22 Memoirs of the Indian Museum. . |) [Vora Nae 
Botryllus is not in itself suggestive of the occurrence of budding, since exactly the 
same condition is also met with in certain species of simple Ascidians, e.g. Ascidia 
lurida, Möll., Ascidiella expanse, Kiaer, Ascidiella minuta, Kiaer, etc. which certainly 
do not propagate by gemmation. 
As this species cannot be included in any of the known genera of the Ascidiae 
Simplices, it was found necessary to form a new genus for its reception. This genus, 
which I propose to name Monobotryllus in reference to its great resemblance to 
Botryllus, may be diagnosed as follows:— 
Monobotryllus, nov. gen. 
Test leathery, both apertures not lobed. 
Tentacles simple, filiform. 
Branchial sac without folds, with numerous internal longitudinal bars. 
Alimentary canal lying alongside the branchial sac; stomach longitudinally 
folded, with a small blind sac. | 
Reproductive organs consisting of a number of hermaphrodite polycarps arranged 
in two rows, one on each side of the endostyle; each polycarp made up of an 
ovarial and testicular part joined together to form a rounded mass. 
As to the systematic position of this genus it is quite obvious that its nearest 
allies are those forms among the Polystyelidae which have no folds in the branchial 
sac, e.g. Goodsiria and Chorizocormus ; but as it is a solitary form I have thought it 
more convenient to place it in the family Styelidae alongside the genus Polycarpa. 
In the structure and arrangement of the polycarps it comes very near Michaelsen’s 
Monandrocarpa, which is known only from a solitary individual but which the 
author is inclined to regard as the young stage of a colony. The presence of a small 
curved blind sac attached to the posterior end of the stomach seems to point to a 
close affinity to the Polystyelidae, whose members are invariably provided with such 
an appendage, while on the other hand the simple unlobed condition of the branchial 
and atrial apertures would rather suggest a near relationship to the Botryllidae. 
Fam. ASCIDIIDAE. 
This family is represented in the collection by five species, which, with the 
exception of a single doubtful form, are all new to science. They all belong to the 
genus Ascidia. The doubtful form could not be identified with certainty, as the 
internal body had been removed from the test, the latter alone being preserved. 
Ascidia canaliculata, Heller (?). 
(Pl. IV, fig. 4). 
Ascidia canaliculata, Heller, Beiträge zur näheren Kenntnis der Tunicaten. Sitzungsber. Akad. 
Wiss. Wien. Bd. LXXVII, 1878. 
Locahty.—The Andamans. One specimen (the test only). 
It is from the external appearance alone that I refer this specimen with much 
doubt to Heller’s Ascidia canaliculata, originally described from the Cape of Good 
