54 



PEOF. SEELEY ON A SMALL LIZARD EROM THE 



There is no trace preserved of transverse processes, such as may be 

 presumed to have existed. The chevron bones are relatively long and 

 slender and directed backward parallel to each other. The vertebrae 

 rapidly decrease in size, and in the latter half of the tail preserved 

 are small. These hindermost vertebras (that is, after about the 

 thirty-fifth) appear to develop a slight neural spine, which is slender, 

 directed backwards nearly horizontally, and terminates without any 

 decrease in thickness, in a rounded end ; but these spines can only 

 be detected in some eight vertebras. The neural arch appears to be 

 preserved to the end of the series, where the whole lateral measure- 

 ment of the vertebra is less than 2 millims., and its length does not 

 greatly exceed 2 millims. The height from the base of the centrum 

 to the middle of the neural arch at about the eighth caudal is 3| 

 millims., the neural arch forming less than half of this height. The 

 union between the centrums is not well defined. The chevron bones 

 in the first dozen vertebrae appear to be about millims. long. 

 There thus appear in the tail to be differences from Hydrosaurus 

 lesinensis in the relatively small development of the neural spine, 

 which never extends upward as a broad plate in this form, and, 

 when it does exist, is a slender backwardly-directed process. The 

 earlier chevron bones in the present fossil appear to have been rela- 

 tively broader ; and in the absence of any indication of transverse 

 processes, it is impossible to affirm that those processes existed. 



The pelvis is imperfectly seen on both sides. The ilium extends on 

 the right side parallel to the vertebrae (fig. 1, i), but its anterior part 

 is covered by the head of the femur. The part exposed is fully 7 

 millims. long; its outer edge is rounded ; it expands anteriorly a 

 little, but appears to be distinguished by its slender form and parallel 

 sides. On the left side of the specimen, underlying the other femur 

 and articulating with a bone in front, which may well be the arti- 

 cular part of the ilium, is a curved bony element (nearly 8 millims. 

 long, wider than the ilium), which from its position might well be 

 the ischium. The bend in it occurs in its anterior third ; it is com- 

 paratively slender, and only expands a little at its distal end. The 

 slender form of the ilium and its relative length are points of differ- 

 ence from the species with which this has been compared. Both hind 

 limbs are fairly well preserved. The femur of the left side (fig. 1, m) 

 is about 11 millims. long, a good deal constricted in the middle, and 

 flattened and expanded at the distal end, which is concave from side 

 to side ; the anterior margin of the bone is concave in length, while 

 the posterior margin is more straight. The characters of the arti- 

 cular head are not well defined, owing to the way in which the bone 

 is compressed ; but the head appears to have been well rounded, and 

 to have measured about half a centim. from front to back. There 

 are no indications of the distal epiphyses represented by Kornhuber. 



The tibia (fig. 2, t) has its anterior margin straight, and its pos- 

 terior margin concave. It is about 7 millims. long. The proximal 

 end is greatly expanded ; and the shaft is relatively more slender than 

 in Kornhuber's species. The fibula (fig. 2, f ) is a rather more slender 

 bone, without any indication of proximal expansion ; it widens at 



