TUNICATA. 699 



in the same individual, but in two succeeding generations. The 

 parent animal, for instance, always resembles her grand-daughter 

 and her sister, not her daughter, which, again, resembles the pre- 

 ceding generation. This conclusion seemed to most succeeding 

 observers so strange, that they thought it could not be adopted j 

 MEYEN supposed that these animals are always born as single 

 individuals, and only become united subsequently. Nevertheless, 

 ESCHRICHT discovered within single individuals embryos connected 

 together in a wreath, so that hereby CHAMISSO'S conclusion was 

 established, that chains of connected Salpce were formed even 

 within the parent. STEENSTRUP brought this peculiarity in the 

 propagation of the Salpce into unison with other phenomena in the 

 animal kingdom, in his interesting work, Om Fortplantning og 

 Udvikling gjenem Generationsrackher, (see above, p. 70), and the 

 meritorious Norwegian observer SARS, completely confirmed it 

 (Faun, littor. Norvegice). With it too the numerous observations 

 lately communicated by KROHN, are in accordance. The solitary 

 Salpw are sexless, and are propagated by internal germs or buds 

 connected in strings. Hence the associated form appears to be 

 the most perfect, that in which organs of propagation are developed, 

 (and organs of impregnation also, testes) ; each individual of the 

 associated Salpce produces only a single young one. 



Sp. Salpa maxima FORSK. Icon. Tab. xxxv. fig. A, MILNE EDWARDS, Cuv. 

 R. Am., ed. ill., Moll. PI. 120, 121, fig. I (here belongs, according to 

 KROHN, Salpa Forskalii LESSON and the solitary form Salpa africana 

 FORSK.); S. runcinata CHAMISSO 1. 1. fig. v. Salpa fusiformis Cuv. Mem. 

 s. I. Biphores, fig. 10, SARS 1. 1. Tab. vin. figs. 44, 45, Tab. ix. ; Salpa 

 pinnata FORSK., S. cristata Cuv., FORSK. Icon. Tab. cit. fig. B, Cuv. Mem. 

 figs, i 3, 1 1, CHAMISSO 1. 1. fig. i (associated form arranged in a circle) &c. 



Note. The species of Salpce are not yet sufficiently known, of many at 

 least, the synonymy is very difficult, full of doubt. KROHN 1. 1. has endea- 

 voured to unravel the species from the Mediterranean. To the authors 

 already cited, the French voyagers QUOT and GAIMARD Voyage de I' Astro- 

 labe, Zoologie, Tom. in. 1835, pp. 559 598, PI. 86 89, are to be added. 



Anchinia ESCHSCH., RATHKE. Small Salpce aggregated in a single row 

 to a gelatinous filament. See WIEGMANN'S Archiv, 1835, i. p. 85. 



Doliolum QUOY and GAIM. [Body cask-shaped. Branchiae in two 

 bands with perpendicular bars, one on the dorsal (Jicemal) the other 

 on the ventral (neural) surface of the respiratory cavity, converging 

 and passing into each other posteriorly.] 



Doliolum OTTO differs from that bearing the same name : whether it be 

 a Beroe or a mutilated Salpa, I know not. Comp. Nov. Act. Acad. Leop. 

 Car. XI. Tab. 42, fig. 4. 



