79/3 GA GAT IC ERAS v 



Aug. 



Genus, BRODIEIA, S. Buckman 



1898, Mon I. O. Amm., Suppl. pp. xii, xxxi. 



"Type: Brodieia curva, sp. n." (p. xxxi). Forestalled by Brodia 

 (p. xxxiii). 



Genus, BRODICERAS, S. Buckman 



i8gg, Mon. I. O. Amm., Suppl. p. xxxiii. 



" It is necessary to substitute Brodiceras for Brodieia above." 



Genus, WHITBYICERAS, nov. 

 Type, Am. pinguis, Simpson (see No. 80). 



Like Brodiceras, but distinguished by a definite carinati-bisulcate 

 venter (carina septate), and by a different radial line— it has less lateral 

 flexure and much more peripheral projection. 



The rib-curve is much like that of Pseudogrammoceras, S. Buckman ; 

 but the style of growth — stout whorls with small umbilicus — is quite 

 different, showing it to be connected with the series (there are several 

 stocks) temporarily ranged under Brodieia (Mon. Suppl. p. xii), later 

 Brodiceras (see above). 



Family, LIPAROCERATIDiE, Hyatt 



Uncarinate, costate serpenticones, which in the main become 

 bituberculate serpenticones with swollen whorls, and sometimes ulti- 

 mately sphaerocones. The suture-line passes from simple to complex, 

 but is not retracted umbilically. 



Family, ECHIOCERATID.E, nov. 



Uncarinate, costate serpenticones become carinate and carinati- 

 bisulcate serpenticones with compressed whorls, the suture-line remaining 

 simple. Though the early (costate) stage is similar to Liparoceratidae, 

 the later stage with carination is very distinct. Bituberculation is not 

 known. 



The series comprised in this family may be primitive Hildoceratidae, 

 but the geological separation is considerable, and as direct connection 

 is not apparent, a separate name is useful. The Hildoceratidae have 

 probably passed independently through similar stages, perhaps along 

 more than one line. 



Genus, GAGATICERAS, nov. 



Type, Am. gagateus, Young & Bird (see No. 78). 



Capricorns distinguished from Androgynoceras, etc. (I, Hi) by simple 

 suture-line, polygyral characters, bead-like ribbing of inner whorls and 

 a suggestion of carination. From Bijericeras (II, Hi) by this last character, 

 by lacking the smooth larval stage and by a simpler suture-line. From 

 Echioceras, Bayle, by the shortness of the EL, and the more primitive 

 character of the whole suture-line, while in Echioceras the ribs of the 

 inner whorls are small, plain, and very approximate. 



