276 



development on some Ammonites coming from the Aptien strata of the 

 Caucasus." 



It would therefore seem that A. spiniferum must be regarded as a 

 distinct species and not as a variety of A. Stoliczkanum. 



Olcostephanus Loganianus, Whiteaves. 



Ammonites Loganianus, Whiteaves. — 1876. This volume, pt. 1, p. 27, p. 28, fig. 3 ; 



and pi. 8, fig. 2. 

 Olcostephanus Loganianus, Whiteaves. — 1884. Ibid. pt. 3, p. 211, pi. 23, figs. 1 and 1 a. 



A few specimens of this species were collected by Dr. Newcombe, in 

 1895, on the south side of AUiford Bay. One of these, though a little 

 worn, is in some respects the best specimen known to the writer. 



Olcostephanus cepoides, Whiteaves. 



Ammonites Loganianus, Whiteaves (?) Form B. — 1876. This volume, pD. 1, p. 30, pi. 8 



figs. 1 and 1 a. 

 Stephanoceras cepoides, Whiteaves. — 1884. Ibid., pt. 3, p. 210. 



A few specimens of a rather small, compressed and remarkably Scaphite- 

 like form of this species, with an obliquely transverse constriction just 

 behind the aperture, were collected by Dr. Newcombe at the east end of 

 Maud Island in 1895, and on the south side of Alliford Bay in 1895 and 

 1897. A similar but much larger and more coarsely ribbed specimen, 

 with a valve of an oyster over the umbilical cavity on one side, was col- 

 lected by Dr. Newcombe at Maple Island in 1895. These specimens give 

 the writer the impression that the species is probably an Olcostephanus 

 rather than a Stephanoceras, but its septation is still unknown. 



Olcostephanus (Astieria) Deansii, Whiteaves. 



Olcostcphanas (Astieria) Deansii, Whiteaves. — 1893. Canad. Record of Science, p. 442, 



pi. 7, figs. 1 and 1 o. 



Skidegate Inlet, James Deans : the specimen described and figured 

 in the above mentioned publication, — which is the only one that the 

 writer has seen. 



The original description is as follows : — " Shell small, compressed 

 at the sides and narrowly rounded at the periphery : umbilicus occupy- 

 ing rather less than one-third of the entire diameter. Volutions three 

 or four, increasing rapidly in size, especially in the dorso-lateral direc- 

 tion, and rather closely embracing, about two-thirds of the sides of the 

 inner ones being covered, the outer one a little higher than broad ; 



