20 W. A. HERDMAN. 



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

 taken together. The localities are : 



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



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



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

 condition) : 



SALPA RUNCINATA-FUSIFORMIS, Chamisso-Cuvicr, var. ECHINATA, Hrdm. 



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

 liy Herdman from the ' Challenger ' Collection as a distinct species, Salpa cchlnnta. 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 C'aliforniau 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 Larvacca. Univ. of Cal. Public. Zool., 

 vol. ii. (1905), p. 07. 



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



