270 Messrs. Foord and Crick on new and 



1874. Nautilus terebratus (Thiolliere), Dumortier, frtudes Paleontolo- 

 giques sur lea Depots Jurassiques du Bassin du Bhoiie, pt. iv. (Lias 

 Superieur), p. 42, pi. vi. figs. 1-4. 



Sp. cliar. Sliell inflated, subglobose, a little compressed on 

 the sides, and slightly flattened upon the periphery, more so 

 in the adult than in the young shell. Aperture wider than 

 high. Umbilicus open, exposing the inner whorls, very deep, 

 the sides steep and having an angular border with a thick- 

 ened rim, which is very characteristic. Septa rather distant, 

 being nearly 1 inch apart on the periphery, where the height 

 of the whorl is 2 inches in the specimen 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 j?ig. 4. 

 ridges, crossed by lines of growth, the latter 

 covering the whole of the surface of the test. 

 The accompanying woodcut (fig. 4) exhibits 

 these ornaments drawn natural size, from a 

 specimen in the British Museum Collection. 



Remarks. The name terebratus was attached 

 by Thiolliere to a specimen in the museum at 

 Lyons, and the species was subsequently 

 described by Dumortier (loc. cit.), whose figures 

 and descriptions enabled one of us to recognize 

 it in the Woodwardian 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 

 recorded in Britain for the first time. 



This species has two characters in common with Nautilus 

 Jourdani, Dumortier, viz. an angular umbilicus and longitu- 

 dinal ornaments ; 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 Verpilliere *, where it is not very rare ; but entire speci- 

 mens are uncommon. He adds that it is one of the most 

 characteristic shells of the Upper Lias of France. 



.Horizon. Upper Lias. 



Locality. Near Lincoln. 



* A village in the Department of Isere, about 18 miles north-east of 

 Vienne. 



