84 THE VOYAGE OF H.M.S. CHALLENGER. 



The specimen is nearly 7 cm. in length, but it has only eight muscle bands, while 

 Traustedt figures nine, and in his description says 9(-10) are present. The first, 

 second, and third muscles approximate in the mid-dorsal line. Part of a chain of 

 embryos is seen near the posterior end of the body, behind the visceral mass. 



Salpa scutigera-confcederata, Cuvicr — Forskahl (PI. IX. fig. 9). 



Salpa confoederata, Forsk., Descrip. anim., p. 115, 1775. 



Saljia scuiigcra, Cuvier, Ann. du Mus., torn. iv. p. 377, 180-1. 



Salpa scidigcra-confcederaia, Vogt, M(5m. de I'lnstit. Genev., torn. ii. p. 6, 1^54. 



Salpa scutigera-ccmfcvderata, Traustedt, loc. cit , p. 362, which see for further synonymy. 



This species was obtained at the following localities: — 



(1.) October 27, 1874; Station 202, off the Philippine Islands; lat. 8° 32' 0" N., 

 long. 121° 55' 0" E. ; surf temp. 83°; five specimens of the aggregated form. 



(2.) November 6, 1875 ; South Pacific; lat. 37° 50' 0" S., long. 93° 54'0" W. ; surf. 

 temp. 59°"5 ; one large specimen (in bad condition). 



The specijnen obtained in the South Pacific, on November 6, 1875, is very large, 

 being about 8 cm. in length, but it is in such bad condition that it is imj^ossible to 

 determine whether it is a solitary or an aggregated form. In fact, the specimen only 

 retains the torn and decayed test, and sufiicient of the mantle to show the characteristic 

 X-shaped muscle bands, and thus indicate the species. 



The aggregated forms from Station 202, at the Philippines, are all small, and vary 

 in length from TS cm. to 17 cm. The breadth of the body at the posterior end is 

 8 mm. In all of these specimens there are curved horn-like processes at the posterior 

 end of the body, which are not shown in Traustedt's figures. Possibly they are only 

 present in the young, and disappear afterwards. These processes are fully 5 mm. in 

 length, and contain prolongations of the mantle into their interior (PI. IX. fig. 9). 



All these specimens had been preserved in picric acid, and are not in good con- 

 dition, their tissues being very brittle. For Saljm strong spirit is undoubtedly much 

 better than picric acid. 



Salpa quadrata, n. sp. (PL IX. figs. 1-8). 



External appearance. — The body is short aud of rudely quadrate form ; it is com- 

 pressed from side to side, and of considerable extent dorso-ventrally. Both ends are 

 truncated, and the anterior is broader than the posterior. The apertures are terminal 

 and are both slightly depressed, with no very prominent lips. Both dorsal and ventral 

 edges are nearly flat. The surface is quite smooth. 



