Report on the zoological collections made in the Indo-Pacific Ocean ...

MOLLUSCA. 95sulci cutting across them. The margiu of the valves within is denticulateeverywhere except down the posterior dorsal slope, thedenticles on the edge of the lunulc heing tiner and closer togetherthan elsewhere. The pallial hne is posteriorly nearly straight, oreven a little inmrved just helbre the commencement of the sinus,which is rather deep. The interior is generally somewhat rosy,especially towards the heaks.8. Cytherea (Caryatis) coxeni. (Plate VII. figs. A-A2.)Shell small, inequilateral, subtrigonally oval, white, variegatedwith pale zigzag brown or reddish lines forming an irregular brokenupnetwork. Anterior dorsal margin straightish, much descending,sharply curving at the end into the upturned ventral outline.Posterior slope much loTiger, somewhat arcuate and less oblique thanthe anterior. Hinder extremity produced, roundly acuminated.Lower margin widely curved, about equally ascending at both ends.Umbones small, well curved over towards the front. Lunule longishheart-shaped, a little sunken, slightly elevated along the middle,and defined bj- an impressed line. Area indistinct. Surface of thevalves finely sulcate-striated, the intervening lir