inHANO TIT,1j k. sv. VET.-AKAT). IIANDL. BANP 1. N:0 9. .) 



of shale (2. b., 2. c); a group of thoracic vertebra- with ribs 

 in another slab (2. a.); and many impressions of vertebral 

 centra in pieces of rock from which the bonv tissne lias 

 partially or wholly disappeared. 



The thoracic centra conform perfectly to the Ichthyosaurian 

 type. Two in the middle of slab (2. a.) show respectively the 

 front and back articular surfaces which are unequally laollow 

 as in many known species. On one centrnm the npper 

 tubercle, that which reccives the tubercuhim cost;r, is im- 

 iTiediately below tlie neurapophysial scar, seemingly conflueut 

 with it; and lower on the side of the centrum, at an interval 

 of rather more tlian 0,2 inch, and nearer the anterior börder 

 of the centrum, is the capituhir costal tubercle. The interval 

 between these two tubercles (upper and lower transwerse 

 process) exactly equals the distance between the capitulum 

 and tuberculum of a near lying rib. 



The contour of these centra is subcircular, slightly angu- 

 hited, with an approach to a six-sided figure. The greatest, 

 horizontal, transverse diameter, in the level of the lower costal 

 tubercle, ncarlv equals the vertical diameter which in the 

 more perfect centrum is about 1,6 5 inch. The antero-poste- 

 rior diameter is about 0,3 5 inch. Close to the less perfect 

 centrum (at a spöt marked (x)) is a small, flat, four-sided 

 ossicle unmistakably identical with a group of small, tabular, 

 polygonal ossicles, plainly part of an Ichthyosaurian paddle, 

 now adhering to the left side of the 1st- and 2nd centra in a 

 series of very peculiar caudal vertebrse marked (2. d.). These 

 caudals (2. d.), although slightly distorted, still retain their 

 original shape sufficiently to show that their vertical diameter 

 has relativelv to the horizontal-transverse one greater than in 

 any known Ichthyosaurus. Their articular surfaces are also 

 Hatter. A single, circular tubercle on the outer, or non- 

 articular surface, near the anterior börder of the centrum 

 gives them an earlier place in the spinal column than that 

 held by the next series (2. e.). from which the costal tubercle 

 is absent. 



This series (2. e.) is hardly at all distorted. The outline 

 of the centra is a narrow oblong, the major diameter vertical. 

 Tlie articular surfaces ar(^ very Hat, aiul they have slightly 

 below their middle a small but deep pit. Their margin is 

 slightlv swallen which renders the non-articuhir surface gently 



