Marseniidæ (marseniide)

pl. [NL., truncate head with tentacles rising from its angles, eyes se ile at the outer base of the tentacles, and the teeth the radula in three or seven rows. The rachidian tooth has a recurved uni cuspid or denticulate apex. The shell is small and mostly entirely internal. The species inhabit all seas, and nearly 40 of them are known. Most, if not all, bore holes in ascidians and sponges to deposit their ova, and then cover the holes with special lids. Nearly all are diœcio us, but a few are monœcio us or hermaphrodite. Also called Marseniadæ, Lamellariidæ. marsenioid (mär-sēʼni-oid), a. and n. [ 3639 water, but generally no vegetation. Slough, quagmire, and swamp are the most suggestive of sinking in the mire. Swamp is rather broad in meaning; trees of certain kinds grow in swamps, but there is too much water to allow of agriculture or pasturage. In the United States, however, swamp is often used in the restricted sense of 'fresh-water marsh.' A marsh is frequently or periodically very wet, as the salt- marshes that are soaked by high tides; it may or may not be able to produce marsh - gra or small trees. A mora is the worst kind of marsh, large and too wet for valuable productivene . A fen is a marsh abounding in coarse vegetation; a moor may or may not be wet, its distinguishing mark being the absence of forests. Fen and moor are little used in the United States. marshalship each end by heads of slightly conical form, sable.- Provost marshal. See provost.