130 ZOOPHYTOLOGY. 
(fig. B,) as it is in nature, with four denticles, whilst in that 
marked a in the same plate, the ovicell is represented very 
like that of S. tricuspidata. In the ventricose form of the 
cells, however, Ellis’s fig. a differs so widely from Mr. Alder’s 
S. tricuspidata, that it cannot be referred to that species ; 
so that it is not improbable a third species, for which M. 
Edwards would retain the term 8S. polyzonias, may be in- 
cluded in the Linnean species. 
The differences in the mouth of the ovicell do not depend 
upon sex, for although,a considerable difference may be per- 
ceived between the small white male cell and the larger 
yellow female capsule, in S. polyzonias, the mouth has the 
same conformation in both. 
2. Gen. Cryptolaria, Busk (Micros. Journ., Vol. V, p. 173). 
1. C. exserta, un. sp. Pl. XIX, fig. 3. 
Mouth of cells exserted. Poljaion pinnate or bipinnate; branches 
straight, rigid. Ovicell 
Hab, vente Johnson. 
This appears to constitute a second species of the genus 
Cryptolaria, the other belonging to New Zealand, and in 
which the mouth of the cell is completely immersed. 
3. Plumularia. 
A new species, belonging to the P. pinnata-group, will be 
described subsequently. 
