KONGL. SV. VET. AKADEMIENS HANDLINGAK. BAND. 18. N:0 5. 23 



Biddulphia Gray. 



1. Biddulphia Moronensis Cl. N. Sp. 



Valve in S. V. oval, stout, with two strong transverse costse and two large and 

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

 fine döts arranged in irregular lines on the processes. 



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

 Pl. IV, fig. 56, '»7i- 



Moron deposit in a slide from Mr. J. D. Möller. 



2. Biddulphia tentaculifera Cl. N. Sp. 



Valve elevate, covered with tolei^ably large puncta arranged irregular lines around 

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

 Diam. of the valve 0,05 mm. 



Pl. V, fig. 67, «»%. 

 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 ram. 



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

 Pl. VI, fig. 74, ""%. 



Gallapagos Islands (Eugenie Exp.). 



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

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



Triceratiiim Ehb. 



1. Triceratium {Hydrosera; Terpsinoe?) trifoliatum Ca.. N. Sp. 



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

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

 arranged in irregular lines. 



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

 Pl. VI, fig. 71, <"'7x- 



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

 verv rare. 



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

 nearly related to Hydrosera Wallirh. from the Ganges, but it is entirely different. 



