Notices of Memoirs — Kner — On Conchopoma. 29 



All the stones containod fine air pores, pear-shaped or worm -like, 

 running from the centre to the circumference. The drawings are as 

 near as possible natural size. 



II. — Description of CoNcnopoMA oadifoume, a new Genus from 

 THE Permian of Lebach, Etc. 



By Professor Kner, of Vienna. Abstracted by Dr. Cna. Lutken. 



[Kner : Ueber Conchopoma gadiforme, n.g., und Acanthodes aus dem Kothliegenden 

 (der untern Dyas) von Lebach bei Saarbriicken in Itheinpreussen. Wiener 

 Sitzungsbcrichte. Ivii. bd. 1868.] 



THE length of the head was in the smaller specimens about one- 

 fourth of their total length, but in the larger hardly one-fifth ; 

 it was at least as broad as high, or even broader ; the mouth was 

 terminal. Both jaws were armed, in the middle, with a single series 

 (rarely several) of pointed teeth ; the vomer and palate were paved 

 with a series of larger, thicker, partly globular, partly obtusely- 

 pointed, crushing teeth ; a similar series of teeth was directly opposed 

 to it below, probably placed on the hyoid bone ; the palatine bones 

 had also, apparently, a narrow longitudinal band of similar teeth. 

 The upper part of the head was covered by thin plates radially 

 furrowed. The eye, apparently small, was situated laterally, near 

 the anterior end of the snout. The branchial fissure was covered by 

 (probably two) conchiform opercular bones, one (by far the larger), 

 the principal opercular bone, has its umbo directed upwards ; the 

 other and smaller one appears to have its umbo pointed downwards. 

 The scapular arch was formed of a broad strong humerus, to which 

 were attached the broad clavicular plates, uniting on the throat in 

 such a manner as to form an angle with each other, as is the case in 

 many Siluridce and Loricarince. The branchial arches were broad, 

 channel-shaped bones ; the branchiostegous rays rather short and 

 thin. The anterior part of the trunk was higher than the head, and 

 the general outline reminded one, especially by the high and lono- 

 peripherical (dorsal) fin, of the PleuronectidcB. The dorsal fin, how- 

 ever, commenced beyond the middle of the total length, and extended 

 backwards, lowering rapidly towards the tail point, immediately 

 opposite the similarly constructed anal fin, near to which the rather 

 small, few-rayed ventrals were affixed. The numerous slender 

 articulated rays of the dorsal fin were supported by long, slender, 

 hollow interspinous bones, reposing on similar spinous processes. 

 The pectorals were attached behind the " shoulder-girdle," or 

 scapular arch, about mid- way between the dorsal and ventral line, 

 and were longer than broad, and many-rayed. 



In the vertebral column the osseous centra were altogether want- 

 ing, and the notochord extended in a broad and rectilinear course to 

 the very point of the tail ; superior and inferior narrow arches were 

 only partially developed, and the spinous processes were remarkably 

 long and slender, as in CoelacantM, forming hollow tubes, as do also 

 the numerous ribs. 

 ^ The whole trunk was covered to the very edge of the fins by small 



