546 
Proceedings of Royal Society of Edinburgh. 
(Grunow ! Rattray !) ; Java Sea (Grunow ! Cleve and Moller !) ; lat. 
4° 12' 7" H., long. 3° 57' 5" E, 1460 fms. (Rae !) ; Isle of Muntok, In- 
dian Archipelago (Kitton !) ; * Hancoori (Cleve and Moller !) ; Java 
(Cleve and Moller! Cleve!); lat. 4° 20' S., long. 105° 22' E. (Cleve!); 
surface, Gulf of Guinea, S.S. Buccaneer Exped. (Grove !). 
0. Gazellce. Janisch., Jour. Roy. Micr. Soc., Lond ., 1879, p. 
688. — Diam. 1*8 to 1*9 mm. Central space circular, about -0375 
mm. broad, hyaline, bearing at its centre a group of irregular 
evident apiculi, and having at its boundary a circlet of similar 
apiculi at wide unequal intervals. Markings delicate, punctiform, 
6 to 7 in *01 mm.; rows straight, short secondary transverse or 
oblique rows obvious ; adjacent to the border a distinct narrow 
(about '003 mm. broad) hyaline zone.t Border sharply defined, 
about -005 mm. broad, hyaline. — Ethmodiscus tympanum , Cstr., 
Diat. Chall. Exped ., 1886, p. 170, pi. xiv. fig. 3; E., sp. {frag- 
menta ) Cstr., ibid., p. 170, pi. xiv. figs. 4 a-c\ E. gigas , Cstr., ibid., 
p. 169, pi xiv. fig. 5. 
E. ivyvilleanus , Cstr. {ibid., p. 170, pi. xiv. fig. 6), differs only 
in having the angles of the valves rounded, and may be a var. of 
the present species. To the same var. belongs E. sphoeroidalis, 
Cstr., ibid., p. 170, pi. xxii. fig. 10; in the specimen figured divi- 
sion has recently been completed. 
Habitat — Gazelle sounding Ho. 125, lat. 30° 53' S., long. 177° 
6' E., depth 4151 metres (Janisch!); and sounding Ho. 96, lat. 
9° 57' S., long. 121° 52' E. (Weissflog!); H.M.S. Challenger, 
station 265, depth 2900 fms. (Grunow !) ; Hottingham deposit in 
fragment (Grunow). 
C. imperator, Janisch MS. — Diam. ? Central space and rosette 1 
Markings minute, delicate, angular, 8, towards the border recog- 
nised with greater difficulty, 10 to 12 in *01 mm.; rows straight ; 
the oblique decussating rows faint ; hyaline band adjacent to the 
border absent. Border narrow, hyaline. — (PI. I. fig. 5.) 
Habitat. — Gazelle Expedition, sounding Ho. 96, lat. 9° 57' S., 
long. 121° 52' E. (Weissflog!). 
G. praetor, Grove MS. — Diam. 1 ? Surface flat. Central space 
+ This also occurs in C. rex. 
In the collection of E. Grove. 
