10 
THE VOYAGE OF H.M.S. CHALLENGER. 
were always seen lying at the root of the tongue, between it and the inferior wall of the 
buccal cavity (fig. 1). Further backwards there were twenty-one or twenty -two 
fully developed and two incompletely developed series ; the total number of series of 
teeth was thus thirty-eight (forty -four) and forty (forty-nine) in the two individuals. 
Each of the teeth was provided with six or seven denticles on either side of the apex. 
The oral glands ( glandules ptyalince) were present and quite typical, but the true 
salivary glands {glandules salivales) were wanting. 
It is probable this species is circumsequatoral, and that Fiona jpinnata (Esch.) and Fiona 
longicauda (Quoy et Gaim.) will turn out to be identical with the common form of the 
Mediterranean and Atlantic. I have seen series of individuals from different parts of 
the Southern Ocean, as well as from the Japanese Sea, which in external characters and 
internal structure presented no differences from the typical form of the Atlantic. 
Glaucus, Forster.. 
Glaums, G. Forster, A Voyage round the World in the “ Resolution,” 1777, vol. i. p. 49. 
Eucliaris, Peron, Voy. de decouvertes aux terres australes, 1807-1810, pi. xxix. fig. 2. 
Dadone, Gistel, Naturgesch. des Thierreichs, 1848, p. 174. 
Laniogerus, Blainville, Manuel de Malacol., 1825, p. 485. 
Nausimacha, Gistel, Joe. cit., p. 174. 
Glaucus, F., Bergh, Anat. Bidr. til Ivundsk. om oEolidierne, K. dansk. Vidensk. Selsk. Skrif. 
R. 5, Naturv. og math. Afdel. vii., 1804, pp. 243-302, Taf. vi.-ix. 
„ F,, Bergh, Beitr. zur Kenntn. der Moll, des ■ Sargassomeeres, Verhandl. d. k. k. zool.- 
bot. Gesellsch. Wien., xxi., 1871, pp. 1300-1301. 
F., A. Vayssi&re, Observ. sur l’anat. du Glaucus, Ann. d. Sci. Nat., ser. 6, t. i., 1874, 
pp. 1-17, pi. viii., ix. 
Rhinophoria et tentacula fere ruclimentaria, simplicia. Truncus, prsesertim antice, 
quasi applanatus, lateribus tanquam brachiis duobus dilatatus, in quibus papillse Tin ea 
curvata (vel lineis) impositse ; in parte posteriore trunci utrinque prseterea series papil- 
larum duse obliquse. Cauda elongata. Poclarium sat angustum antice truncato-rotun- 
datum. 
Mandibulse validse, convexitate duplici, supera altiore et breviore, inferiore longiore ; 
mandibulse superne prseterea lamina horizontali prseditse ; processus masticatorius serie 
denticulorum armatus. Radula dentibus uniseriatis validis. 
Gians penis hamo curvato forti armata, vel inermis.. 
These animals were first scientifically examined by one of the best naturalists of the 
earlier part of the eighteenth century, F. Ph. Breyn. He captured numerous specimens in 
the Mediterranean close to the Island of Ivija, and sent a communication to the Royal 
Society 1 concerning these animals and some Porpitse which were obtained at the same time. 
1 De plantis et insectis quibusdam rariorihus, Phil. Trans., vol. xxiv., 1705, p. 2054, pi. ii. fig. 4 ; Ephem. Nat. Cur. 
Cent., vol«. v. and vi., 1717, App. pp. 104, 105, Taf. xiv. fig. 4. 
