?«AUriLOinKA. 
2()0 
Owing to the crushed state of nearly all the adult speciinens in 
their soft matrix (Gault Clay), it has been a matter of great diffi- 
culty to identify individuals of this species, which seems, more- 
over, to present several variations in the character of the ribbing. 
It was hopeless, however, to expect better material from such a 
deposit as the Gault, and therefore such decision has been come to 
with regard to the species identified as the facts seem to warrant. 
There are many young individuals in the Collection which 
probably belong to this species, their characters agreeing with those 
of the younger portions of the adult shells mentioned above. At 
first sight it seemed as if some of these young shells might be 
referred to A'. Monfmollini, Pictet and Campiche *, especially as 
they are characterized by having folds which are developed within 
the umbilicus and extend partly across the sides of the shell, but 
without reaching the periphery. The septa in these shells, bow- 
over, are much closer together than they are represented in the 
figures of Aa MontmoUini given by Pictet and Campiche, and there- 
fore it seems clear that they cannot belong to that species. 
It may be mentioned that X. MontmoUini is recorded in the 
English Gault by F. G. Hilton Price‘s and also by Jukes-Brownc '' ; 
but both these authors place a note of interrogation after the name. 
Mr. G. C. Crick concurs with me in the views here put forth 
regarding A^. MontmoUini and A\ Alhensis. 
Unfortunately there are no French specimens in the British 
Museum belonging to either of these species, and this has added 
very much to the difficulty of identifying X. Albensifi. 
It is interesting to observe that Mr. J. F. AVhiteaves has de- 
scribed a species from the 8ucia Islands ^ under the name of Xautilus 
Suciensis, yi'hich he regards as apparently “ more closely allied to 
the Xautihis Alhensis and X. Xecl'ericnius, as described by Pictet 
and Campiche in the ‘Paleontologie Suisse,’ than to any of the 
ribbed Xautili from the Cretaceous rocks of iS^orth America.” ^ 
^ Descrip, des Fossiles du Terrain Cretace des Environs de Saiute-Croix 
(Paleontologie Suisse), ser. ii. pt. i. pp. 140, 147, pi. xviii. ff. 4-6. 
- The Grault, 1S79, p. 76. 
^ “ On the Relations of thn Cambridge Gault and Greensand,” Quart. Journ. 
Geol. Soc. 1875, vol. xxxi. p. 306; also in “Geology of the Neighbourhood of 
Cambridge” (Mem. Geol. Surv. England and Wales), 1881, Penning and 
Jukes-Brovme, Appendix B, p. 151. 
^ A group of small islands lying at the southern extremity of the Strait of 
Georgia (British Columbia), north of Orcas and San Juan Islands, but within 
United States territory. 
•’ Geol. Surv. of Canada, vol. i. pt. ii. (“ On the Fossils of the Cretaceous 
Rocks of Vancouver and adjacent islands in the Strait of Georgia”), 1879, 
pp. 97-99, pi. .xi. ft*. 1, 1 a. 
