REPOET ON THE NTJDIBRAN CHI ATA. 
87 
The eyes (fig. 1) have coal-black pigment, with a chitinous-yellow lens ; the optic nerves 
about half as long again as the eyes, one of them was pigmented black throughout its 
whole length, and there is a small ganglion opticum at the base of each nerve. The 
otocysts are spherical, rather larger than the eyes, and closely filled with from 
200 to 300 of the usual otoconia. The leaves of the rhinophores are stiffened by (fig. 
3) greatly hardened long spicules, which amount to ’035 mm. in diameter ; there are a 
very great number of large spicules in the axis of the club, and in the stalk almost 
displacing the other tissue. The dorsal papillae are rendered extremely stiff (fig. 2) by the 
spicules penetrating them, which are also present everywhere in the skin. These spicules, 
as well as those already mentioned, are usually very much hardened, very long, usually 
pointed at both ends, the surface being almost or perfectly even. There were commonly 
only a few hardened cells spread in the interstitial connective tissue, but there were 
besides some spicules spread around the efferent ducts of the anterior genital mass. 
The very strong buccal tube was 6 mm. long; the three pairs of retractors the 
same as usual ; the inside with the usual posterior circular and longitudinal folds. 
The very strong bulbus pharyngeus 8 mm. long, 6 '5 mm. high, and 6 mm. broad; the 
sheath of the radula projecting downwards 3 ‘8 mm. at the posterior end ; the retractors and 
the structure of the bulbus on the whole much as usual. The labial disk covered with a 
strong soft cuticle ; the buccal opening as usual. The tongue broad and powerful, the 
deep broad cleft and the margins of its contiguous parts covered by the pale chitinous-yellow 
radula. In the latter there were twelve rows of dental plates, of which the first four were 
more or less incomplete; eleven developed rows and four still imperfect rows lie, moreover, 
under the strong roof of the radula and in its thick sheath ; the total number of the rows 
amounted to twenty-seven. There were thirty-eight dental plates (on each side) in the 
first complete, the fifth, row of the tongue, and the number seemed only to increase at 
most to two or three more towards the back. The colour of the plates was a pale chitinous- 
yellow. The length of the innermost plate on the hindermost part of the tongue came to *2 
mm., and the height of the hook to - 12 mm. The length of the plates amounted to about 
•53 mm., and the height of the hook to about *32 mm. The length of the outermost 
plate amounted to ’14 mm., the height to *08 mm.; the length of the next plate to ’18 mm. 
with a height of H4 mm.; the length and height of the following plate respectively ‘25 
mm. and ‘25 mm. The plates were of the usual form, with the usual wing-shaped 
development of the body (figs. 4-9) ; the inner as usual being smaller, with proportionately 
thicker hook (figs. 4-7), the outer (fig. 9) with more slender hook and shorter body. 
The salivary glands are yellowish-white, flattened, bent together in the middle, when 
extended about 1’5 cm. long, the right gland not reaching so far back as the left; the 
anterior half thinner, amounting hardly to one-third the diameter of the posterior half ; 
the anterior part narrow, and gradually passing into the excretory duct ; the posterior 
half about 3 mm. in breadth by 75-1 ’2 mm. in thickness. The oesophagus is neariy 
