188 
Fig. 12. 
Fig. 13. 
Fig. 14. 
Fig. 15. 
Fig. 16. 
Fig. 17. 
Fig. 18. 
Fig. 19. 
Fig. 20. 
Fig. 21. 
Fig. 22. 
Fig. 23. 
Fig. 24. 
Fig. 25. 
Fig. 26. 
MARINE ALG ETC. OF THE * SEALARK ' EXPEDITION. 
Caulerpa cupressoides var. typica forma Gardineri, f. n. 
Habit of plant (dried specimen), showing minute distichous pinnules. (Nat. size.) 
Habit of plant (specimen preserved in formalin), showing minute tristichous pinnules. (Nat, 
size.) Figs. 12 and 13 are from drawings supplied by Madame Weber von Bosse. 
Cladocephalus excentricus, sp. n. 
Habit of plant: a, in surface view, seen from above; b, in side view. (Nat. size.) By an 
error the stipes in fig. 14a is erroneously shown as if visible through the frond. 
External view of frond showing the labyrinthiform pseudo-cortex, composed of repeatedly 
divaricato-dichotomous filaments closely interwoven. (X 280.) 
Single lateral mature branch arising from a main filament, constricted near the base and 
showing the divaricato-dichotomous system of branches which interlocking with their fellows 
form the labyrinthiform pseudo-cortex. (x 230.) 
Main filaments of frond near apex, showing young lateral branches in various early stages of 
the division shown in the preceding figure. (x 230.) 
Tydemania expeditionis, Weber van Bosse. 
Creeping flabellate form of the plant; portion of the ramified non-septate axis, cylindric below, 
torulose above, and bearing about a dozen flabella. (x 3.) 
A torulose branch of the axis bearing a mature flabellum, the upper half of which has been cut 
away. At the apex of the continuation of the branch is a young flabellum in the first stages 
of development. (x 16.) 
Avrainvillea amadelpha, A. & E. S. Gepp. 
Habit of mature plaut, deep-water form, Saya de Malha, 29 fms. (Nat. size.) 
Filament of frond, cylindrical below, torulose and tortuous at apices. ( x 110.) 
External view of frond showing the pseudo-cortex, composed of the interwoven torulose apices 
of the frond filaments. ( x 280.) 
Avrainvillea Gardineri, sp. n. 
Habit of mature plant, showing long unbranched rhizome, short stipes, and large thin zonate 
lacerate frond. (3 nat. size.) 
Filament of frond, more or less torulose for a considerable distance behind the apex, and not 
attenuated towards apex. (x 110.) 
Turbinaria Murrayana, Bart. 
Mature plant, showing typical cone of solid trigonous leaves above, and numerous stolons 
below, one of which has already produced a bud (a). (Nat. size.) | 
Young plants arising from stolons. a. Seen from above, showing rosette of primitive leaves, 
shortly stalked, flat, cuneate at base, the oldest being lanceolate and longly acuminate, each 
subsequent leaf approximating gradually to the typical trigonous normal leaves, of which two 
small ones are seen in the middle. 5. A similar young plant, in side view. (Nat. size.) 
Turbinaria ornata, J. Ag. 
. Young plants which have arisen from stolons, showing one or two primitive lanceolate leaves 
which are more serrate than the primitive leaves of T. Murrayana, Bart. (Nat. size.) 
