1888 - 89 .] Mr John Rattray on the Genus Goscinodiscus. 663 
intervals straight or slightly arcuate, of uniform breadth, their 
outer ends rounded close to the border, sometimes prolonged 
inwards as subdistinct areas on the interradial spaces. — Aster om. 
wallicliianus , Cleve (not Grev.), Bill. k. Sv. Vet.-Akad. Hand-1. 
Stockh., 1873, Bd. i. No. 11, p. 5, fig. 1 ; Cleve and Moller, Diat ., 
Nos. 145, 146. 
Habitat. — Surface of Java Sea (Cleve, Schmidt); Manilla mud 
(Grove !) ; Muntok, East Indian Archipelago (Grove !). 
Asterom. reticulatus. Cleve, Bill. k. Sv. Vet.-Akad. Handl. Stockli., 
1873, Bd. 1, No. 11, p. 5, pi. i. fig. 2. — Diam. # 051 mm. Centro- 
lateral area with sides uniformly concave and inner end rounded, a 
sharp angular bend at outer extremity of one of its sides. Mark- 
ings : rays arcuate, flexuous or sharply bigeniculate at their middle ; 
the compartments reaching about of radius inwards, their inner 
ends transversely truncate, that on one side of subobsolete interval 
convex towards centre ; areolae distinct, 7 in '01 mm.; the intervals 
broad, expanding gradually outwards to their middle, and again 
contracting uniformly towards their outer subacute ends, not 
reaching the border, the subobsolete interval arcuate, concave 
towards that compartment, having the inner end convex. 
Habitat. — Surface of Java Sea (Cleve). 
Asterom. Darwinii. Ehrb., Mon. Ber. Ak., 1844, p. 200, pi. 
(June), fig. 1. — Diam. *0625 to *0875 mm. Centro-lateral area 
short and broad, sometimes subconical, or with sides almost parallel 
and converging suddenly to the centre. Markings : rays sharply 
geniculate about their middle, with short lateral rami proceeding 
from the angles ; the compartments few, 5, reaching from \ to f of 
radius inwards, of unequal length, their inner ends transversely 
truncate, those bordering the subobsolete interval with the inner ends 
more oblique ; the areolae decreasing gradually outwards from 8 to 
12 in *01 mm.; the intervals tapering ontwards, their outer ends 
rounded, reaching close to the border. — Balfs in Pritcli. Inf., p. 837, 
pi. v. fig. 86 ; Sch., Atl, ,, pi. xxxviii. fig. 16 ; A. Rossii , Ehrb., Mon. 
Ber. Ak ., 1844, p. 200, pi. (June), fig. 2; Mikrog ., pi. xxxv. a. 21. 
fig. 4; A. Brookei , Grun. (not Bail.), Sch., Atl., pi. xxxviii. fig. 9; 
Asterolampra Darwinii, Grev., Trans. Micr. Soc. Bond., 1860, p. 
116, pi. iv. figs. 12, 13. 
