100 On the Genus Amathia of Lamouroux, 



in the second edition, with these words added — Mus. No. 

 Hab. (?), Asiatic Ocean. I believe it came from the voyage 

 of Messrs. Lesueur and Peron. It is a little stouter and less 

 capillary than the preceding, with the extremities bent, and, 

 as it were, crisped (frisees). 



In the first edition of Lamarck, the author makes no 

 reference to Lamouroux, though he uses a name which that 

 naturalist had given him. He says, also, that it came from 

 Australasia, and was in his cabinet. Mr. M'Gillivray was of 

 opinion that my Serialaria australis was the same species. 

 I have copied Lamouroux's figure (pi. 4, fig. 1, edit, of 1816), 

 from which it will be seen that his species is entirely 

 different, not only because the cells are in a single series, but 

 because the setaceous appendages are of quite a distinct 

 form. Lamouroux's true S. comuta has, I believe, been 

 lately found at Port Jackson, where it is very common. It 

 is fairly represented by his figures, of which a copy is here 

 given. 



267. A. unilateralis. — Branches bent inwardly, groups of 

 cells very close, almost touching, and placed on the same 

 side. 



A. u. } ramis arcuatis, conglomerationibus cellularum 

 approximates, unilateralibusque. Mediterranean Sea. 

 Bed. Balbis. 



Serialaria unilateralis. — Lam. loc. cit.; also Lamouroux, 

 Esposit. Meth., p. 10, pi. 66, fig. 1 and 2 ; Ency. Meth. Zooph., 

 p. 43. M. Deshayes adds (second edit. Lamarck, p. 170) — 

 Inhabits the Mediterranean coast. M. Blainville regards this 

 species as a true Plumularia (Manuel, p. 476). But this 

 opinion appears to me altogether inadmissible. This species 

 is not mentioned by Lamarck. 



268. A. alternata. — Lamouroux. — Very much branched, 

 groups of cells, very long alternate on the branches, and very 

 close ; cellules numerous, of equal size. A. a. ramosissima, 

 conglomerationibws celhdarum alternatis, approximatiss- 

 imis, cellulis numerosis, subcequalibus. American Seas. 

 The Antilles, Deshayes. 



Expos. Meth., p. 10, pi. 65, figs. 18 and 19; Encyclop., p. 

 44 ; Serialaria alternata, Deshayes, Lam. loc. cit. 



269. A. convoluta. — Lamouroux Poly. Flex. p. 160. — All 

 the cells united, and forming one single, exsert group, twisted 

 in a spiral manner round the stems and branches. 



A. c. cellulis cocdescentibws ; conglomeration cellula- 

 rum eminente, contortos ; Australasian seas. — EncycL, p. 44, 



