34 THE VOYAGE OF H.MS. CHALLENGER. 



1'5 cm. in greatest breadth. The short colony is nearly cylindrical, with the closed 

 end rounded. The common cloacal aperture is very small. The processes on the out- 

 side of the colony are still very short, and are simply conical or hemispherical. The 

 Ascidiozooids are small, a large number of them ajDpearing to be still immature. 



(4.) A small colony obtained at Station 204, off the Philippine Islands, November 2, 

 1874, lat. 12° 43' 0" N., long. 122° 10' 0" E. ; depth, 100-115 fathoms ; surf temp. 84°, 

 is very probably referable to Pyrosoma giganteum, but has not the cylindrical shape 

 usual in that species. It is a little over 3 cm. in length and 1'5 cm. in breadth at the 

 Ijroadest point, which is near the middle ; from this point it tapers towards both ends. 

 The common cloacal aperture is large. The processes on the outside of the test are 

 prominent, some of them being especially large. These have the flattened lanceolate 

 extremities characteristic of the species. 



(5.) One specimen and half a dozen fragments of Pyrosoma colonies were found at 

 Station 160, March 13, 1874, lat. 42° 42' 0" S., long. 134° 10' 0" E. ; surf temp. 55°, 

 bottom temp. 33°'9, in the trawl, which had come up from a depth of 2600 fathoms. 

 The complete colony is 27 cm. in length and 2 cm. in breadth. It scarcely tapers, and 

 has a well-marked sphincter. It may possibly belong to Pyrosoma giganteum ; but it 

 is in such a decayed condition, the w^hole surface of the colony being ragged, and the 

 Ascidiozooids indistinguishable, that the species cannot be determined with certainty. 

 The fragments found at the same locality are in an equally bad state, and none of them 

 even indicate the size and shape of the colonies they belonged to. Probably all of these 

 were dead and decayed specimens when they were captured. 



(6.) Two small colonies obtained on September 10, 1873; Station 122; off the 

 coast of Brazil; lat. 9° 10' 0" S., long. 34° 49' 0" W. ; surf temp. 77°-5, may possibly 

 belong to Pyrosoma giganteum, Lesueur, but the characters are not well marked. 

 They measure respectively 2 '5 and 1'8 cm. in length, and are both 1 cm. in breadth. 

 The Ascidiozooids in both are rather large, and the processes on the outside of the 

 colony are rather prominent in the larger specimen. 



(7.) Four small colonies collected on the surface of the West Pacific Ocean, north of 

 the Admiralty Islands, on March 16, 1875 ; Station 222 ; lat. 2° 15' 0" N., long. 146° 

 16' 0" E. ; surf temp. 82°"8, may possibly be Pyrosoma elegans, Lesueur, but are not 

 fully enough developed to be referred with certainty to their species ; they present 

 some points of interest. Their dimensions are as follows : — 



A. B. C. D. 



Length, . . . . 1-3 cm. 1'5 cm. 1'7 cm. IS cm. 



Greatest breadth, . . . TO cm. 1-0 cm. 0-7 cm. 0-9 cm. 



In all of them the Ascidiozooids are large and conspicuous, and in one (specimen B) 

 they project from the surface of the colony in the form of short truncated cones, from 

 1 to nearly 2 mm. in length (PI. II. fig. 8). There are no projections from the surface 

 of the test beyond those formed by the Ascidiozooids. At the closed end of this 



