[Pl. III fig. 11.]

As a sample of the shape of the surface of the eyes in this genus, we have given a figure, showing the small rounded lenses.

Chirurus ornatus Dalman.

[Pl. III figs. 12-14.]

The cephalic eyes have globular lenses, of more than double the size of those in Chir. clavifrons. The difference between the lenses and the surrounding shell amounts at the highest to thrice the former, while in Ch. clavifrons it is at least seven times as much. In a horizontal section the lenses have a little, darkish irregular nucleus surrounded by a radiated structure ([fig. 12]).

The maculæ ([fig. 14]) are slightly concave, oblong, smooth, surrounded by comparatively large granulations.

Chirurus speciosus Dalm.

[Pl. IV fig. 1.]

The exterior surface of the hypostoma is sparingly covered by granules of larger size than in other Chiruri. The maculæ as seen in a cast are prominent near the posterior border, sunk in their centre and surrounded by a narrow distinct border line. In a horizontal section it as not been possible to detect any peculiar structure, only a dark border surrounding the interior clear surface.

Chirurus spinulosus Nieczkowski.