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Proceedings of Royal Society of Edinburgh. [sess. 
intervals attenuating rapidly outwards, reaching close to the border. 
— Asterolampra liiltoniana , Grev., Trans. Micr. Soc. Lond., 1860, 
p. 117, pi. iv. fig. 15; H. L. Smith, Diat. Spec. Typ ., No. 49. 
Habitat. — Indian Ocean soundings, 2200 fathoms, Captain 
Pullen (Greville ! Roper !) ; Algoa Bay guano (Greville !) ; South 
Pacific, 2900 fathoms (H. L. Smith !). 
Aster om. Jlabellatus. Grev., Quart. Jour. Micr. Set., 1859, 
p. 160, pi. vii. figs. 4, 5.- — Flabelliform, subtriangular or sub- 
circular. Diam. *0425 to ’06 mm., the minor axis from *0375 to 
*05 mm. Centro-lateral area subclavate, the sides more rarely 
almost parallel towards the central end, inner end rounded. Mark- 
ings : rays straight or slightly curved ; the compartments longer 
towards the subobsolete interval, reaching from f to § of radius 
inwards, their inner ends conical, sometimes transversely truncate ; 
areolae obscure ; the intervals tapering slighty outwards, extending to 
border. — Janisch, Abh. Schl. Ges. cater. Cult., 1861, p. 160 ; Ralfs in 
Pritch. Inf. , p. 837; Sch., Atl ., pi. xxxviii. figs. 10, 12; A. flabellatus, 
var. tergestina , Grun., Yan. Heurck, Syn. Diat. Belg ., pi. cxxvii. 
figs. 5, 6; Asterolampra ftabellata, Grev., Trans. Micr. Soc. Lond., 
I860, p. 116 ; Spatangidium flabellatum, de Breb., Bull. Soc. Linn, 
Normand, 1857, p. 297, pi. iii. fig. 3 ; S. peltatum, de Breb., 
ibid., p. 298, pi. iii. fig. 4. 
Habitat. — Rembang Bay (Deby !); Peruvian guano (de Brebisson, 
Janisch) ; Campeachy Bay, Yokohama and Hong Kong (Schmidt) ; 
California guano (Greville !) ; Corsican algae (de Brebisson) ; 
Teignmouth Ascidia (Grove !). 
Asterom. cleveanus , Grun. Sch., Atl., pi. xxxviii. figs. 13, 14. — 
Roundly elliptical to oval. Major axis - 045 to ’075 mm.; minor 
*04 to B625 mm. Centro-lateral area tapering towards outer ends, 
the inner end angular, sometimes with sides slightly concave 
outwards. Markings : rays springing from apex and sides of 
centro-lateral area, straight or concave towards subobsolete ray, 
sometimes dichotomous ; the compartments longest towards ex- 
tremities of major axis, shortest towards the minor, reaching from 
J to § of radius inwards ; their inner ends rounded or somewhat 
obliquely truncate; areolae delicate, 12 to 14 in *01 mm., the 
