THE CEYLON SPECIES OF CAULERPA. 115 



have observed it, in deeper water, e.g., at Trincomalee at a depth of from 10 to 15 m. It often grows 

 together with C. taxifolia as at Wehgama, where these two species occurred at a depth of about 1 • 5-2 m 

 It also occurs at the same place inside cavities in coral stones at a depth of about 3 m. 



•iji 



Fig. 10. — C. sertularioides (gm.) howe /. longiseta j. g-. ag. (1 X 1). 



Geographical distribut.ion. — Ceylon ; in many places ; in the upper part of the littoral zone (/. bre- 

 vipes and /. umbellata) and also in deeper water (/. longiseta) : Tangalla (/. brevipes) I Weligama (/. longi- 

 seta) ! Galle (/. brevipes, f. umbellata and f . longiseta [Kjellman in Wittr. et Nordst. Alg. exsicc. No. 344] ) ! 

 Colombo (Ferguson, Cey Ion Algae Nos. 3, 40:infl^er6. J. G. AgardhNo. 16,474(/. %m6e&toandNos. 16472, 

 16473, /. longiseta) ; Jaffna (/. brevipes and /. umbellata) ! Trincomalee (/. longiseta) ! 



Red Sea, Indiak Ocean, Pacific (to the Friendly Islands), Atlantic (from the West Indies to 

 Cape Verde). 



6.— CAULERPA FREYGINETII, C. Agardh. 



f. lata, Weber v. Bosse, Monographic des Caulerpes, p. 313. 



I have observed this Caulerpa only once, namely, on the south beach of the island of Mandaitivu out- 

 side Jaffna in the north of Ceylon, at a depth of about half a metre at low water. It is a pronounced sand 

 form, which has a strongly and well-developed rhizome creeping in the sand with short coarse assimilators. 

 These are spirally bent with branches entangled, forming as it were small matted balls that stick up out 

 of the sand. C. Freycinetii is very rich in forms and has an extensive distribution. /. lata occurs in the 

 Red Sea, in the GuK of Siam, and the Indian Archipelago as far as the Marian Islands and the Friendly 

 Islands. Reinke mentions that C. Freycinetii occui'S in East India, but does not specify any definite 

 locaUty. In any case it has not been noted before from Ceylon* where, however, it seems to be a rare 

 and accidental constituent, at least in the littoral flora. 



Geographical distribution. — Ceylon : Jaffna (the island Mandaitivu) ! Red Sea, Indian Ocean 

 Pacific, Atlantic (the West-Indies). 



7.— CAULERPA GUPRESSOIDES (Vahl) Weber v. Bosse. 



var. typica, Weber v. Bosse, Monographic des Caulerpes, p. 327. 



I have found this Caulerpa only once in the district investigated, namely in the upper littoral zone 

 atPaumben Pass, where it grew together with C longistipitata , Chrysymenia sp. and others. The plant 

 is thus very rare within the Ceylon marine-flora district, in any case in the littoral region at least. Weber 

 v. Bosse {loc. cit. p. 330) points out that the characteristic for this form (= voir, typica Weber v. Bosse) 

 is the great regularity with which the sub-navicular pinnules are arranged in three rows along the main 

 axis, while at the same time an occasional branch with the pinnules only in two rows is not rare. This 

 C. cupressoides from Paumben Pass corresponds exactly with this description and with Weber v. Bosse 

 drawings(/o . ci^ PI. XXVII, 7 b, 2a, 3, and XXVIII., 1). In general the main branches are three-sided, but 

 of the side branches of the last order an occasional one is two-sided. Moreover it corresponds exactly 

 with the specimens collected by Bobgesen from the West Indies. 



Geographical distribution. — South India : Paumben Pass ! ; Inmaji Ocean, Pacific, Atlantic 

 (the West-Indies). 



* It is however reported from the Laccadive Islands, Minikoi (Gardiner). 



