124 STEENSTRUP ON THE BASKING SHARK. 



3. The existence of such a fringe places beyond a doubt that 

 the manner of living of the Pelerin is similar to that of the 

 ** whalebone " Whales ; so that this colossal Shark obtains its food 

 from the small animals that it sifts from the mass of water 

 ejected through the fringe. 



4. The rays of the branchial fringe or the elements of the 

 branchial " beard," as the microscopic researches of Hannover go 

 to prove, must be considered as very long and attenuated teeth, 

 an arrangement which gives to the genus Selachus a generic 

 character at present unique. 



5. Characterised by these branchial appendages. Selachians 

 existed in the seas of Europe during the Tertiary period, being 

 represented by Hannovera aurata of P. J. Van Beneden,| found 

 in the Belgian Crag near Antwerp. 



IX. — Prodromus Faun^ Molluscorum Grcenlandi^ 

 (in Rink's " Gronland," &c., 1857, pp. 75-100). By 

 Dr. O. A, L. MOrch. Revised and augmented by 

 Dr. 0. A. L. MOrch, University Museum, Copenhagen. 

 April 1875. 



£The species marked with an * are doubtful inhabitants of Greenland.] 



MOLLUSCA GRCENLANDICA. 



Classis I. — Andkogyna, Morch. 



Ordo I. — Geophila, Fer. 



*1. Arion fuscus, Miill. Probably introduced. 

 L. agrestis, L. According to Wormskiold. 



2. Vitrina angelicae, Bk. & Moll. Pfr. 



" The neat little Snail," Olaf. & Paulsen's Reise i Island. Helix 

 pellucida, Fabr., Faun. Groenl. Found alive all the winter, 

 chiefly at the hot springs where Angelica grows. 



3. Conulus Fabricii (Helix), Bk. & Moll. Pfr. 

 *4. Helix alliaria, Miller. 



Helicella Steenstrupii, Morch. Helicella sp., Stp., Conch, von 

 Island. Helix nitida, Fabr., F. G., n. 385. H. alliaria, 

 Forbes, Brit. Assoc, 1839, p. 142. 

 *5. Helicogena (Tachea) hortensis, Miill. (Igaliko ; Worm- 

 skiold.) 



6. Pupa (Vertigo) Hoppii, Moll. Pfr. 



7. Succinea grcenlandica, Bk. «& Moll. Pfr. (Gr. Kuksuk.) 



Ordo II. — Kygrophila, Fer. 



8. Planorbis (Nautilina) arcticus, Bk. & Moll. Dkr. 



9. Limnsea (Limnophysa, subg.) Vahlii, Bk. & Moll. 



(10.) var. a. nitens. L. Pingelii, Bk. & Moll. (In a pond at 

 Nepisetsundet.) 



t Bullet. Acad. R. Belg., ser. 2, vol. xxxi., 1871, p. 504. 



