1915.] A.Oxa: The Tunicata of the Indian Museum. 31 
Salpa cylindrica, Cuvier. 
Salpa cylindrica, Cuvier, Ann. du Mus. tome IV, 1804. 
Locality. 
Andaman Sea. Numerous specimens. 
Salpa scutigera-confoederata, Cuvier (Forskäl). 
Salpa confoederata, Forskäl, Descrip Anim., 1775. 
Salpa scutigera, Cuvier, Ann. du Mus. tome IV, 1804. 
Localities.—(1) Laccadive Sea, at Station 319, 12° 2’ N., 73° 46’ E.; depth of 
net 1154 fathoms; bottom green mud, globigerina ooze; November 7th, 1903. (2) 
Gulf of Oman, at Station 342, 24° 46’ 15” N., 57° 15’ E.; depth of net 745 fathoms; 
bottom soft green mud; October Igth, 1904. Four specimens. (3) Off Cinque Id., 
Andamans, surface. One specimen. (4) Andaman Sea. Two specimens. 
Fam. APPENDICULARIIDAE. 
Of this family the collection contains only a single specimen, but this specimen 
is highly interesting on account of its being unusually large and having voluminous 
spiracular passages which occupy nearly the middle third of the trunk. Very prob- 
ably it belongs to the rare genus Megalocercus, Chun. 
Megalocercus sp. 
This very interesting specimen is unfortunately in a somewhat shrivelled condi- 
tion, so that it was impossible to make out the internal structure satisfactorily. So 
far, however, as could be ascertained without injuring the unique specimen, it 
presents no character, except its slightiy smaller size, particularly contradictory to 
the description of Megalocercus abyssorum given by Chun (2). Whether it belongs to 
that species or not, it is of course difficult to say, but it appears to me very prob- 
able that it belongs to the same genus. 
The body including the tail is about 15°5 mm. long. The trunk alone is nearly 
5 mm. long and 3 mm. across at the widest part; it is elongated oval in shape, with 
the greatest width at the middle of the length and gradually narrowing towards both 
extremities. The anterior end is truncated and is occupied by the transversely 
elongated oral aperture, while the posterior end is rounded and a little compressed 
laterally. The anterior two-thirds are taken up mainly by the large pharynx and 
are comparatively transparent, but the posterior third is filled up with the gonads 
and is quite opaque. The endostyle is rather long and narrow, and runs along the 
ventral median line of the pharyngeal cavity ; it is somewhat widened at the anterior 
end where it joins the peripharyngeal band. The peripharyngeal band runs trans- 
versely in its ventral half parallel to the margin of the oral aperture, but in its 
dorsal half its course is more oblique, enclosing a triangular space on the roof of the 
pharyngeal cavity. The spiracula are very large; they form two large cavities 
symmetrically placed one on each side of the median line in the middle third of the 
trunk. It is these cavities that make this region the widest part of the trunk. The 
spiracular openings are about I mm. in diameter, and seem to have been circular in 
