128 CARBONIFEROUS CEPHALOPODA OF IRELAND. 



bv my friend ^^Ir. 0- C. Crick ; adding to it the measurements of the large 

 specimen I have figured in this Monograph (Pis. NXXIII, XXXIV). It .vill be 

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



In the sjTionymy of this species given in Part III, p. 12G, of this Monograph, 

 I have suggested that Nautilus [Sohnocheilus] 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 Konmck's species, calling it Solenocheilns evohdus, m 



allusion to its evolute whorls. 



Dimensions. 



Lar-re specimen from Clane, Large (figured) specimen 



in the Britisli Museum from Clane, in Dublin Museum 

 (No. C. 4626). of Science and Art. 



Diameter of shell • • 240 mm. . 2:30 mm. 



umbihcus (suture to suture) — • 40 „ 



Height of whorl (dor.so-ventral) . — • 133 „ 



Thickness at umbilical margin of aper- 

 ture (about) . . • KjOmm. . LjO „ 

 Localities.— ^t. Doulagh's, county of Dublin ; Clane, coimty 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 tb M'Coy's 

 ' Synopsis,' issue of 1862.) 



SoLEXOCHEiLUS ? HiBERNTCus, A. H. Foovd. Plate XXXVI, figs. 1 a, b, 2. 



1836 Nautilus doksalis (var. 3), J- P^n^ips. Geology of Yorkshire, pt. 2. 



p. 231. 



1891 SoLENOCHEiLUS HIBEENICU8, ^. H. FoorcZ. Cat. Foss. Cepli. BritiBh 



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



jggg _ _ ^. Hyait. Carboniferous Cephalopods. 



Second paper. Geological 

 Survey of Texas, Fotirth 

 Annual Report, 1892, p. 461. 



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

 like, subglobose, consisting of about one and a half rapidly expanding mvolute 

 whorls, 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 margm. 



