XATJTILID^. 
and distorted condition, some of them being squeezed into less than 
half their natural thickness ; this has contributed not a little to the 
difficulty which has been experienced in identifying the species. It 
is rarely that one finds a specimen with the symmetry of its form 
perfectly preserved ; such is the case, however, with the specimen 
numbered C. 37 in the Collection, which is quite uncompressed, and 
shows the characters of the species admirably — sutures, siphuucle, 
&c. In no case is the outer layer of the test preserved, though the 
ornaments are very well displayed on most specimens. 
SautiJns elegans is nearly allied to 7\7 pseudoelegans^ from which it 
is, however, easily distinguishe 1 by its much more compressed form 
and the finer character of the ribbing. From N. Af.las it diflPors in 
the first of these characters, and also in the position of its siphuncle. 
The dimensions of the largest specimen in the Collection (jS"o. 
C. 3360) are as follows : — Greatest diameter about 1 foot ; greatest 
breadth about 6^ inches. 
The locality of this fine specimen, which is from the Lower Chalk, 
is unfortunately not recorded. A large specimen (cast) from the 
Upper Greensand of Yentnor, Isle of AVight, doubtless belongs to the 
present species, though the umbilicus is somewhat smaller than 
usual. 
Horizon. Upper Greensand. Lower Chalk. 
Localities. British. Folkestone, Kent ; Eingmer (type specimen), 
Lewes, Sussex ; AYmtnor, Isle of AVight (Lower Chalk) : Sussex ; 
Cliffe Anstey, AViltshire ; Isle of AN^ight (Chalk Alarl). There are 
also several large English specimens which are not localized. 
AA’ell represented in the Collection, which contains numerous 
very fine specimens, including Sowerby's tj’pe of the species (J^fo. 5671) 
figured in the ‘Mineral Conchology.’ 
Nautilus elegantoid.es, d’Orbigny. 
1840. Xanfilus eleganfoides, d’Orbigny, Paleontologie Fraucaise, Ter- 
rains Cretaces, vol. i. p. 89. 
/Sp. CJun'. This species is briefly described by d’Orbigny (loc. cit.) 
in the following paragraph : — “ II parait done constant, d’apres les 
observations des geologues et d’apres mes observations personelles, 
que le Xautilus elegans est special aux couches des craies tufau ; 
car, tons les f ragmens que j’ai recueillis dans le gres vert de la 
Normandie (Apaches noires), me portent a croire qu’il y existe 
encore une autre espece voisine de V elegans, mais bien plus etroite, 
et a siphon plus median, que j’ai nominee AT? elegantoides, mais 
je ne la possMe pas assez complete pour la caracteriser nettement.” 
