524 
Proceedings of Royal Society of Edinburgh. [sess. 
Habitat. — Newcastle deposit, Barbados (Bae! Weissflog! Febiger!* 
Grunow) ; trawled by H.M.S. Challenger, in 2900 fathoms, lat. 
12° 42' N., long. 152° V W.; “Barbados” (Firth! Febiger !). 
Yar. biocellata. Gran, ibid ., 1884, p. 73. — Diam. *0875 to 
•15 mm. Surface elevation and depression opposite, roundly 
elliptical, edges abrupt. Markings on the elevation 6 towards its 
central edge, 3 towards the peripheral, in ’01 mm., in radial, 
diverging rows ; on the depression more equal and larger, 2 \ in 
*01 mm., elsewhere as in var. quadriocellata. — C. diophthalmus , 
var. monophthalma , Cstr., Diat. Chad. Exped ., p. 163, pi. xvi. 
fig. 7. 
Habitat. — Newcastle deposit, Barbados (Bae! Kitton ! Weiss- 
flog ! Firth ! Febiger !) ; * Cambridge deposit, Barbados (Bae !) ; 
Hardman!)! “Barbados” (Febiger!); trawled by H.M.S. 
Challenger, in 2900 fathoms, lat. 12° 42' N., long. 152° 1' W. 
(Bae !). 
Yar. semilunaris. Grun., ibid., 1884, p. 73. — Diam. *1 to 
•1175 mm. Surface elevation semilunate, with rounded ends, 
sometimes short and broad, uniformly disposed with respect to the 
centre round which it curves, the depression slight, half inclosed 
by the elevation. Central rosette inconspicuous. Markings 
towards the centre 4, towards the border 3 in *01 mm. — C. semi- 
lunaris, Grun., ibid, 1884, p. 71. 
The vars. quadriocellata, biocellata, and semilunaris approach G. 
crassus , Bail., in the character of the markings ; those of var. genuina 
recall C. gigas, Ehrb. 
Habitat. — Newcastle deposit, Barbados, (Weissflog ! Grove !). 
Yar. deliquescens, nov. — Diam. ’0475 mm. Surface elevation and 
depression opposite, the former indistinct, the latter evident, but 
elliptical. Markings on the depression round free granules, with 
hyaline interspaces, elsewhere angular, 4J in , 01 mm.; towards the 
border smaller, rounded ; between the outer ends of the radial rows 
* In the collection of Herr E. Weissflog. 
t In the collection of Julien Deby. 
