72 KEPOiiT— 1867. 



D. pridinifornm, Hall; D. mitcrmiahis, Hall, D. antennarius, Hall, and D, tere- 

 tiuscuhs, His. 



Of the genus Didj/moffrapstts, M'Cor, seven species are found, viz. 2). nitidus, 

 Hall, D. patiihis, Hall (=Z>. kirnndo, Salter), D. serrafrthts, Hall, D. hifidus, Hall, 

 D. sextans, Hall, i). gemimis, His., and D. V.-fractus, Salter. 



Of the peculiar genus Phjllograpsus, HaU, two species had been recognized, viz. 

 P. anffiisttfoliiis, Hall, and P. Ujpiis, Hall. 



Of the genus Grapfolites, Linn., four species had been stated to occur by Mr, 

 Salter, viz. G. saffitfarius, Linn., G. tenuis, Port!, G. Nilssoni, Ban-., and 6^. latus, 

 M'Coj'; but these determinations had been in all probability founded upon frag- 

 ments of the compound forms. 



On the Geology of India. By Dr. Oldham. 



On Fossil FisJies of the Old Red Sandstone of Caithness and Sutherland, with 

 notices of some new to those Counties. By C. W. Peach. 



The author first mentioned Pterichthys as being abundant in Orkney, but until 

 186.3 not a vestige of it had been found in Caithness or Sutherland, when in June 

 of that year he was fortunate enough to turn up, in the thin flaggy beds inter- 

 calated amongst the coaa-se sandstones near John O'Groat's, an exceedingly small 

 species, with smaU spined arms, delicately but beautifully sculptured. One 

 specimen had two horn-like appendages, which turn right and left at right angles, 

 and, like the others, differs from those found in Orkney, and, if a new species, the 

 author intends to name it after his late valued friend Robert Dick, so that at least 

 one thing belonging to the Old Pied Sandstone, for which he did so much, might 

 bear his worthy name. After a full description of the above, he mentioned Coc- 

 costeits, describing C. pusilhis of M'Coy, of which he had got nearly a perfect 

 specimen at !Murkle, near Castlehill. In one he pointed out that the tail was 

 covered either with scales or a tuberculated skin, a fact not before observed. 

 Coccosteus trif/onaspis of M'Coy he considered not a good species, it being made 

 from the lozenge-shaped ventral plate of the above species. M'Coy himself was 

 doubtful about it. 



From A^'ick Head he had obtained Osteolepis hrevis of M'Co}'. Dipterus he 

 found was a true bony fish, as might be seen by the specimens produced, showing 

 vertebral coluum, ribs, processes, and interspinous bones. Of Acanthodes he had 

 obtained a third species, the Acanthodes pusilliis of Agassiz. 



HoluptycluHs Scdf/icickii he felt sure was also a true bony fish, as seen by the 

 specimen he exhibited, showing similar internal bones to those noticed as occurring 

 in Dipterus. All the above fishes were found in Caithness, and as well, probably, a 

 new Chciracanthus and spines of Diplacanthus lonyispinus. At Dornoch, in Sutlier- 

 landshire, he had foimd scales of Ilolopti/chius in the sandstones near the sea. 



Tristichtipterus alatus was next alluded to. This really handsome fish was 

 described by Sir Philip Egerton in Decade X. of the Geological Survey, from im- 

 perfect specimens exhibited by the author at the Briti.sh Association at Aberdeen, 

 in ]859; and although described as a true bony fish, its true place could not be 

 positively made out, from the absence of paired fins, bones of the head, teeth, &c. 

 Specimens of aU these were produced, and fulh' bore out the conclusion which Sir 

 Philip Egerton had arrived at when de.scribiiig the one got in 1859. After men- 

 tioning the probability of his having found (as well as the above) Annelides in 

 Caithness rocks, he stated that he fully agi-eed with Sir R. I. Murchison, in his 

 triple arrangement of the Old Red Sandstone in the counties of Caithness and 

 Sutherland. 



On the Geoloc/y and Fossils of the Lingida Flags at Upj^er Maivddach, North 



Wales. Bif Jonx Plant. 



Mr, R. Slijion's coUectJon of Crustacea was exhibited. 



