NAUTILIDJE. 
175 
Localities. British. Castleton, Derbyshire. — Foreign. Vise, Bel- 
gium. 
Kepresented by a fine series of specimens from Belgium, and two 
of the specimens figured by Phillips in the ‘ Geology of Yorkshire,’ 
contained in the “ Gilbertson Collection.” 
Solenocheilus conspicuus, de Koninck, sp. 
1878. Nautilus conspicuus, de Koniuck, Paime du Calcaire Carbonifere 
de la Belgique (Amiales du Mus. Boy. d'Hist. Nat. de Belgique, 
tom. ii.), p. 109, pi. xix. fi. 1 1 6, 1 c, pi. xx., pi. xxi. ft. 1 1 b. 
Soloiocheiliis consy'mms. — a, lateral view, showing tlie hody-ch amber with its 
contracted aperture, and the septate part of the shell from the commence- 
ment ; h, front view. Drawn from a specimen in the Collection. About 
one third natural size. 
Char. Shell thick, discoid, tumid ; composed of about two 
rapidly increasing whorls, which are all exposed in a small, deep 
umbilicus, having a small central perforation. The body-chamber 
occupies about one half of the last whorl, and is a little prolonged 
beyond the coiled portion ; it is inflated at about its mid-length, 
and becomes very considerably contracted at the aperture, the 
dorsal side of which presents a characteristic projecting rim. The 
septa are wide apart, there being only sixteen or seventeen in a 
complete whorl ending at the base of the body-chamber. The 
siphuncle is situated close to the ventral margin, just beneath the 
