^’AUTILIDJE. 
205 
measured. Sutures very slightly bent upon the sides' *of . the 
shell and forming a very shallow sinus upon the 
periphery. Siphuncle nearly central. Test rather 
thin, ornamented on the periphery with fine, close- 
set, longitudinal ridges, crossed by lines of growth, 
the latter covering the whole of the surface of the 
test. The accompanying woodcut (fig. 37) exhibits 
these ornaments drawn natural size, from a speci- 
men in the British Museum Collection. 
Remarl's. “ The name Urehratusv^^?> attached by 
Thiolliere to a specimen in the museum at Lyons, 
and the species was subsequently described by 
Dumortier {Joe. cit.), whose figures and descriptions enabled one of 
us to recognize it in the AVoodwardian Museum, Cambridge, where 
it is well represented. The authorities of that Museum having 
kindly presented a specimen to the British Museum, we are enabled 
to give figures of this well characterized species, which is now re- 
corded in Britain for the first time. 
“ This species has two characters in common with Nautilus Jour- 
dani, Dumortier, viz. an angular umbilicus and longitudinal orna- 
ments ; but the latter are confined to the peripheral region, and the 
umbilicus has a very characteristic rim. 
“M. Dumortier states that he only knows this species from La 
Yerpilliere \ where it is not very rare ; but entire specimens are 
uncommon. He adds that it is one of the most characteristic shells 
of the Upper Lias of Trance.” {Foord and G. C. CrieJe.) 
Horizon. Upper Lias. 
Locality. Xear Lincoln. 
Bepresented in the Collection by a single example. 
Nautilus robustus, Foord and G. C. Crick. 
1890. Nautilus robustus, Foord and G. C. Crick, Ann. & Mag. Nat. 
Hist., ser. G, vol. v. p. 271, f. 5. 
Sp. Char. “ Shell of robust habit, slightly compressed on the 
sides and flattened on the periphery, especially towards the aperture ; 
the angles formed by the junction of the sides and periphery 
rounded. Umbilicus open and exposing almost all the inner 
whorls ; its sides rounded and rather steeply sloping. Aperture 
wider than high. Septa 1 inch distant from each other in the 
^ A village in the Department of [sere, about 18 miles north-east of Vienne. 
