V. 



Individual, sexual generation Colonial, asexual general 

 (Proles solitaria (by Chamisso)) (Proles gregata (by Chamisso)) 



(S, democratica Forskal (S, mucronata Forsk. 



' (S, spinosa Otto (S. pyrawldalis Quoy and Gaimard 



__ _ « . c i (S, maxima Forsk. 



II. S. aflnama Forsk. ^ ForskatU Lesson 



TTT „ . _, (S, fusiformis Cuvier 



III. S. runc%nata Chamisso to £ ~ ~4~ c~„~i, 



CS. maxima var. prima Forsk. 



(S. runcinata gregata Cham 



IV. 5.* S, punctata Forsk. 



(S, aoutigera Cuv 



(S, vivipara Peronet § Lesueur (S. bicaudata Q. and G. 



(S, gibta Bosc. (S, nephodea Less. 



(S, dolium Q. and G. 



VI. S. *(like S. p-innata Cham.) S. proboscCdal-ts Less. 



,._ T „ j-~ • r> j n (S» zonaria Cham. 



VII. 5. oo*difoxmu> Q. and G. ^ polyevatica Forsk. 



By the mark in Krohn's table is meant new, discovered 

 species, to which he did not give names. 



Later on, on the basis of these data of Krohn, in systematics 

 of Salpa, double specific designations were established, for 

 example, Salpa demooratioa mucronata, S, maxima-africana 3 

 S, runcinata-fusiformis and so on (585) . 



(138) About the same succession of development (at the 

 beginning placenta, and then the embryo itself), referring to 

 Krohn's data, V. V. Zalenskii, the famous investigator of Salpa 

 embryology spoke later on. (Ueber die embryonale Entwicklungsges- 

 chichte der Salpen. Zts. wiss. Zool., 27, 1878, S. 179-237) (586). 



(139) V. N. Ulianin, to whom science is indebted due to recent 

 ideas about the structure and development of these organisms, in the 

 work, published 30 years after Krohn, gave, of course, detailed data 

 but very similar to Krohn representation of their larvae. In par- 

 ticular, he re marked on the development and reduction of this 

 ectodermal swelling on the boundary of the trunk and caudal part, 

 which Krohn called "vesicle-like appendix" (588) . 



(140) The printed works of Krohn are distributed between the 

 subjects of his investigations in the following way (in brackets 

 the number of publications is indicated): Protozoa (1), Diciemids 

 (?), Coelenterata (6), Nemertinea (1), ring worms and forms, which 

 were appointed to the latter by him (Sepunculidae, Phoronidae, 

 Chaetoganthae) (16), (Bryozoae (1), Molluscs (22), Arthropodae (10), 

 Echinodermatae (11), Tunicatae (7) and vertebrates (4) (594). 



654 



