REPORT ON THE TUNICATA. 
I 
41 
they are all new to science. One of the species was obtained during the “ Lightning ” 
expedition of 1868, the others are all Challenger specimens. The following scheme mves, 
in brief, the distinguishing characters of these new forms. 
^ O O 
Colour almost black. 
Colour not black. 
Botnjlloides nigrum. 
Tentacles sixteen. 
Colour purple. 
Four stigmata 
in each mesh. 
I 
B. •purpureum. 
Colour nat purple. 
Two or three stigmata 
in each mesh. 
B. fulgurale. 
Tentacles eight. 
Colour 
light 
brown. 
Colour 
light 
reddish. 
B. perspicuum. 
B. perspicuum, 
var. ruhicundum. 
The specimen which is described under the name of Botrylloides fulgurale was 
obtained during the ‘‘Lightning” expedition of 1868, from a depth of 530 fathoms. 
This is probably the greatest depth at which a Botrylloides has been found. 
Botrylloides 'pur'pureum, n. sp. (PI. 1. figs. 1, 2, and 3; and PI. II. figs. 1-11). 
The Colony is irregular in shape, large and spreading, and of moderate thickness. The 
surface is rather uneven, but smooth. The colour is a dark purple. A lighter area, is 
found around the anterior ends of the Ascidiozooids and at the edges of the colony, which 
in some places become colourless and transparent. The common cloacal apertures are 
fairly numerous and conspicuous. 
The length of the colony is about 7 ’5 cm., the breadth about 6 cm., and the average 
thickness about 2 mm. 
The Ascidiozooids are elongated antero-posteriorly, being about 2 mm. in length and 
rather less than 1 mm. in greatest breadth. The anterior, end, which is visible on the 
surface of the colony as a circular rather light coloured area, is about 1 mm. in 
diameter. 
The Test is soft but firm. In no part does it become thick. On its thin expanded 
edges, at the margins of the colony, it is transparent and colourless or of a pale grey hue, 
elsewhere it is light purple. The terminal knobs of the vessels are not very conspicuous. 
They are of moderate size and of a dark purple colour. In sections the test is seen to 
be formed of a homogeneous matrix in which numerous minute rounded and fusiform 
cells are scattered. It is penetrated in all directions by numerous ramifying and 
anastomosing vessels with swollen terminations. 
(ZOOL. CHALL. EXP. PART XXXVIII. 1885.) Pp 6 
