17 
this appendage in the former genus l)eing partly in advance of, or 
directly opposed to, the anal fin, while in Catopterus it arises opposite 
the hinder portion of the anal, or is completely hehind. Such a 
character may he provisionally regarded as sufficient for generic dis- 
tinction ; and of Dictyopyge, as thus defined, five species are already 
known. These have been obtained from the Trias of Virginia, U.S.A.,* 
and of Tyrone, Ireland,! the Bnnter of the Ehine Valley, ^ the Kenper 
Sandstone of Coburg, Germany, § and the Upper Kenper Sandstone of 
"Warwickshire, England. || 
The most important descriptions of the genus are those of 
Traquair {loc. cit.) and Striiver [loc. cit.) ; and the fossils from the 
Ilawkeshury beds do not add any very definite information concerning 
new structural features, although, as observed above, some appearances 
are suggestive of interesting novel points, to he verified or disproved 
by future discoveries. One fact, however, seems certain, namely, that 
Striiver’s restoration of D. socialis is incorrect in representing the 
mandibular suspensorium as vertical or even inclined forwards, all speci- 
mens that the writer has examined, whether European, American, or 
Australian, exhibiting a suspensorium as much inclined backwards as 
in many specialized Palmoniscida'. 
Dictyopyge symmetrica, sjj. nov. 
PI. IV, Figs. 5, G. 
Obs . — The smallest of the Australian species of Dictyopyge is 
represented by specimens exhibiting hut few' details of structure, and 
the following four examples show^ all the features discernible ; — 
(«) Type-specimen (PI. IV., Eig. 5.) 
{h) Nearly complete fish, wanting the upper half of the caudal 
fin (PI. IV., Eig. 6.) 
(<?) Comj)lete trunk, w^anting paired fins. 
{d) A smaller fish, showfing parts of the fins, especially the 
pectoral. 
* Diciyopyqe macrura, Egorton, loc. cit. Catoptems macru7-us,\^ , C. Eedfleld, Amer. Journ. Sci., 1841, 
Vol. sli, p. 27, and Proc. /.nicr. Assoc. Adv. Sci., 1856, pp. 180-188. 
t D. catopterus, E. H. Traquair, Quart. Journ. Geol. Soc., 1877, Vol. ixxiii, p. 565. Palceoniscus catop- 
iertis, Egerton, itul., 1850, Vol. ri, p. 4. 
J I), rlienana, W. Deecke, Palaeonfograpliica, 1889, Vol. xxxv, p. 107, PI. Ti, fig. 11. 
§ I), socialis, Berger, sp., described by J. Striiver, “Die fossilen Eische aus dein Obern Keupersandstein von 
Coburg.” Zeitsclir. deutsch. Geol. Ges., 1864, Vol. xvi, pp. 322-329, PI. xiii, fig. 2. 
11 D. superstes : Palcponiscus superstes, Egerton, Quart. Journ. Geol. Hoc., 1858, Vol. siv, p. 161, PI. xi. 
