20 W. A. HERDMAX. 



The two gatherings of general Plankton are so much alike that they may be 

 taken together. The localities are : 



(1) " 19. x. 01 ; Lat. 40 12|' S. ; Long. 32 27{' E." 



(2) "22. x. 01 ; Lat. 45 S. ; Long. 40 57' E. ; 8 P.M. ; surf. temp. 40." 



They both contain the following species of Salpidse (none of them in good 

 condition) : 



SALPA RUNCINATA-FUSIFORMIS, Chamisso-Cuvier, var. KCHINATA, Hrdm. 



The solitary form of the strongly echinated variety of S. fusiformis was described 

 by Herdman from the ' Challenger ' Collection as a distinct species, Salpa ecldnata. It 

 is, however, perhaps better, in the light of further knowledge, to regard it as a variety 

 merely. It was obtained by the ' Challenger ' Expedition in the South Pacific, near 

 the Straits of Magellan, and off the West Coast of Africa, and by Prof. Ritter* off 

 the Californian coast. It has also been described by Dr. Apstein f from specimens in 

 the Hamburg Museum. The present specimens measure 3 cm. in length. 



SALPA MUCRONATA-DEMOCRATICA, Forsk. Solitary Form. 



A large number of specimens with flagella measuring up to 6 mm. in length- 

 average length of body, 1 cm. Also a few specimens with much larger flagella up to 

 13 mm. long. 



SALPA MUCRONATA-DEMOCRATICA, Forsk. Gregarious Form. 

 Many specimens,.measuring about 1 cm. in length. 



SALPA HEXAGONA, Quoy and Gaim.- Solitary Form. 



Some imperfect specimens, with very broad muscle bands, probably belong to 

 this species. 



SALPA HEXAGONA, Quoy and Gaim. Gregarious Form. 

 A few specimens apparently of this form, with two embryos each. 



Passing now to the Collection in 48 tubes, we have : 



SALPA RUNCINATA-FUSIFORMIS, Chamisso-Cuvier. 



From the locality " 1. i. 02 ; Lat. 63 4^' S. ; Long. 175 43' E.," there are 

 two large specimens of the gregarious form, measuring about 5 '5 cm. in length, and 



* The Pelagic Tunicata of the San Diego region, excepting the Larvacea. Univ. of Cal. Public. Zool., 

 vol. ii. (1905), p. 67. 



t Die Salpen, Deutsche Siidpolar-Expedition 1901-1903, Berlin, Bd. ix., Zool. 1 (p. 165). 



