OCR Text |
Show 1886.] COLUMELLA OF ICHTHYOSAURUS. 407 long inferior border, decidedly marked off from a short posterior border, but the precise nature of its original articulation is unfortunately not apparent. The pterygoid seems to have slipped somewhat from its natural position. Fig. 1. Fig. 2. Fig. 1. Right columella of Ichthyosaurus, much crushed ; inner side view [B.M., No. 2000. 40 * .] Fig. 2. Lower portion of right columella of Ichthyosaurus; outer side view : pt, pterygoid ; 0, crushed bones in orbit. [B.M., No. R 44.] Fig. 3. Lower portion of left columella of Ichthyosaurus intermedius • inner side view. [B.M., No. 2000.15.] Fig. 4. Left columella of Hatteria punctata; outer side view : pt, pterygoid ; qv, quadrate. The fragmentary skull of Ichthyosaurus 1 figured by Hawkins in his 'Book of the Great Sea-Dragons,' pi. 19. fig. 1, also exhibits the lower two thirds of the left columella, and this is interesting as 1 This specimen has been identified with I. intermedins, Conyb., by Sir Richard Owen, and bears his M S . label. |