G. C. Crick — On Goniatites, Nautilus, etc. 415 



the other two specimens, viz. the original of pi. xvii, fig. 24, which 

 is in the Gilbertson collection in the British Museum (No. C. 222) ; 

 but Phillips' description seems to have been based chiefly upon the 

 specimen represented in pi. xvii, figs. 33. 34, for fig. 33 represents 

 the " back slightly concave, with a small spiral ridge within the 

 angles," and in fig. 34 are depicted the " bent, sharp striae, rising 

 into plaits on the edges." Both these characters are to be seen in 

 well-preserved specimens of Ccelonautihis quadratus (Fleming) 1 ; and 

 further, the section indicated in fig. 33, as well as the form of the 

 septa given in fig. 34, agree so well with these characters in 

 Fleming's species, that in all probability the fossil here figured is 

 referable to this species ; but a definite opinion cannot be given 

 without an examination of the specimen. These characters, how- 

 ever, are not present in the specimen figured by Phillips, pi. xvii, 

 fig. 24, which has the test well preserved : the transverse striae are 

 not nearly so much bent on the lateral area as in Ccelonautihis 

 quadratus, and further, over about half of the width of the lateral 

 area, and for more than one-half of the length of the fragment 

 figured, the trausverse striae are thickened at regular intervals, so 

 that they have the appearance of being crossed by spiral lines. 

 The sculpture, in fact, is that of Phillips' " Goniatites " evolutus, 

 as exhibited by the specimen to be referred to later on. The peri- 

 pheral lobe of the sutui'e-line also agrees with that of the same 

 species. 



Again, the periphery in Ccelonautihis quadratus bears a strong 

 ridge at about one-quarter of the width of the peripheral area ft-om 

 each angular margin, and in well-preserved specimens there is 

 sometimes a much more feeble ridge about half-way between each 

 of these strong ridges and the angular margin ; the transverse striae 

 are also very feeble. But in the specimen depicted by Phillips as 

 Nautilus tetragonus in pi. xvii, fig. 24 (probably Phillips' var. /3), 

 the periphery bears near each margin about six longitudinal lines, 

 which diminish in strength from the angular margin inwaixls ; and 

 the transverse striae are much more pronounced, an ornamentation 

 agreeing with that of Phillips' " Goniatites " evolutus, as exhibited 

 by the specimen described below. 



We conclude, then, that Phillips' Nautilus tetragonus is in part, 

 and only in part, referable to that author's " Goniatites " evolutus. 



Upon this latter species, as has already been stated, D'Orbigny in 

 1850 founded the genus Subclymenia ; still, several subsequent writers 2 

 have regarded the species as a Goniatite. Although not a Goniatite, 

 but a Nautiloid, the genus (Subclymenia) to which it is referred is 



not agree with the specimen figured by Phillips in pi. xvii, fig. 24. The figure differs 

 in some respects from the specimen. The periphero- lateral angles should have 

 heen represented more obtuse, and the suture-line with a narrower and shallower 

 sinus on the periphery. 



1 Nautilus quadratus, J. Fleming, "Hist. Brit. Anim.," 1828, p. 231. 



2 J. Morris, " Cat. Brit. Foss.," 2nd ed., 1854, p. 303 ; G. Sharman and E. T. 

 Newton, " Geol. N. Derbvshire," 2nd ed., 1887, Appendix 1, p. 182: Mem. Geol. 

 Surv. ; R. Etheridge, "Brit. Foss.," vol. i, Paheozoic, 1888, p. 311; G. H. 

 Morton, Proc. Liverpool Nat. Field Club for 1894, p. 23, 1895. 



