284 PERCY SLADEN TRUST EXPEDITION 
together, and cannot be separated without damage. The plant has distinct inflated 
articulations blunt at both sides, and is certainly different from Champia compressa. It 
strongly recalls Ch. parvula, especially the figure given by Kiitzing in his. Tab. Phyc., 
Band xv. tab. 89, where Ch. parvula is figured under the name of Lomentaria intertexta. 
The plant from the Seychelles is, hewever, very small, having a height of only 1 cm., and 
it is barren. 
CHYLOCLADIA, Greville. 
1. CHYLOCLADIA PERPUSILLA, n. sp. (Plate 16. figs. 4, 5.) 
Thallo minusculo, decumbente, ramuloso, cavo, sine diaphragmate; ramo_pri- 
mario interne multis cellulis magnis ; ramulis constantibus e strato unico peripherico 
cellularum magnarum et parvarum secundum quarum latus interne fila ramosa 
decurrunt, nonnunquam glandulas ferentia. Sporangiis in ramulorum dilatatorum, 
cavitatem prominentibus, nec in cavernis propriis sitis. Cystocarpiis et antheridiis 
ignotis. hallo lato 0°5-0°6 m. 
Saya de Malha, creeping on Udotea, 29 fms. 
This tiny plant was found creeping on Udotea, though it did not appear to possess 
rhizoids. It has a main axis, from which spring slender ramuli, sometimes opposite, but 
mostly irregular; the specimen is, however, so small that it is impossible to say much 
as to its ramification. The main axis has a length of 1 em. and a breadth of 600 n, the 
branches have a length of 2-5 mm. The branches are entirely hollow, but the down- 
growing filaments that are proper to the genus bear glands (?); the main axis is filled 
with large cells, loosely attached to one another. I could see no diaphragms, neither in 
the branches nor at the base of the branches; the tetraspores are scattered over the 
inflated top of some branches ; they protrude into the cavity of the branch, but they are 
not situated in a special hollow, as they are in Lomentaria. 
On account of the position of the tetraspores and the absence of diaphragms, I believe 
that this little plant belongs to the genus Chylocladia. Its small size characterizes it as 
a new species. 
C@LARTHRUM, Borgesen. 
1. C@LARTHRUM (ALBERTISII ?) (Picc.), Borg. 
Lomentaria Albertisii, Piccone, Alghe in ‘“ Crociera del Corsaro,” 1884, p. 37. 
Amirante, 20 fms.; dry specimen. 
Distribution. Canary Islands; Guadeloupe and Bermudas; West Indies; Malay 
Archipelago. 
I think it very probable that the alga from Amirante is Celarthrum Albertisii, because 
I found that species amongst the “Siboga” material. I cannot deny, however, that 
the specimen has smaller articulations than the type and that I did not see in my 
