G. C. Crick — Pericyclus fasciculatus, M^Coy. 27 



Professor Hull resents the suggestion that a map done fifty years 

 ago naturally requires considerable modification. Yet that must be 

 a truism. To admit it, allows one to offer cordial congratulation on 

 the work accomplished. To deny it, is to claim superhuman in- 

 fallibility, and to receive a rude awakening. For if the Professor 

 had studied modern Jurassic literature he must have seen many 

 cases where the facts show the boundaries on Sheet M incorrect — 

 cases like the one just recorded by Mr. Richardson, that what is 

 mapped as Inferior Oolite at Condicote, near Stow, is Great Oolite.^ 

 Then there are difi"erences in interpretation. Advance in knowledge 

 has shown that boundaries drawn by lithological characters cannot 

 be maintained ; that to a greater extent than was formerly antici- 

 pated, lithic change does not imply sequent deposits ; that clay, 

 sand, and limestone are but regional phases of contemporaneous 

 deposition, not to be indicated, as formerly, by sequent symbols 

 Gb, G4, G5, but to be marked by the same symbol with modi- 

 ficatory additions, say Ag., Ar., 0. for Argillaceous, Arenaceous, 

 Calcai'eous. 



Professor Hull's remark about esprit de corps is regi'ettable. 

 When one meets Officials out of office hours, and especially at 

 the rooms of the Geological Society, one expects to meet, not officials, 

 but scientific men, who would not put the Survey first and scientific 

 accuracy' second, but who desire, above all else, the advancement 

 of science. 



■ IX. — Note on Perigyclus fasoioulatvs, F. M'Coy, sp. 

 By G. C. Crick, F.G.S., of the British Museum (Natural History). 



IN 1844, in his " Synopsis of the Carboniferous Fossils of Ireland," 

 F. M'Coy described and figured the species Goniatitesfasciculatus 

 (p. 13, pi. ii, fig. 8), a Goniatite referable to the genus Pericyclus, 

 Mojsisovics.^ The type-specimen is preserved in the " Griffith 

 Collection" in the Museum of Science and Art, Dublin, and has 

 been re-figured (as Pericyclus fasciculatus) by Dr. A. H. Foord 

 in his " Monograph on the Carboniferous Cephalopoda of Ireland " 

 (pt. iv, 1901, pi. xxxvii, figs. 5a, 6) ; where its locality is given as 

 Millicent, Clane, county of Kildare. 



In the same work M'Coy also describes the species Nautihs 

 (Temnocheilus) furcatus (p. 21, pi. iv, fig. 13). The type-specimen 

 was most probably from Cork, for it was lent to M'Coy by Dr. Haines 

 of that place, and judging from M'Coy's figure it was much distorted 

 and compressed like so many of the fossils from that locality. Its 

 present location is unknown. Dr. Foord states that it is not in the 

 " Griffith Collection " in the Museum of Science and Art, Dublin, in 

 which many of M'Coy's types are contained, but says that "the 

 excellent figure of it in the ' Synopsis ' renders it easy of identification." 

 Although this species has been previously referred to Mojsisovics' 



1 Geol. Mag., Dec. IV, Vol. X, No. 471, September, 1903. 



2 Abhandl. d. k.-k. geol. Reichsanst., Wien, vol. x (1882), p. 141. 



