REPORT ON THE TUNIC AT A. 61 



Specimen A (PI. IV. fig. 1) measures 17 cm. in length, exclusive of the horn-like 

 projections on the posterior end of the body. The horns measure 4"5 cm. in length and 

 8 mm. in breadth. They are more flattened and more constricted at the base (PI. IV". 

 fig. 2) than those figured by Traustedt. 



The test is transparent, soft, and gelatinous, except on the ventral posterior part of 

 the body, where it becomes stifFer and considerably thickened to form a protecting pad 

 over the nucleus. The test forming the horns is also stiffer than elsewhere. Towards 

 the ventral edge of the body the test is raised up to form a number of conical pointed 

 projections, about V5 mm. to 2 mm. in height and in diameter at the base, springing 

 from slight hollows (see PI. IV. fig. 5). 



This specimen has a chain of embryos, about 5 mm. in thickness, placed at the 

 ventral edge of the posterior part of the body. The larger embryos when separated 

 measure each 4 mm. in length and 2 mm. in greatest breadth. 



This is the largest specimen of the species Salpa costata-tilcsii which I have seen. 

 A specimen in the British Museum collection, from Western Australia, measures 14 

 cm. in length. Traustedt, however, describes his largest specimen as being 19 cm. in 

 length. The British Museum specimen has the test tuberculated, like that of specimen 

 A above described. 



Specimen B is a fragment of the test of a very large Salpa, probably belonging to 

 this .species. It is about 1 2 cm. in length, and the body when entire must have been 

 considerably larger. It includes the thickened region covering the nucleus, and a part 

 of the tuberculated ventral surface of the test. The tubercles are of considerable size. 



Specimen C measures 6 cm. in length. The greatest breadth, just behind the 

 branchial aperture, is 3 "5 cm., while the breadth at the atrial aperture is 2 cm. The 

 test is very clear and transparent, the endostyle showing through it distinctly as a 

 conspicuous white line. The thickening over the region of the nucleus is placed more 

 posteriorly than is shown in Traustedt's figure,' or than I have seen it in other 

 specimens. It is nearly 2 cm. in antero-posterior length, and extends close up to the 

 atrial aperture posteriorly (PI. IV. figs. 3 and 4). There are pointed papillse scattered 

 over the ventral surface of the test, especially around the nuclear swelling and in front 

 of it, and a few" papillse are also found along the ventral lip of the branchial aperture. 



The dorsal tubercle of this specimen does not agree exactly with that figured by 

 Traustedt (see PI. IV. fig. 8). It differs slightly in the shape of all its parts, and the 

 languet does not project so much as is shown in the case of Traustedt's specimen. 



Specimen D measures about 14 cm. in length, but is not complete anteriorly. The 

 test is exceedingly soft and gelatinous, and very thin considering the large size of the 

 animal. Over the region of the nucleus, as usual, it becomes rather thicker and stiffer. 

 Tliere are no projections from any part of the surface of this test. 



1 Bidrag til Kundskab om Salperue, Tab. ii. fig. 39. 



