. The sea-beach at ebb-tide : a guide to the study of the seaweeds and the lower animal life found between tidemarks . sts, but those most likelyto be encountered are the following: GENUS Dendronotus I), arborescens. This species is about one inch long and variablein color, but is usually reddish-brown or rose. There are no tentacles,bul in their place are two antler-like appendages pointing forward andbranched like a tree. All alonir the back are two rows of curiouslybranched processes, which ^ive to the animal the appear/nice of a cerata, or dorsal papilla, are delicately
. The sea-beach at ebb-tide : a guide to the study of the seaweeds and the lower animal life found between tidemarks . sts, but those most likelyto be encountered are the following: GENUS Dendronotus I), arborescens. This species is about one inch long and variablein color, but is usually reddish-brown or rose. There are no tentacles,bul in their place are two antler-like appendages pointing forward andbranched like a tree. All alonir the back are two rows of curiouslybranched processes, which ^ive to the animal the appear/nice of a cerata, or dorsal papilla, are delicately transparent, contractile,and richly colored. The function of these papilla is not fully the animal has no specialized breathing-organs, it is reasonable tosuppo>e that respiration is carried on through the outer skin and per-haps all over the surface of these branched papilla-. The liver, which28 354 MARINE INVERTEBRATES in most nudibranchs is extremely large and completely surrounds thestomach, in Dendronotus also extends into these dorsal cerata, so thatthey may have some sort of digestive Dendronotus arborescens. GENUS JEolis IE. papillosa. This is probably the commonest nudibranch uponthe North Atlantic coast, and it occurs as frequently in Europeanwaters. It may readily be found clinging to stones, algae, the piling ofwharves, eel-grass, etc., in bays or in rocky tide-^ools. The color isyellowish-gray to oiange, with purplish or olivespots. The cerata are very numerous, and cover thedorsal portion of the animal save for an open spacealong the middle of the back. There are two sets oftentacles, the two dorsal and the two simple labialtentacles. The foot tapers behind to a sharp point,and is truncate in front. As in Dendronotus, theliver is diffused into the cerata, which in ^Eolis aresimple tubular processes without the branchingcharacter of those of the former. Both species laytheir eggs in a gelatinous, bobbin-like cord, whichis hung in festoons ove
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmarinea, bookyear1901
