EEPORT ON THE RADIOLARIA. 591 



former. Arms club-shaped, their basal semi-cylindrical, half as broad as the spherical distal half, 

 which bears a strong, conical, terminal spine. The discoverer of this remarkable, very old, Liassic 

 species, Dunikowski, supposes that it is not a true Discoid, from the absence of a central disk ; in 

 my opinion the central disk (nearly spherical) has the same relation to the arms as in many other 

 Discoidea, their equatorial plane is the same. 



Dimensions. Radius of the odd arm 018, of the paired arms 0'24 ; bajsal breadth 0'08, distal 

 breadth 016. 



Habitat. Fossil in the Alpine Lias, Schafberg, near Salzburg, Dunikowski. 



6. Rhopalodictyum elongatum, n. sp. 



Arms of different size and at unequal distances, one odd arm being twice as long as both paired 

 arms ; the odd angle between the latter much larger than both equal paired angles. Arms nearly 

 cylindrical, little flattened, three to six times as long as broad, with rounded blunt distal end. 



Dimensions. Radius of the arms 015 to 0'3, breadth 0'05. 



Habitat. Pacific, central area, Station 274, surface. 



7. Rhopalodictyum curvatum, n. sp. 



Arms of different size and at unequal distances, irregular, more or less curved, nearly cylindrical, 

 live to ten times as long as broad, with rounded blunt distal end. (There were observed only two 

 specimens of this remarkable irregular species ; in one specimen all three arms were simple, in the 

 other one odd arm forked. The length of the arms and the size of the angles between them seems 

 to be very different and variable. 



Dimensions. Radius of the arms 0'3 to 0'6 to 115, breadth 0'06 to 012. 



Habitat. Pacific, central area, Station 271, surface. 



Genus 263. Dictyocoryne, 1 Ehrenberg, 1860, Monatsber. d. k. preuss. Akad. 



d.-Wiss. Berlin, p. &30. 



Definition. S pongodiscida with three spongy arms on the margin of the 

 circular or triangular disk, connected by a spongy patagium of different texture. 



The genus Dictyocoryne differs from the foregoing Rhopalodictyum only in the 

 patagium, connecting the three spongy arms, and beaxs to it the same relation as in 

 the Porodiscida JEuchitonia does to Rhopalastrum. The typical species of this 

 genus is Dictyocoryne prqfunda, the only species figured by Ehrenberg. After his 



Net with clubs ; tlxrrvtt, *ow>. 



