- 745 — 
912. ACtinoptyCllUfS erosus Gastrac. — Diat. Challenger 
p. 128, t. 7, f. 8. 
Disciformis, in 10 segmenta a tot lineis levibus di visus et dccussatim 
granulatus ; granulis prope marginem et alibi quandoque cessantibus ; area 
centrali rotunda hyalina. 
Diam. 112 /vt ex icone. 
Hab. in Oceano Atlantico meridionali. 
013. A- Raeanus Gastrac. — Diat. Challenger p. 127, t. 7, f. 4. 
Rotundus, granulatus, cellulosus, disseptimentis 6 triangularibus di- 
stinctus ; cellulis (areolis) subquadratis, denticulis majusculis, pluribus, in- 
tramarginalibus, irregulariter distribuas ; umbilico definito, hyalino. 
Diam. 125 [x ex icone. 
Hab. fossilis in deposito S. Monicae in Galifornia. 
914. Aiiterolampra Cîrevîlleî (Wall.) Grev. 
var. exiinia Gastrac. — Diat. Challenger p. 136, t. 5, f. 5. 
Radiis thirteen-severteen while in the latter they are twenty. 
Diam. 175 p.. 
Hab. in Oceano Atlantico. 
915. Aüteromiilialus antarcticus» Gastrac. — Diat. 
Challenger p. 135, t. 16, f. 11. 
Forma rotunda, parva ; dissepimentis cuneatis, ad verticem trun- 
catis; lineis umbilicalibus redis; areis radialibus linearibus et dcnliculo 
terminali in structis. 
Diam. 50 p. ex icone. 
Hab. ad mare Antarcticum. 
916. A. dialleng^erieil^i^ Gastrac. — • Diat. Challenger 
p. 134, t. 5, f. 2. 
Rotundus ; lineis, umbilicalibus tribus rectis a centro dimanantibus, 
bine bipartitis vel tripartitis ; segrnentorum verticibus obtuso-rotundatis ; 
area radii obsoleti fere obliterata. 
Diam. HO [X. ex icone. 
Hab. in mari Glaciali Antarctico. — Ex eodem loco t. 9, f. 2 adest 
illustrata forma monstruosa. 
9t7. A. ovatilü Gastrac. — Diat. Challenger p. 132, t. 5, f. 7. 
EHiptico-rotundatus ; segmentis rotundato-complanatis ; lineis um- 
bilicalibus rectis vel non angulariter curvatis, ab area piriformi dimananti- 
bus ; areis radialibus marginem non attingentibus. 
Dimens. 42 « 34 jx ex icone. 
Hab. in mari Antarctico. 
