Analytical Synopsis of the Order of Squall. 369* 



2. Squalus dentihus obtusis seu granulosis = Mustelus Isevis Flem. 



Dentibus acutis prsediti. 

 Dorso spinoso. 



3. Squalus pinna ani nulla; ambitu, corporis sie6?'0^wnc?o = Squalus 



acanthias Linn. 



4. Squalus pinna ani carens ; naribus in extreme ros^ro zrSpinax niger 



Cloquet. 



5. Squalus ^?m?ia ani carens; ambitu corpioris triangulate = Oxynotyi& 



centrina Haf 



6. Squalus pinna ani carens; ere in ajnce capitis =.Y\h\MB. squatina 



Raf. 



Spinis dorsi carentes. 

 V. Squalus capite latissimo transverse 7nallei Mis/arz=Cestracion zygaena 

 Gill. 



8. Squalus cauda longiere quam ipisum corpus = Alopias vulpes Bon: 



9. Squalus naribus ori vicinis,foraminibus exiguis ad oc?< ^o5=GaleorhiDus 



galeus Blain. 



Rostris brevioribus. 



10. Squalus ex rufo varius^ pinna ani medio inter anum et caudam 

 j^mnaiMm zi:Scylliorhinus caniculus, Bl. 



11. Squalus derso vario ; pinnis ventralibus concretisz=:'No. 10. 



12. Sqnalas cinereus ; pinnis ventralibus disc7'etis=Catu\n& stellaris Sm. 



Rostris longioribus. 



13. Squalus /ossM^a triangulari in extreme dorsi, ferami^iibus nullis ad 



ocM?os = Cynocepbalus glaucus Gill. 



14. i^qn'An?, dorso i^lano, dentibus i^lurimis ad latei-a serratisz^Carcha- 



Todon lamia Ben. 



It lias been accepted as a maxim by some modern naturalists, 

 and especially by ornithologists, that the first-mentioned species 

 of a genns should be regarded as its type unless another is 

 expressly affirmed to be such. But even many of the modern 

 naturalists consider that the type should be regarded as the cen- 

 tral form, before and after which such variant species as exhibit 

 a greater tendency or affinity to other groups, should be respec- 

 tively placed. It is at least evident from the examination of 

 the works of the naturalists of the past century that tkey never 



