RADIOLAKIA OF THK TASMAN SEA HASAVELL. 'Ill 



owing to a peculiarity of which at present I have no explanation. 

 In this form, of which there are several specimens, all, unfortu- 

 nately, fragmentary, the zooids have the usual spherical form, 

 with a diameter of about '08 mm. They are in the anisoporous 

 phase with numerous small nuclei (-008 mm. in diameter) 

 arranged in rounded groups in the typical manner ; and there is 

 a large central oil-globule. There is a thin pseudopodial matrix 

 giving off delicate p.seudopodia which form a network. A few 

 Algse adhere to each zooid and many lie in the interspaces. 



There is a thin capsular-membrane ; but this is almost hidden 

 by a layer of minute bright bodies of about "0016 mm. in diameter, 

 which adhere to its outer surface. Whatever may prove to be the 

 nature of these bodies, there can be little doubt from the con- 

 stancy of their presence in this form and in this alone, that they 

 represent a definite structure or structures, and are not of the 

 nature of an artifact. 



COLLOZOUM OVALE, S]}. nov. 



(Plate liii., fig. 3). 



The prevailing form of the zooids is elliptical ; a few are- 

 constricted as if about to divide. Both of the specimens are in 

 the vegetative phase, with few (4-10) nuclei in each capsule. 

 The membrane is delicate, the protoplasm very granular. In 

 place of an oil-globule there is an irregular space towards the 

 centi'e giving off branching lobes from which finer channels pass- 

 out in a radiating manner through the protoplasm to the peri- 

 phery. There are no pseudopodia or pseudopodial matrix. A 

 very variable, though never very large, number of Algje are 

 closely applied to each membrane ; others occur abundantly in 

 the interspaces. 



The length of the longest capsule is 0-125 mm. ; its breadth 

 0-05. The average length is O'l, and the avei-age breadth 0-05. 

 The diameter of the nuclei is a little less than O'Ol. 



The nearest allies of this form seem to be C. ovatum, Haeckel,^ 

 and C. ellipsoides, Haeckel.^ The former has a single central oil- 

 globule, and the diameter of itsz ooids is two to three times as 

 great as in C. ovale. The latter has a number of oil-globules, and 

 the length of the zooids is even greater than in C. ovatum. 



" Haeckel, E.— The Radolaria, Chall. Rep., Zool., iriii., 1887, p. 25. 

 ■? Haeckel. Y..— Loc. ciL, p. 20. 



