128 CARBONIFEROUS CEPHALOPODA OF IRELAND. 



by my friend Mr. G. C. Crick ; adding to it the measurements of the large 

 specimen I have figured in this Monograph (Pis. XXXIII, XXXIV). It will be 

 seen that there is very little difference in size between these two specimens. 



In the synonymy of this species given in Part III, p. 126, of this Monograph, 

 I have suggested that Nautilus \_Solenocheilus'\ dorsalis of de Koninck (not of 

 Phillips) may be the var. y of Phillips (' Geol. York.,' 2, pi. xviii, figs. 1, 2), 

 overlooking the fact stated above, that Hyatt ('Geological Survey of Texas,' 1892, 

 p. 460) had renamed de Koninck's species, calling it Soleiwclieihis evolnfns, in 

 allusion to its evolute whorls. 



Dimensions. 



Large specimen from Clane, Large (figured) specimen 



in the British Museum from Clane, in Dublin Museum 

 (No. C. -t626). of Science and Art. 



Diameter of shell . . 240 mm. . 230 mm. 



„ umbilicus (suture to suture) — . 40 „ 



Height of whorl (dorso-ventral) . — . 133 „ 



Thickness at umbilical margin of aper- 

 ture (about) . . .160 mm. . 150 „ 



Localities. — St. Doulagh's, county of Dublin ; Clane, county of Kildare ; Rath- 

 keale, near Limerick; Blackrock and Little Island, near Cork; and Kilcommoch, 

 county of Longford. (The last three localities are cited in Sir Richard Griffith's 

 ' Localities of Irish Carboniferous Fossils,' forming an appendix to M'Coy's 

 ' Synopsis,' issue of 1862.) 



SoLENOCHEiLUS ? HiBEENicus, A. H. Foovd. Plate XXXVI, figs. 1 a, b, 2. 



1836. Nautilus dorsalis (var. /a), J. Phillips. Geology of Yorkshire, pt. 2, 



p. 231. 



1891. SoLENOCHEiLus HIBEENICUS, A. H. Foorcl. Cat. Foss. Ceph. British 



Museum, pt. 2, p. 171, fig. 28. 



1893. — — A. Hyatt. Carbonifei'ous Cephalopods. 



Secoud pajier. Geological 

 Survey of Texas, Fourth 

 Annual Report, 1892, p. 461 . 



Description. — Shell of medium size, so far as the species is known, nautilus- 

 Hke, subglobose, consisting of about one and a half rapidly expanding involute 

 whorlsj the last overlapping the preceding one to the extent of about three- 

 fourths. Umbilicus proportionately small, exposing the inner volution, with a 

 central vacuity of moderate size; the sides steep, with a distinctly angular margin. 



