12 
THE VOYAGE OF H.M.S. CHALLENGER. 
found in the number of the journal for November 1787 1 ; a figure of Glaucus was 
published somewhat later in the “ Voyage .” 2 Another French zoologist, Bose, observed a 
similar form in the Atlantic, but described it as a Scyllcea . 3 A more extended account of 
the animal was given by the two naturalists who accompanied the South Sea Expedition of 
Captain Baudin. Bory cle St. Vincent left the expedition in 1802, and on his return pub- 
lished his Voyages aux quatres principals lies d’Afrique, which appeared in the year 1804 ; 
on pi. vi. fig. 1 a, b, of this work is a figure of a Glaucus, which seems to differ from Forster’s 
species, and was regarded by Lesson as identical with that described by Bose, to which 
the name Glaucus boscii had been given. Peron, the other companion of Baudin, also 
made some observations upon this animal, and had it figured by Lesueur. In his large 
work 4 he created for it the generic name Eucharis, but subsequently restored the original 
name of Glaucus . 5 The species which Peron described as new, under the name of Glaucus 
eucharis, Per ., 6 forms a part of the collection Glaucus hexapterygius of Cuvier. 
Other travellers : — Eschscholtz, Eang, Lesson, d’Orbigny, Quoy and Gaimard, and 
Souleyet, had frequently the opportunity of seeing these animals, nevertheless their 
descriptions as well as figures are nearly always valueless. Some malacologists have 
considered that all these descriptions refer to one and the same species (Lamarck, 
Blainville , 7 Quoy et Gaimard, Souleyet), others consider that there are no less than six 
(Lesson, Gray ). 8 
In 1864 the present author published a monograph of the genus, chiefly anatomical. 
Previously to this but little had been known about their structure, Cuvier 9 does not 
appear to have studied the anatomy of this form, since he places it near the Tritonise, and 
the notes of Blainville 10 are not of any real value. Quoy and Gaimard 11 made some observa- 
tions on the anatomy of Glaucus, and gave a description and figures of the jaws, penis, 
and spawn. Loven subsequently described the radula. 12 The first important description 
of the structure of Glaucus was given by Souleyet, 13 who clearly demonstrated its affinities 
with the TEolidiadse. 
1 Journ. dePhysique, t. xxx. 2, 1787, p. 366, pi. ii. fig. 5. 
2 Voyage de la Peyrouse, t. iv. p. 71, pi. xx. figs. 15-16. 
3 Bose, Hist. nat. des Vers, I. (an X.) p. 87, pi. iii. fig. 3. 
4 Voy. de decouvertes aux terres australes, 1807, 1810, pi. xxix. fig. 2. 
5 Blainville, Diet. d. Sei. Nat., t. xix., 1821, p. 37. 
6 Perhaps this species is identical with Glaucus australis of the same author, and thus with Glaucus per onii of Lesson. 
7 Mostly from notes made by Lesueur (Diet. d. Sei. Nat., loc. cit., p. 37). 
8 According to Gray (Guide to Moll, in Brit. Mus., part 1, 1857, p. 222) these species are radiatus, atlanticus, draco, 
forsteri eucharis, pacificus. The first two are identical, and form, together with Glaucus forsteri, the typical form Glaucus 
atlanticus. Glaucus eucharis of Lesson, from Mozambique Sea, is perhaps a separate species, as also the two species 
described by Eschscholtz from the Pacific, Glaucus draco and pacificus. 
9 Rkgne anirn., Ed. II., 1830, iii. p. 54. 
10 Diet. d. Sci. Nat., xix., 1821, pp. 35-37. 
11 Voy. de 1’ Astrolabe, Zool. Moll., 1833, pi. xxi. figs. 6-14. 
12 Ofversigt 7c. Vetenslc.-Alcad. Forhandl., 1847, p. 175(189 !), Tab. 3, Glaucus hexapterygius. 
13 Voyage de la Bonite, Zool., t. ii., 1852, pp. 440- 442, pi. xxiv. 
