BIHANG TILL K. SV. AKT. AKAD. HANDL. BANP 1. N:0 11. 5 



4. Eupodiscus Jonesianus Giuovill. (T. M. Soc. n. s. Vol. X 

 ]iag. 2'2. 1'1. Jl ii'^. o) Aerv common. 



Disc verv large, covered by numerous small hexagonal ccl- 

 liiles, those in the centre being gcncrally larger and arrangcd 

 in a står just as in Cos. centralis, but in sonie specimens, espe- 

 cially tlic larger, tliey are wanting and in tlieir place is a blank 

 space. Frocesses, if present, are in all specimens, whicli I have 

 examincd, two and tliese not symmctrical, but in many speci- 

 mens they do not appcar. The margin of the smaller specimens 

 has otten a circle of apiculi, but these are offcen A^^anting. In 

 this character they agree with Coscinodiscus concinnns (Sm) 

 Hoper. When the disc has no apiculi and no processes it can- 

 not be distinguished from Cosc. centralis Ehrb. and I have very 

 little doubt that Eupodiscus Jonesianus as well as Cosc. con- 

 cinnns and Cosc. centralis are forms of the same species. 



The frontview of E. Jonesianus is quadrate with very con- 

 vex ends and broad connecting membrane. 



5. Actinocyclus Ralfsii (Sm.) lialfs (in Pritch. Infus. pag. 

 (S35. Pl. Y fig. 84) not uncommon. 



(5. Actoptychus undulatas Kg. (Sm. Syn. I pag. 25. Pl. V 

 lig. 4o) very rare. 



7. Asterolampra Marylandica Eheb. (^4. impar Shadb. T. M. 

 Soc. Vol. 2. pag. 17. Pl. I (ig. 14) very rare. 



8. Asteromphalus Wallichianus (Gbev.) Kalfs (in Pritch. 

 Jnf. pag. S;i7) very rare. Pl. 1. fig. 1. 



Xot having had any opportunity of seeing a figure of the 

 ■species, 1 am somewhat uncertain about the correctness of the 

 ■determination and for this reason I have given a sketch of the 

 form from Java. Length 0,i)48 m.m. lireadth 0,036 rn.m. 

 The segments are finely punctated and the puncta as in a 

 Pleurosigma arranged in obliquely decussating lines 30 in 0,02 5 

 m.m. 



9. Asteromphalus flabellatus (Bréb.) Grev. (M. J. Vol. \^I1 

 pag. 160. Pl. VII lig. 4 — 5) somewhat rare. 



10. Asteromphalus reticulatus Vl. N. sp.f Eays seven, 

 six of Avhich are very broad; reticulated spaces covered by large, 

 liexagonal cellules (14 in 0,o2 5 m.m.). Umbilical space small 



