SPIRIFERIDtE. 



93 



PI. X, fig. 12, A, B, may, perhaps, obhge us to conclude that Linne had in view a 

 shell simliar to the one subsequently named Delthjris sulcata by Hisinger ; and this is 

 admitted by the last-named author himself, who at p. 119 of his ' Anteckningar ' (vol. v, 

 1831), informs us that the description given by Linne of his Anomia crispa quite agrees 

 with the one given by himself of Delthjris sulcata; but that, as Dalman (it was, indeed, 

 Hisinger himself, who did so before) had adopted a difierent shell under the name of 

 crispa, which had not the larg(ir median rib (?),^ he has been obhged to give to the 

 Linnsean species the new name of sulcata. If we examine the Linnsean figure of Anomia 

 crispa^ though badly drawn, we find that it represents a Spirifera with extended pointed 

 cardinal angles, and three principal ribs in the dorsal valve, as we so commonly find 

 to be the case with Swedish and British specimens of the shell under description ; while 

 the form subsequently referred to, A. crispa (Linn.), by Hisinger, Dalman, and subse- 

 quent authors, has its hinge-line shorter than the width of the shell, and its cardinal 

 angles obtusely rounded. At page 128 of Hanley's 'Ipsa Linnaei Conchylia' (1855), 

 Mr. Sharpe states that he could not "find a specimen in the Linnaean Cabinet to which 

 the whole of the Linnaean description would apply ; but that, since the Swedes 

 (Wahlenberg, Nilsson, Hisinger) have handed down so many of the fossil species of our 



(Plott gives no figure of this Spirifer ; Lister refers to plates of Plott containing similar figures.) 



" Descripfio. Hie lapis modicse magnitudinis est; a latere ad latus fere sesquidigitum explet ; a 

 vertice ad imum ambitum uncialis est. In dorsum modice elatus. 



"Medium dorsum profundior qusedam lacuna recte dividit ; item ad 

 imam illam lacunam ipse margo labri cujusdam instar paulo productior est. 

 Reliquae etiam striae, amplee, et torosse. 



" Ipse vertex ex altera parte paulo angustior et aliquantulum rostratus 

 est ; adeoque inter anomios ponendus est. 



" Juxta cervices quasi humeri acuti eminent, ut in Pectiuitis, si aures 

 iis demptae essent. 



" Insignem crassitudiuem horura lapidum, qua parte testas referunt, 

 satis mirari nequeo ; certe multum supra modum omnium viventium Concharum. At his eadem fere 

 materia, quae reliquis plerisque figuratis corporibus, in iisdem rupibus inventis ut Trochitis, de quibus 

 alibi ('Philosoph. Transact. Diet. d. Oldenburgh,' No. 100, p. 6181), fuse tractavi, sc. e cujusdam fluoris 

 natura. 



" Locus. Ex his innumeros in saxo calcario sublivido plumbiferoque, qnodam oppidulo regionis 

 Craven, Stock dicto, inveni. Ubi omnes, quantum vidi, singulares fuerunt. 



"At ex agro Staffordiensi bifores cinereos habemus ; et ex ipsis submarinis rupibus juxta -S'ccf/-6o;-OM(7/i 

 bifores solidos, pellucidos, et quasi siliceos ipse exemi. 



" Imo unum apud me servo ex silice proprie sic dicto albo et non pellucido, quod experimentum de 

 cbalybe captum abunde testatur. 



"N.B. Reliquis omnibus, exceptis iis, qui juxta Stock invent! sunt, isti humeri angulosi deesse 

 videntur, imo aliquibus et labrum et lacuna baud ita conspicua sunt ; easdem varietates plurimas in 

 crystallis quibuscunque observare licet." 



1 I am at a loss to understand what Hisinger means, by stating that his Delthyris crispa has not 

 the larger median rib ; for it exists in all the Swedish specimens I have seen. 



