MILAX GAGATES. 141 
arises from the convex side of the epiphallus, and is fixed to the oviduct ; SPERMA- 
THECA large and globose when fully distended, connected laterally to the oviduet by 
A 
Fic. 160. Fic. 161. Fic. 162. 
Fic. 160.—Alimentary tract of W/ilax gagates, showing the buccal bulb and nerve-ring, x 2 
Fic. 161.—Sexual organs of JZ. gagates, x 3, the accessory glands turned aside to show the 
protuberant atrium. a/é.g7. albumen gland ; o#. ovotestis; sf. spermatheca; #.s. penis-sheath; 
ep. epiphallus; 7. retractor; g¢. accessory glands. 
Fic. 162.—Cephalic retractors of 17. gagates, Xx 8. 
tissue and more firmly at the apex; its short, stout stem opens into the free-oviduct, 
at whose junction with the atrium are large foliated accessory glands with long 
ducts, resembling salivary glands in their whiteness and lobular form. 
The CEPHALIC RETRACTOR is somewhat variable in its development ; it usually 
arises from the dorsum from a single root, and is often attached to, or beneath, 
the apex of the shell, travelling a short distance as a single band; occasionally the 
PHARYNGEAL and TENTACULAR portions may arise independently, e each from its 
own base or root, but these are always closely contiguous; the pharyngeal muscle 
is invariably deeply cleft, and the retractor of the right tentacle does not separate 
the male and female organs, as in the typical. eh 
Limaces. 
MANDIBLE or jaw moderately arcuate, thick, and 
of a deepish horn colour, with very fine strize on the re 
anterior surface; ends bluntly rounded; median beak Fic. 163.—Mandible or jaw of 
or rostrum not prominent and very obtuse. Milax gagates, X 12. 
The LINGUAL MEMBRANE is of the usual shape, and in a Christchurch specimen 
displays series of closely-set teeth, projecting forward in the centre and sloping 
backward towards the margins; the median series of teeth are slightly smaller than 
the neighbouring laterals, and are distinctly tricuspid with the mesocone strong and 
EKIGIOD 
Fic. 164.—Representative denticles from a transverse row of the lingual teeth of 47. gagates, X 180. 
The animal collected at Christchurch by Mr. C. Ashford, and the palate prepared by Mr. J. W. Neville. 
well developed; the laterals are also clearly tricuspid, the mesocone gradually 
increasing in strength and importance ; the marginals are chiefly bicuspid, showing 
a strong mesocone and distinct ectocone, the endocone so well dev eloped on the 
lateral teeth havi ing become gradually lost, while the extreme marginals are simply 
aculeate. 
The formula of a Christchureh ieeen is 
ey tFtt44 7445 x 98 = 7,938. 
Reproduction and Bey ieean ln: congress of this species may 
take place at any period of the year, during mild weather, and as is indi- 
cated by the presence of a well-developed excitatory organ within the 
38 
30 
