NO. I OPINIONS 68 TO ']']. 53 



From the foregoing it appears that taxonomically Thalia 1791 is 

 practically coextensive with Holothuria 1758, but nomenclatorially 

 Hoi. thalia becomes the genotype of Thalia by absolute tautonymy." 



Cuvier (1798a, 389) emended Thalia to Thaiis as follows: 



VII. Les Thalides. (Thaiis) (Thalia Brug.) (Holothuria Lin.) [generic 

 diagnosis] " Une espece (thaiis physalus) (holothuria physalus Lin.) a de 

 longs et nombreux tentacules; les autres (holothuria thalia, etc. Lin.) en 

 sont depourvues. 



Thaiis takes Hoi. thalia as type, since Thaiis is only an emendation 

 of Thalia. 



Blumenbach (1799a, 472) mentions Thalia, quoting only one spe- 

 cies, lingulata (Atlantic Ocean) and citing Forster. 



Lamarck (i8oia, 356) accepts Thaiis, mentioning only one spe- 

 cies, trilineata (with references to Hoi. thalia 1758 and Thalia 

 Browne, 1756a, plate 43, figure 3, and referring to Bruguiere, 1791a, 

 plate 88, figure i ) . 



Blainville (1827, 108-109) separated from Salpa the group Cyclo- 

 salpa, with diagnosis ; he cites vS. pinnata Linn. Gmel., 6^. affinis 

 Chamisso, and adds : 



II faut, sans doute, rapporter a cette section les especes de thalides de 

 Browne, puisqu'elles se reunissent aussi en cercle ; peut-etre meme ne sont-ce 

 que des biphores pinnes, comme le pense M. de Chamisso; mais ce qu'il 

 est impossible d'assurer, tant les descriptions et les figures sont incompletes. 



According to the Code, the type of Cyclosalpa must be either 

 pinnata or affinis. Browne's species are excluded (Art. 30ejS) since 

 Blainville considered them as species inquirendae. Apstein (1915a, 

 186) has designated C. pinnata as type species. 



^^ Two possible interpretations come into consideration in connection with 

 Thalia 1791 as follows : 



First: Some authors might be inclined to consider Thalia a new name 

 for Holothuria 1758. In this event the question would arise as to whether 

 Thalia should take Hoi. physalis 1758 as genotype, because of the citation by 

 Linnaeus ; or whether H. thalia became the type of Thalia by absolute tau- 

 tonymy, and thus by the principle of renaming became also type designation 

 for Holothuria 1758. 



Second: Some authors might maintain that Bruguiere in 1791 divided the 

 genus Holothuria as it existed at the date of his writing, retaining Holothuria 

 for the Sea Cucumbers, and separating from Holothuria the genus Thalia. 

 In this latter alternative //. thalia undoubtedly becomes type of Thalia by 

 absolute tautonymy. 



The Secretary accepts the second interpretation on the ground that it seems 

 to him to correspond more clearly with the facts, and it also seems to simplify 

 the complications. 



