KOXGL. SV. VET. AKABEMIENS HANOI. INGAK. BAND. 18. N:(J 5. 23 



Biddulpllia Gray. 



1. Biddulpliid Moronensis (jL. N. Sp. 



Valve in S. V. oval, stout, with two sti-diig transverse nista- and two laruc and 

 stout oval processes. Structure: large, irregularly scattered puncta on the valve and 

 tine dots arranged in irregular lines on the processes. 



Length of the valve (^,12 mm. Breadth 0,07 mm. 

 PI. IV, fig. 56, '""/i- 



Moron deposit in a slide from Mr. J. 1). Moller. 



2. Biddulphia tenlaculifera Cl. N. Sp. 



Valve elevate, covered with tolerably large puncta arranged irregular lines arouud 

 the centre of the valve. No costaj are visible. Processes elongate, club shaped. 

 Diam. of the valve 0,05 mm. 



PI. V, fig. 67, 7x. 

 Keeling Island (Eugenie Exp.). 



3. Biddulphia Gallapagensis Cl. N. Sp. 



S. V. broadly oval, almost orbicular, with two short stout processes. Structure: 

 pearly granules arranged in lines, radiating from the irregularly punctate centre to the 

 margin, about 12 13 in 0,01 mm. 



Longest diameter 0,049 mm., shortest 0,04 mm. 

 PI. VI, fig. 74, '""Vi- 



Gallapagos Islands (Eugenie Exp.). 



This form belongs to the section of B. aurita, which contains a large number of 

 nearly allied forms, as B. Roperiana, B. Edwardii Febiger etc. 



Triceratium Ehb. 



1. Triceriitium {Hydrosera; Terpsinoe?) trifoliatuiii Cl. N. S[). 



Valve plane, with concave sides and three 3-cuspidate angles, separated from the 

 valve by transverse lines (incomplete diaphragms). Surface covered with small puncta 

 arranged in irregular lines. 



Diam. 0,045 mm. Distance between two apices 0,05 0,06 mm. 

 PI. VI, fig. 71, 7i. 



New Zeeland in fresh or slightly brackish water collected by Mr. S. Berggren 

 very rare. 



This curious species is remarkable for its freshwater habit and seems to be most 

 nearly nlatcd to Hydrosera Wnllich from the Ganges, but it is entirely different. 



