GENUS MX. NAUTILUS. 95 



MiLiOLui. A transverse ovately-i^lobose or eloiigaled inulli- 

 locular sliell, with transverse chambers, involving the 

 axis alternately and in three directions ; tiie aperture 

 small and circular, or oblong- at the base of the last cham- 

 ber (see Park. Organ. Rem, 3. p. 162. t. 11. f. 11 to 

 20). 



Renulixa. a flat, sulcated, kidney-shaped, multilocular shell, 

 Avith linear chambers adapted to tlie curves of the shell, 

 the last being longest ; the axis marginal (see Park. 

 Organ. Rem. 3. p. 163. t. 11. f. 21). 



Gyrogonites. a sphaeroidal hollow shell, composed of linear 

 curved pieces, slightly grooved at the sides, where they 

 are joined ; by the joining of which grooves linear cham- 

 bers appear to be formed, following the direction of the 

 pieces ; at these joinings on the external surface are cari- 

 nated ribs, disposed transversely about the middle, and 

 spirally at each pole of the shell. At one of the poles there 

 is sometimes to be seen a circular aperture, which some- 

 times appears to be closed by a particular valve or oper- 

 culum (see Park, Organ. Rem. 3, p, 164, t. 11. f. 23). 



The three following are from Mr. Parkinson (see Organ. 

 Rem. vol. 3. p. 143). 

 Hamites. a multilocular hook-formed shell, with sinuous 



septa, with no evident siphunculus (see Park. Organ. 



Rem. 3. p. 144, t. 10. f. 1 to 5), 

 ScJPHiTES. A concamerated shell, commencing with spiral 



turns, the last of which, after being elongated, is reflected 



