situated 
in the north-western part of the Island. They were enclosed 
in a tenacious shelly limestone, so that before their examination 
could be proceeded with it was necessary to submit them to careful 
development and cleaning, a work which has been most ably carried 
out by Mr. Richard Hall, the Assistant Formatore of the Geological 
Department. The fragments thus relieved represent some of the 
more prominent parts of a skull belonging to the same animal, 
comprising :— 
(1) An imperfect cranial rostrum, Pl. IX. Figs. 1 & 2. 
(2) An almost complete mandible, Pl. 1X. Figs. 8 & 4. 
(3) Certain posterior parts of the cranium. 
There is also a dermal scute, which although somewhat differently 
localized, vz. two miles south of Andranosamonta, is presumed to 
be a relic of this same reptile, Pl. IX. Fig. 5. 
In glancing at the main features of this animal we note its 
possession of a narrow and elongate rostrum set with numerous 
alveoli, slightly differing in size, and having a more or less circular 
peviphery. 
The teeth are conical, obliquely set, and directed anteriorly ; the 
base of one, showing through the lower surface of the mandible, 
exhibits a smooth carina on one of its exposed sides. 
The premaxille unite to the maxille on the palatal surface by a 
well-marked rectangular suture, which terminates above in a deep 
posterior angle. 
Among the chief characteristics of the mandible may be mentioned 
its long and narrow symphysis occupied by the splenial element, 
extending anteriorly to within 30 centimetres of the front. 
The posterior portions of the head remaining in the matrix 
indicate a fairly well-defined occipital region consisting of an 
DECADE III.—yOL X.—NO. V. 13 
