Descriptions of Two New Species of Ammonites. 443 
The writer has much pleasure in associating with this 
species the name of its discoverer, Mr. James Deans of 
Vietoria, V. I., who accompanied Mr, James Richardson in 
his exploration of the Queen Charlotte Islands, in 1872, and 
who has since presented some unusually perfect specimens 
of the fossils of the Cretaceous rocks of those islands to the 
museum of the Geological Survey. Department at Ottawa. 
O Deansii appears to belong to the small group of Am- 
monites of which Olcostephanus Astieri is the type, and for 
which M. Pavlow has recently (1891) proposed the generic 
or subgeneric name Astieria' According to M. Pavlow, the 
Olcostephani of the group of O. Astier? form a natural 
group, a genus (Astieria) if one prefers to consider the 
Olcostephani as a family, or a subgenus if one would rather 
regard Olcostephanus as a genus. 
The shape and surface ornamentation of O. Deansii are 
very similar to those of O. Jeannotti. But in O. Jeannotti 
the ribs bifurcate at the umbilical margin, and are repre- 
sented as so prominent as to everywhere break the general 
contour if the shell is viewed laterally. The siphonal 
saddles of O. Jeannotti, too, are described as broad, and the 
figures show that they are much broader than high. In O. 
Deansii, on the other hand, the ribs bifurcate half way 
way across the sides, at a considerable distance from the 
umbilical margin, and are not sufficiently prominent to 
interrupt the continuity of the outline of the shell in a full 
side view. The siphonal saddles of O. Deansii, also, are 
narrow, and, as already stated, a little higher than broad. 
The genus Olcostephanus, which was founded by Neumayr 
in 1875, is abundantly represented in the Upper Jurassic 
‘and Lower and Middle Cretaceous rocks of Kurope. The 
only other species that has been definitely recorded from 
the Canadian Cretaceous is 0. Loganianus (nobis), from 
Skidegate Inlet, whose characters are still very imperfectly 
known. As stated elsewhere, * however, it is most probable 
that the so-called Haploceras Cumshewaense (nobis), from 
1 Bull. Soc. Imp. Naturalistes de Moscou, Année 1891, N, Ser., vol. v, p. 491, 
2Trans- Royal Soc. Canada, vol. x, sect. iv, p. 114, 
