34 
THE VOYAGE OF H.M.S. CHALLENGER. 
The hermaphrodite gland is made up of six distinct lobes ; three are situated posteriorly 
(the hindermost is somewhat larger than the other two), two median lobes are situated 
under the posterior liver, and an anterior just at the hinder end of the anterior genital 
mass. This last large one measures about 7 mm. ; the ampulla of the hermaphrodite duct 
is dirty yellow, somewhat sausage-shaped, it is bent upon itself, and when straight it 
measures about 15 mm.; the penis is conical, about 2 - 5 mm. long, the glans nearly fills 
the prseputium (PL XI. fig. 20, b ) ; the spermatheca is of the usual small size ; the mucous 
gland is whitish, the albuminiparous gland brownish in colour. 
Bornella, Gray. 
Bornellci , Gray, Figures of molluscous animals, vol. iv., 1850, p. 107. 
„ „ Bergli, Malacolog. Untersucli. (in Semper, Reisen im Arcliip. cl. Philipp., Th. II. 
Bd. ii.), Heft vii., 1874, p. 287-308, Taf. xxxvi.-xxxviii. 
Corpus compressum. Tentacula breve peclicellata, e conis vel cylindris humilibus 
seriebus curvatis dispositis formata. Rhinophoria papillis dorsalibus anticis quasi 
connata ; vagina rhinophorialis margine digitato, clavus perfoliatus. Margo dorsalis 
utrinque papillis fortioribus, apice digitatis, infra branchiferis continuatus ; branchiae 
compositae, externae et internae, externae saepius appendicibus simplicibus defensae. 
Anus latero-dorsalis. Podarium angustius, antice rotundatum. 
Armatura labialis peculiaris, quasi squamosa. Mandibulae fortiores, compressae. 
Radula dentibus medianis fortioribus, margine laevi vel denticulato ; dentibus lateralibus 
compluribus corpore elongato, hamo obliquo, elongato, margine laevi. — Ventriculus 
secundus spinis seriatis armatus.- Penis annulo spinarum armatus. 
The genus Bornella was created by Gray in 1850, from a specimen brought back by 
H. and A. Adams, who accompanied the expedition of the “ Samarang,” or perhaps from 
the figure of the animal given by these authors. 1 About the same tune (1848 or 1850) 
the genus was a little more fully described by Adams and Reeve, 2 the description in 
“ Gray’s Guide ” being indeed hardly sufficient for recognition of the animal. Hancock 
(1864, 1866) made considerable addition to our knowledge of this genus which a few 
years later (1874) was described by me in detail in my monograph. 
These animals agree in their outward form with the Dendronotidse, being, like them, 
compressed. At the front are the peculiar tentacles which are provided with a short 
stalk ; this has a number of short conical or cylindrical projections arranged in two 
rows. The rhinophoria are fused throughout their whole length with a process which 
extends beyond them, and is like one of the dorsal papillae. The sheath of the rhino- 
phorium is divided above into finger-shaped branches; the club being strongly perfoliated. 
1 Bergh, loc. . cit ., p. 287, notes 2, 3. 
2 Bergh, loc. cit., p. 287, note 3. 
