ELONICHTHYS ORNATUS. 91 



are founded, and must consequently content myself with quoting the words of their 

 describer. 



ELONicnTnTS obliquus, Wellbum. 



Eloniojithys obliquus, Wellbum. Proc. Torks. G-eol. and Polytechnic Soc, vol. 



xv, pt. i, 1903, p. 73. 



" Description. — Length about 15 cm. The head bones are ornamented with well-marked, slightly 

 undulating ridges, which frequently branch ; on the opercular bones they run more or less obliquely 

 across the bones ; in the maxilla the sculpture is very characteristic, viz., the ridges run for some 

 distance parallel with the upper margin of the bone, they then turn downwards and run with frequent 

 branching towards the dentary margin, where they become very numerous, and some being divided 

 transversely there is here an appearance of tuberculation ; on the mandible the ridges run obliquely 

 upwards and forwards to cut the dentary margin at an acute angle. On the bones of the shoulder- 

 girdle the ridges run in a direction more or less parallel to the long axes of the bones. The scales are 

 of moderate size ; those of the flank are higher than broad ; posteriorly they become more oblique and 

 equilateral, whilst towards the dorsal and ventral surfaces they are low and broad. Their ornamenta- 

 tion consists of well-marked ridges which run transversely across the scale from the anterior border, 

 but below a point about the centre of this border they become more and more oblique, the lowermost 

 ones running downwards for some little distance more or less parallel to the anterior border, then 

 turning above the anterior inferior angle they run obliquely across the scale to the posterior border, 

 whilst the lowermost ridges run parallel to the inferior border. The ridges frequently branch, and 

 their number is often increased, in the posterior half of the scale, by intercalations. On some of the 

 flank scales the sculpture is rendered more ornate by finer ridges, which run across the scale parallel 

 to and between the coarser ridges. Further back on the body the sculpture assumes a more oblique 

 direction, the ridges running more or less parallel to a line drawn from the anterior superior angle to 

 the posterior inferior angle. On the lower ventral scales the sculpture is more regular in pattern, the 

 ridges mostly running parallel to the superior and inferior borders ; there is also frequent intercala- 

 tion of shorter ridges on the posterior half of the scale. The posterior margins of the principal flank 

 scales are denticulated. The fins are only represented by scattered rays, which are somewhat distantly 

 articulated, and have a well-marked longitudinal furrow." 



Mr. Wellburn considers that this fish has a great resemblance to E. Aitkeni, Traquair, 

 but differs from that species in the " more oblique and elaborate nature of its scale 

 sculpture," and also in the circumstance that the ridges on the mandible, instead of running 

 tolerably parallel with the upper and lower margins, run "upwards and forwards, cutting 

 the dentary margin at an acute angle." Mr. Wellburn states that the type and many 

 fragmentary specimens are in his collection. They are all from the "D Shales" of the 

 Millstone Grit at Wadsworth Moor, Marsden, Ivy Clough, near Halifax, in Yorkshire, 

 and at Summit and Autley Gate in Lancashire. 



Elonichthys oenatus, Wellburn. 



Elonichtuys oenatus, E. D. Wellburn. Proc. Yorks. Geol. and Polytechnic Soc, 



vol. xv, pt. i, 1903, p. 75. 



"Description. — The head bones are ornamented with fine, well-spaced, slightly vermiculating 



