154 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



different from that of either Traustedtia multitentaculata or its sub- 

 species bicristata. 



The gut differs from that of the other species of Traustedtia in lying 

 in a more horizontal position. The stolon has a position similar to 

 that in the form bicristata. The eye (Dober) is of the ususal horse- 

 shoe form. 



The characteristic thing in thin species is the presence of 20 (Dober) 

 to 23 (Apstein) "tentacles," which Apstein describes as follows: 



Von der Leibashohle durchdringen den Mantel [test] eine Reihe Kanale, von denen 

 ich 23 zahlte. Diese Kanale setzen sich rohrenartig uber die aussere Mantelflache 

 fort und werden vom Mantel mit dicken Wanden versehen. Gegen das Ende schwel- 

 len die Fortsatze an, auch der Hohlraum erweitert sich, ist aber geschlossen. Wah- 

 rend die Salpe farblos war, sah ich in und an diesen Fortsatzen im Leben ein orange 

 bis braunes und gelbes Pigment. Da, wo die Fortsatze die aussere Mantelflache 

 verlassen, wird der Hohlraum von einem orange Pigment umgeben. Oft fanden 

 sich in der Mitte des Fortsatzes Querfalten und dann ebenfalls das orange Pigment 

 in der dicken Wand des Fortsatzes. Der erweiterte Hohlraum am Ende war orange 

 mit braun gefarbt, wahrend die Wand in zartem Gelb schimmerte. Der Hohlraum 

 shien meist leer zu sein, stellenweise fand sich eine feinkornige Masse, deren Natur 

 nicht erkennbar war. Am Vorder- und Hinterende fanden sich je 2 liingere Fortsatze. 



The shape of the body, the large number of "tentacles," the 

 absence of crests and toothed ridges, the arrangement of the muscles, 1 

 and the position of the visceral mass, demarcate the solitary form 

 of this species from that of either Traustedtia multitentaculata or its 

 subspecies bicristata. 



Apstein classed the radiate specimens in the collections of the 

 German Deep-Sea Expedition in the same species, "henseni," as 

 those he studied in the collections of the Plankton Expedition, mak- 

 ing no mention of the absence of crests and toothed ridges in the 

 "Deep-sea" specimens, and ignoring the presence of a much greater 

 number of "tentacles." His and Dober's drawings of the radiate 

 forms can not represent multitentaculata, for the shape of the body 

 and the shape and sculpturing of the test are very different in the 

 latter species. It seems necessary to recognize these radiate indi- 

 viduals as a distinct species, which for obvious reasons I name 

 radiata. This disposition of the matter must be regarded as tenta- 

 tive, pending restudy of the "Deep-sea" specimens. 



THE TRAUSTEDITAS IN GENERAL. 



Let me again suggest that reexamination of the solitary forms of 

 Traustedtia in the collections of the Tiefsee and Plankton Expedi- 

 tions may show the two tentative subspecies I have recognized, to 



1 Apstein (1906, b) in his discussion of the Tief see-Expedition specimens says "Die Muskulatur stimnn 

 mit der friiher beschriebonen uberein." By this he must refer to his description of the single specimen in 

 the collections of the Plankton Expedition, which he at first named Salpa verrucosa, and which I have 

 assigned, from his description to the species multitentaculata. The musculature in the two forms, according 

 to Apstein's figures, is really considerably different. Dober and Apstein bah worked upon specimens 

 collected by the Tiefree-Expedition. 



