280 



" Maximum diameter of the only specimen, collected, twenty-nine milli- 

 metres : greatest breadth of the same, twelve mm. 



" The specific name suggested for this little Ammonite is a modification 

 of the word Hai-da-kwe-a, which Dr. G. M. Dawson quotes as the Indian 

 name for the Queen Charlotte Islands, in his report on these islands, pub- 

 lished in the Report of Progress of the Gleological Survey of Canada for 

 1878-79.* The shell itself appears to belong to the sub-group Dentati- 

 regulares of the Dentati, of Pictet's classification of the Ammonites in the 

 " Paleontologie Suisse,"! and to that section of the genus Hoplites which 

 Zittel calls the group of Ammonites uiterruplus. | In many of its charac- 

 ters it is very similar to Hoplites sinuosus, but it seems to have fewer and 

 more distant i-ibs than that species and a different sutural line. Thus the 

 type and only known specimen of ff. Uaidaquensis has twenty-two ribs 

 on the outer volution, while that of H. sinuosus, which is almost exactly 

 the same size, is said to have thirty-four. The sutural line of H. Uaida- 

 quensis seems to be more like that of H. crassicostatus, as figured by 

 d'Orbigny,|| in which che first and second lateral saddles are represented 

 as broader than high, whereas the corresponding saddles of H. sinuosus 

 are represented as higher than broad." (Op. cit.) 



Hoplites Yakounensis. (N. Sp.) 

 Plate 36, tigs. 1,1a and \h. 



Shell small, compressed, rather narrowly umbilicated, periphery or ven- 

 ter narrow and subtruncated. Volutions so deeply embracing that the 

 greater part of each of the inner ones is covered, the umbilicus occupying 

 a little less than one-third of the entire diameter, the outer one flattened 

 somewhat obliquely outward from the margin of the umbilicus. Aperture 

 narrowly elongated, much higher or longer than wide, subtruncate both 

 above and below, widest and deeply emarginate below. 



Surface of each side of the outer volution mai'ked with a single row of 

 about ten small, transversely elongated, conical tubercles on the umbilical 

 margin, and with a corresponding row of from two to three times as many 

 small, obliquely and slightly elongated tubercles on the outer margin of the 

 periphery or venter. Across each of the sides these two sets of tubercles 

 are connected by faint, obscure and almost obsolete, radiating and bifur- 

 cating costse, but a few of the tubercles on the peripheral margin mark the 

 termination exteriorly of short intercalated ribs that do not reach to the 

 umbilical margin. 



* Page lOlB. 



t Premiere par: ^ 



: Handbuch der Palseontologif vol. ii, p. 476. 



II Paleontologie Fran9aise, Terrains Cretaces, tome 1, Atlas, pi. 59, fig. 3. 



