16 
THE VOYAGE OF H.M.S. CHALLENGER. 
Sub-Genus 2. Glciucilla, Bergh. 
Glaucilla, Bergh, loc. cit., p. 295. 
Caput validum ; corpus subventricosum, brevicaudatum ; bracbia magis prominentia, 
papillis pluriseriatis. Penis inermis. 
1. Glaucilla marginatci (Reinh.), Bglr. 
Glaucilla marginata, Bergh, loc. cit., pp. 296-300, Tah. ix. A. 
North Pacific. 
2. Glaucilla briareus (Reinh.), Bgh. 
South Pacific. 
Glaucus atlanticus, 1 Forster (PI. XIV. fig. 16). 
Hirudo marina , Breyn, Phil. Trans., No. 301, vol. xxiv., 1705, p. 2045, pi. ii. fig/ 4. 
„ „ Du Pont, Phil. Trans., vol. liii., 1763, p. 57, pi. iii. 2 
Glaucus atlanticus, Forster, Voyage round the World in the “Resolution,” 1877, vol. i. p. 49. 
Voigt, Magazin, Bd. v. p. 4, 1803, p. 336, Taf. viii. 
,, ,, Blumenbach, Ahbild. naturg. Gegenst., Taf. xlviii. 
,, „ Lichtenstein, Eorsteri descr. anirn., 1844, p. 11. 
Doris radiata, Grnelin, Syst. Nat., vi., 1790, p. 3105. 
Scyllcea margaritacea, Bose, Hist. nat. des Vers, t. iii., 1802, p. 101, pi. iii. fig. 8. 
„ ,, B. Bory de St. Vincent, Voyage aux quatres principales lies de lAfrique, 
pi. vi. fig. 1, a, c. 
Glaucus hexapterygius, Cuvier. 
,, odoyterygius, Cuvier. 
,, boscii, Lesson, Voyage de la Coquille, Zool., t. ii. 1, 1826, p. 288. 
„ forsteri, Lamarck. 
„ „ L., Quoy et Gaimard, Voyage de TAstrolabe, Moll., p. 279, pi. xxi. figs. 6-14. 
„ radiatus, d’Orb., Voy. aux lies Canaries, p. 42. 
1 Laniogerus elfortii, Blainville, Manuel de Malacol., 1825, p. 485, pi. xlvi. fig. 4. 
blainvillei, Goldfuss, Handb. d. Zool., 1820, Bd. i. p. 655. 
Glaucus atlanticus, F., Bergh, K. dansk. Vidensk. Selsk. Skrif. R. 5, Bd. vii. p. 253-285, 
Tah. vi., vii. 
One specimen was taken in the Atlantic (“ August to September 1875 ”) lat. 2° 34' N., 
long. 149° 9' W., at the surface, and another on May 5, 1876. The first specimen 
was small, measuring only 5 ’5 mm. in length, 2 ‘5 mm. in breadth, and 1‘6 mm. in height. 
1 Glaucus telrapterygius, which Rang (Man. del’hist. nat. d. Moll., p. 126) described as having “two pairs of gills,” 
is after all probably a doubtful species, as is also a form figured and described in the Mag. Nat. Hist., vol. vi., 1833, 
p. 318 (extract of the voyage of Mathews to and in Brazil). 
2 In a large treatise (Titius, Gemeinniitzige Abhandl. i., 1768, p. 271), Hanow, a professor in Dantzic, endeavoured 
to show that the animal described by Du Pont was the young of Squalus sguatina ! 
