276 



Messrs. Foovd and Crick on new and 



in their margins. The siphunculus is near the middle oi 

 each septa" [septum] (Sowerby). 



Remarks. The unsatisfactory character of Sowerby's 

 description and figures of this species has given rise to much 



Fur. 8. 



Nautilus lineatus. — a, lateral view, showing the closed umbilicus, and 

 parts of the septa where the test is broken away ; b, front view, 

 showing the position of the siphnncle and the compressed form of 

 the shell. Drawn from a specimen in the British Museum (no. 

 43854 a), " Sowerby Collection." A little less than one half natural 

 size. 



confusion regarding its identity, and more than one species 

 has doubtless been included under the name lineatus. 



Though neither of the figured types of lineatus are contained 

 in the British-Museum Collections, yet there is a specimen 

 (one of those (a cast) numbered 43854) labelled in Sowerby's 

 handwriting "Nautilus lineatus, M. C. 41," which agrees in 

 all respects with his figures in the l Mineral Conchology ' 

 (vol. i. pi. xli.). He, however, describes the species as 

 " umbilicate/' a statement which is not borne out by his 

 figures ; and we think it highly probable that Sowerby's 

 figured specimens (which are both casts) had a closed umbilicus, 

 because if the shell were present it would entirely fill up the 

 cavity seen in the cast. Another specimen (cut and polished 

 and also numbered 43854) is also labelled by Sowerby "Nau- 

 tilus lineatus, M. C," but it differs from his figured types in 

 more than one particular, viz. in its more flexuous and less 



