Ser. Chlorospermeye. Fam. Siphonacea. 



Plate XXX. 



CAULERPA CYLINDRACEA, Sond. 



Gen. Char. Frond consisting of prostrate surculi rooting from their lower 

 surface, and throwing up erect branches (or secondary fronds) of 

 various shapes. Substance horny-membranous, destitute of calca- 

 reous matter. Structure unicellular, the cell {frond) continuous, 

 strengthened internally by a spongy network of anastomosing fila- 

 ments, and filled with semi-fluid, grumous matter. Fructification 

 unknown. — Caulerpa [Lamour.), from kclvXos, a stem, and epirw, 

 to creep ; creeping surculi are characteristic of this genus. 



Frons ex s/trculis prostratis hie illic radicantibus et rands erectis polymorphic 

 formata. Substantia corneo-membranacea. Structura unicellulosa, cellular 

 membrand continud hyalind intus filis cartilagineis tenuissimis anastomo- 

 santibus Jirmala et endochromate denso viridi repleta. Fruct. ignota. 



Caulerpa cylindracea ; surculus filiform, glabrous ; fronds erect, subses- 

 sile, linear, simple, imbricated throughout with lineari-clavate, obtuse, 

 erecto-patent ramenta. 



C. cylindracea ; surculo filiformi glabro ; fronde erecta simplici lineari per 

 iotaiu longitudinem ramentis lineari-clavatis (vix " cylindraceis") obtusis- 

 simis erecto-pafentibus imbricata. 



Caulerpa cylindracea, Sond. in PI. Preiss'. v. 2. p. 151. Harv. Alg. Austr. 

 Exsic. n. 557. 



Caulerpa lsetevirens, Hani, in Trans. R. I. Acad. v. 22. p. 563; an Mont. 

 Fog. Pol. Sud, p. 16. t. 6./ 1? Sylloge, p. 452. 



Chauvinia cylindracea, Kutz. Sp. Alg. /?. 498. 



Ahnfeldtia cylindracea, Trevis. in Linn. v. 22. p. 144. 



Var. (3. macra ; surculi much developed; fronds short, with a few distant, 

 subdistichous ramenta. (Plate XXX. Fig. 2.) 



Var. /3. macra ; surculo elongato ramoso ; fronde brevi tenui, ramentis paucis 

 vage sparsis v. subdistichis. 



Caulerpa cylindracea, Harv. in Trans. R. I. Acad. v. 22. p. 563. Harv. 

 Alg. Austr. Exsic. n. 558. 



Hab. Western Australia. Very abundant on the reefs at Rottnest Island. 



— Var. ft. At King George's Sound, IF. H. H. 

 Geogr. Distr. Ins. Toud, I)' Urville. 



Descr. Surculi forming a mat, several inches long and broad, filiform, twice 

 as thick as hog's bristles, glabrous and glossy, shrinking when dry, 

 with larire and abundant roots. Fronds 3-6 inches long, erect, linear, either 



