32 Memoirs of the Indian Museum. [Vor. VI, 
life. The spiracular cavities are mostly lined with ordinary flat cells, the ciliated 
epithelium being present only at certain places inside the external openings. The 
tail is 13 mm. long and 3 mm. wide; the median muscular portion measures 2 mm. 
in breadth and is thus wider than half the breadth of the tail. The colour of the 
specimen preserved in alcohol is dirty greyish-yellow. 
There is in the same bottle a detached tail of another individual; it is about 
Io mm. long and 3 mm. across. It is somewhat darker in colour, being a little 
brownish, but otherwise differs in no respect from the tail of the uninjured specimen 
described above. 
The genus Megalocercus contained hitherto only a single species, M. abyssorum, 
known from three specimens collected by Chun near Capri and Ischia from a depth 
of six to nine hundred meters. They are 18, 22, and 30 mm. in length respectively. 
BIBLIOGRAPHY. 
(1) Bourne, G. C. Oligotrema psammites: a new Ascidian belonging to the 
Family Molgulidae. Quart. Journ. Micr. Sci., Vol. XLVIII. 1903. 
(2) Chun, C. Die pelagische Tierwelt in grösseren Meerestiefen und ihre Bezie- 
hungen zu der Oberflächenfauna. Bibliotheca Zoologica, Heft I. 1888. 
(3) Hartmeyer, R. Ein Beitrag zur Kenntnis der japanischen Ascidienfauna. 
Zool. Anz., Bd. XXXI. 1906. 
(4) Heller, C. Untersuchungen über die Tunicaten des Adriatischen Meeres. 
Denkschr. Akad. Wien, 1874-77. 
Beiträge zur näheren Kenntnis der Tunicaten. ee Akad. 
Wien, Bd. LXXVII. 1898. 
(6) Herdman, W. A. Report on the Tunicata collected nate the Voyage of 
HMS. Challenger during the years 1873-1876. Rep. Voy. Challenger, 
Vols. VI, XIV, XXVII. 1882-1888. 
(7)——On the Tunicata. Ceylon Pearl Oyster Fisheries, Pt. V. 1906. 
(8) Kiaer, J. Oversight over Norges Ascidiae Simplices. Forh. Selsk. Kristiania, 
1893. ; 
(9) Michaelsen, W. Revision der Kompositen Styeliden oder Polyzoinen. 
Mitt. Mus. Hamburg, Bd. XXI. 1904. 
(10) Oka, A. Zur Kenntnis der zwei aberranten Ascidiengattungen Dicopia 
Sluit. und Hexacrobylus Sluit. Zool. Anz., Bd. XLIII. 1913. 
(11) Sluiter, C. Ph. Uber einige einfoche Ascidien von der Insel Billiton. 
Natuurk. Tydschr. Nederl. Ind., D. XLV. 
Einfache Ascidien aus der Bai von Batavia. Natwurk. Tijdschr. Nederl. 
Ind. Aa XLVE 
BE Olean aren der Siboga-Expedition, I Abt. Die Sozialen und Holosomen 
Ascidien. Szboga-Exped., Bd. LVIa. 1904. 
(14)——-Zwei merkwürdige Ascidien von der Siboga Expedition. Tijdschr. 
Nederl. dierk. Ver sen. 2, VOL UI, Zrgos. | 
(5) 
(12) 
