THE 



YOYAGE OF H.M.S. CHALLENGER. 



ZOOLOGY. 



REPORT on the Marseniad;e collected by H.M.S. Challenger during the 

 Years 1873-76. By Dr Rudolph Bergh, Physician to the General 

 Hospital of Copenhagen. 



INTRODUCTION. 



The family of the Marseniadse has slowly gathered round the Helix perspicua, first 

 defined by Linne - in the tenth edition of his Systema Naturae, 1 and the Bulla latens of 

 0. Fr. Mtiller. 2 These forms, without an externally visible shell, were left for long 

 unnoticed, until M. Sars 3 recalled attention to Bulla latens, while Cuvier 4 had meantime 

 investigated a form nearly related to that mentioned by Strom and by Linne", and had 

 described it under the name of Sigaret, which he borrowed from Adanson. A form at 

 least congeneric (Lamellaria tentaculata) was "described by the English naturalist Mon- 

 tagu, 5 and referred by him to his genus Lamellaria. The resemblance, however, between 

 the title bestowed by Montagu and the generic designation of a group of Algse {Laminaria, 

 Lamouroux), as also the fact that the name Lamellaria cannot be fitly applied to the 

 first and typical section of Montagu's genus, led Leach to advocate the disuse of the 

 term. About 1819, in the British Museum, and a year later in his Synopsis, 6 he applied 



1 Syst. Nat., 1758, ed. x. t. i. p. 775, No. 620. 



2 Zool. Dan. prodr., 1776, p. 242, No. 2923. 



3 M. Sars, Beskriv. og Jagttag. over nogle masrkelige eller nye i Havet ved den Bergenske Kyst levende 

 Dyr. Bergen, 1835, p. 67 (Ms.- 1837, p. 754 (Sigaretus Strcemii) ). 



4 Bull. Soc'Philom. Paris, Oct. 1799, No. 31, p. 32.— Sur l'Haliotide, le" Sigaret, &c. (Mem. sur les Moll., 

 1817, No. 18). 



6 Trans. Linn. Soc. Lond., 1811, vol. xi. p. 179. 



6 The opinion of Herrmannsen (Ind. Malacoz. primordia, t. ii. p. 23) that Miiller's Bulla latens should be 

 the type of the genus, is really based only on the fact that this species was labelled Marsenia latens in the col- 

 lection of northern Molluscs sent by H. Beck (Museum Christiani viii.) to the assembly of naturalists at Kiel 

 in 1847. 



(ZOOL. CHALL. EXP. — PAET XLL — 1886.) Ss 1 



