with a Description of a New Species. 101 



Serialaria crispa. — Lamarck, first edit., n. 4, p, 131, Vol. 2., 

 M. Edw. and Desli ; Lamarck, second edit. S. convoluted — 

 Blainville, op. cit., p. 476. They add seas of New Holland. 

 Peron and Lesuenr. — My collection (Lamarck's) a little 

 smaller than the preceding (A. spiralis, Lamouroux). It is 

 ramose, paniculate ; its spiral is less regular, wider, plicate, 

 almost fringed, and sometimes interrupted. 



270. A. spiralis. — Lamouroux. — Kamose, dichotomous; 

 cells forming a single group, spirally twisted round the axis, 

 and adhering by the internal pores of the cells. A. s. 

 ramosa dichotoma, cellulis coalescentibus, conglomeratione 

 spirali, facie interne axi adJierente, Australasian seas. 

 Peron and Lesuenr. 



Serialaria convoluted, Lamarck, first edit., Yol. 2, n. 3, p. 

 130 ; second edit. (Milne Edw. and Desk), Yol. 2, p. 171 ; 

 Lamouroux Expos. Meth., p. 10, pi. 65, figs. 16, 17; Encyclop., 

 p. 44 ; Serial, conv., Schweigger, op, cit., p. 476 ; Serialaria 

 spiralis, Blainville, op. cit., p. 476. Lamarck adds : — " My 

 collection, stem from 15 to 18 inches long, sustaining alter- 

 nate branches, which are simple filiform, surrounded by a 

 clasping, spiral, continuous series of coherent cells." 



I have reproduced the figure given by Lamouroux. It 

 has a slight resemblance to my A. bicornis (Serialarii 

 spiralis * nobis), but the cells are unarmed, and attached by 

 their inner wall. I have not seen this species ; but as there 

 seem to be so many in Australia, and as a good number of 

 those enumerated as gathered by Peron were found in West 

 Australia, or near the Bight, probably this will still be found. 



The following species not described by Lamouroux in his 

 first work (though mentioned in his Eicposition MethodiqueJ, 

 are described by Messrs. Milne Edwards and Deshayes in 

 the second edition of Lamarck. 



A. acevvata. — Lamouroux. — S. pumila, pannn ramosa, 

 subdichotoma, ramis capillaceis, tenuisissimis, cellulis sub- 

 clisjunctis in massomi distinctam distanterque congregatis. 

 Serialaria acervata, M. Ed. and Desh. Lamk., op. cit., p. 170; 

 Blainv., op. cit., p. 476. In form the groups of cells are dis- 

 tant a millimetre from one another. They are composed of 

 nearly 20 cells, heaped without order around the subdichoto- 

 mous stems, which are not much branched, and isolated 

 during the greater part of their length. 



A. precatoria. — Larnouroux.^ — S. ccespitosa, ramosissima; 



* Proceed. Roy. Soc, N.S.W., 1877, p. 84. 



