290 On new and imperfectly-defined Jurassic Nautili. 



Siplmncle central. The ornaments of the test are described 

 more exactly by Dr. Waagen * as follows : — " The shell 

 itself is covered with two systems of fine striae, of which the 

 parallel ones, which follow the direction of the spiral, are 

 limited to the external part of the shell. The others — striae 



Fig. 18. 



Nautilus ealloviensis. — a, lateral view of a cast, showing the septation and 

 part of the body-chamber ; b, front view. Drawn from a specimen 

 in the British Museum (no. 88979). Nearly two thirds natural size. 



of growth — cover the whole shell, are somewhat falciform on 

 the sides, but bend strongly backward on the external part;. 

 On very large specimens these lines become very strong and 

 numerous, and look as if cut in with a knife ; the other sys- 

 tem of strise then entirely disappears. . . . On the cast the 

 normal line is often very strongly pronounced." 



Remarks. This species is rather near to N. li neat us, but it 

 is distinguished by its more sinuous and approximate septa 

 and narrower umbilicus. 



The differences which separate the present species from N. 

 hexagonus } J. de C. Sowerby, have been pointed out by that 

 author in his description of the Kutch fossils collected by 

 Captain Grant f. He says, a This [JSf. hex agon us?] differs 

 from N. hexagonus in having a smaller umbilicus and in being 

 more rounded." 



Oppel distinguished this species from Sowerby's by its 

 wider aperture ; it may also be known by its deeply-lobed 



* Mem. Geol. Surv. India, Paloeont. Indica, Jurassic Fauna of Kutch, 

 vol. i. p. 18. 



t Trans. Geol. Soc. ser. ii. vol. v. pt. ii. 1S40, Explanation of Plates. 



