86 "WHITE AVES ON FOSSIL FISHES FROM 



isolated in various positions in the space between the slightly open jaws. A detached 

 left ramns of the lower jaw of a somewhat larger individual shews that there is one 

 large inner tooth, about thirteen millimetres in height, at the anterior termination of the 

 ramus close to the symphysis, and another specimen shews that the posterior termina- 

 tion of the premaxillary region of the right side of the frontal plate was also armed 

 with a large inner tooth. A fragment of a lower jaw, aboiit three and a half inches in 

 length, which apparently represents part of the dentary bone of a large individual of 

 E. Foordi, shews two large inner conical teeth, of unusual size, besides several small 

 ones. These two large teeth are unfortunately brojien, bnt the larger one must have 

 been nearly eighteen millimetres high. Both are strongly grooved in a longitudinal 

 direction, and their lateral margins are thin and sharp. The specimens in the Svirvey 

 collection do not shew, conclusively, whether there were any palatal teeth in Eusthenop- 

 teron or not. 



The Shoulder-G-irdle and Paired Fins.— The mode of attachment of the upper 

 part of the shoulder-girdle to the skull in Euslhenopteron is not clearly exhibited in any of 

 the specimens which the writer has seen, nor have any of the internal constituents of the 

 shoulder-girdle been recognised with much certainty. In specimen No. 2, however, a 

 rather slender and slightly curved bone, which is partially detached from the immedi- 

 ately adjacent clavicle which apparently once overlaid it, may possibly represent its 

 ossified coraco-scapular element. This bone is narrow at what would seem to have been 

 its upper termination, and widens gradually and is moderately expanded below. The 

 only specimen, in which any considerable portion of the membranous external ele- 

 ments of the shonlder-girdle is preserved in nearly their natural position, is No. 4, but 

 in it the outlines and relative position of the sixpraclaviculars, and of the interclavicu- 

 lar of one side can be traced, though not without some difficulty. Immediately above 

 the clavicle, with whose upper margin it is suturally connected, there is a narrowly 

 elongated dermal plate, which is probably one of the supraclaviculars. This plate, 

 which is pointed in front and widens moderately backward, extends oblic|nely upward 

 and forward, beyond the clavicle. The clavicle itself is a rather narrow plate which 

 is elongated in a direction at nearly a right angle to the longitudinal axis of the body. 

 The tipper margin is rather narrowly rounded, and its lower border appears to have been 

 acutely produced in front. Its anterior border, which is partly overlapped by the suboper- 

 culum, is seen to be straight in another specimen (No. 2), and its posterior border appears 

 to have been shallowly concave. In the abdominal region, both clavicles are bent ab- 

 ruptly inward, and those portions of the clavicle which are overlapped by the oporcula 

 and subopercula are ornamented wnth a slightly difierent sculpture to those which are 

 not. In front of the lower margin of each clavicle there is a small plate, which is prob- 

 ably one of the interclaviculars. This plate is much longer than high, its anterior mar- 

 gin is obliquely truncated and acutely pointed below, and its posterior extremity is nar- 

 rowly rounded. The posterior half of its upper margin is overlapped by the antero- 

 inferior margin of the suboperculum, and its lower border is nearly straight in front 

 and curved slightly and couA^exly upward behind. 



The pectorals are preserved only in specimens Nos. 1, 4, and 6, and the ventrals only 

 in Nos. 4 and 5. In each of these specimens the paired fins that are visible have been 



