256 Mr. T. Stock on Ctenoptycliius pectlnatus, Ag. 



nevertheless it appears to me that the view of the labyrintho- 

 dont origin of these bodies is more conformable with the facts 

 of their structm'c (as I have endeavoured to describe and in- 

 terpret tliem) than with any other " theory" tliat can at pre- 

 sent be offered. Wliatever may be their ultimate fate, the 

 reference to Ctenoj^tyclnus may safely be disregarded. Prof. 

 Fritsch has certainly contributed an interesting puzzle to 

 science, the solution of wliich will no doubt be found as tlie 

 rocks are made to yield up their fossil contents. 



I regret that my specimens from Loanhead are not well 

 suited for microscopical ])reparation. 



]\lr. John Ward, F.G.S., tells me that Kammplatten are 

 found in the Staffordsliire coal-field. 



Mr. T. P. Barkas corrects* Ctenoptijcliius marginnlis^ 

 Barkas, to C. marginalis^ Ag. There appears to be a little 

 doubt as to the authorship of this species, if species it is. It 

 seems to liave been first recorded in Portlock's Geol. lleport 

 on Londonderry &c., once at p. 401, from a list of fossils sup- 

 plied by Capt. Jones, ]\I.P., and again at p. 769; but, curiously 

 enough, the authority is not appended in either case. It is 

 omitted too from an interesting account of the genus recently 

 published t by Mr. J. W. Davis, F.G.S. 



Note on Ctenoptychius pectinatus, Ag. 



[Plate VIII. figs. 5-17.] 



1'he fossils known as Cienojjfyclnus jyectinatus^ Ag., are pretty 

 generally distributed throughout the Carboniferous Limestone 

 and Calcifcrous Sandstone series of JMidlothian. Si)ccimens 

 liave been collected by the Scottish Geological Survey at 

 Juniper Green, and from beneath St. Anthony's Chapel, in 

 the Queen's Park, Edinburgh. They appear to occur 

 sparingly (at any rate, few sjjccimens have been collected) 

 below the limestone of Burdiehouse, from which the type 

 specimens came ; but above that horizon they increase in 

 irequency, reaching their greatest abundance in the strata 

 worked for coal and ironstone along the line of country be- 

 tween the Venturefair colliery at Gilmerton and the pits at 

 Glencorse. From these workings, and especially from Gil- 

 merton and Loanheadj I have obtained, ])artly through the 

 intervention of my friend Mr. W. T. Kinnear, a large number 

 of specimens, which I could easily have increased if it had 

 been worth while. An examination of this abundant mate- 

 rial shows that, as Messrs. Hancock and Atthey long since 



* " Cfenopfychim or Kammplatten/ 'Aunals/ Nov, 1881, p. 300. 

 t 'Annals,' Dec. 1881, p. 424. 



