CEPHALOPODA. 49 
Aturia (Nautilus) zic-zac, but it is narrower towards the margin, which circumstance . 
gives a triangular form to the aperture. The septa (Tab. VIII, fig. 3) are very concave, 
and present on each side a broad undulation, with a deep sinus-like depression 
caused by a lateral lobe, more developed in this species than in JV. wrbanus, although 
not attaining the size and importance of that which distinguishes V. Parkinsont. 
The dorsal lobes are much recurved and obliquely truncated; the siphuncle is 
moderately large, placed very near to the dorsal margin, and continuous. The strice 
of growth towards the middle are suddenly bent backwards in deep undulations. 
This species, which attained a size of 10 inches in diameter by 4°2 in. across, was 
first obtained by Mr. Wetherell from the tunnel made at Chalk Farm for the Birmingham 
Railroad. It has also been found in the cuttings now in progress between Whetstone 
and Barnet for the Direct Northern Railroad, and it occurs at Sheppy and at Bognor, 
where it is very common. 
No. 12. Nautitus ParKinsonr. F. £. Edwards. Tab. VII. 
Navriiire. Parkinson. 1811. Organic Remains, p. 105, pl. 7, fig. 15. 
LV. testé discoided, apertura elongato-elliptica, parvetibus convexis ; umbilicis (?) ; septis 
exttis concavis, in utroque latere angulariter lobatis, siphone, prope margines dorsales posito 
perforatis ; lobis lateralibus brevibus, subtriangularibus, mucronatis ; lobis dorsalibus latis, 
perparum concavis, ad extremitates attenuatis, reflexis. 
Parkinson, in his work above cited, described the remains of a Nautilus, purchased 
by him at the sale of Dr. Menish’s collection. These remains, which consist of the 
casts of three chambers, afterwards came into the possession of Mr. Sowerby, who 
has placed them at my service. Parkinson was ignorant of the locality whence 
they came; but from their mineralogical character, the matrix being, in fact, the 
substance known as cement-stone, it was supposed that they were found at Harwich. 
Lately the Rev. Thomas Image, of Whipstead, near Bury St. Edmunds, has 
forwarded to me for examination similar remains, unquestionably obtained at 
Harwich, and consisting of the casts of two chambers, rather smaller than those 
in Parkinson’s specimen, and in a matrix precisely similar. The question, therefore, 
as to the locality of Parkinson’s specimen is set at rest. 
These remains are particularly interesting, from the circumstance that in them the 
angularly-lobed septum which characterises Aturia (Nautilus) zic-xac, and in that shell is 
accompanied by a strictly dorsal siphuncle, is associated with one which, although very 
excentric, is still so truly discal, as to prevent the shell being removed from the present 
genus. The form of the septum is a good specific character, but it cannot be relied 
upon as a generic distinction. The Nautilus Parkinsoni, therefore, although in general 
appearance it closely resembles 4¢wria, must, in fact, from the position of the siphuncle 
i 
“4 
