. Bulletin - New York State Museum. Fig. 14 Libiniaemarginata (After Rathbun) L . e m a r g i n a t a may be distinguished from L . d u b i a bythe greater number of spines on the carapace and by the medianrow, consisting in the former of nine, and in the latter of six Fig. 15 Libinia du bia (After Rathbun) Both Species occur, the former the more commonly, walking overthe bottoms of the shallow bays among the eelgrass, and they extendout into deeper water. They are frequently dredged on the oysterbeds, and sometimes appear in such numbers that operations haveto be suspended till the s
. Bulletin - New York State Museum. Fig. 14 Libiniaemarginata (After Rathbun) L . e m a r g i n a t a may be distinguished from L . d u b i a bythe greater number of spines on the carapace and by the medianrow, consisting in the former of nine, and in the latter of six Fig. 15 Libinia du bia (After Rathbun) Both Species occur, the former the more commonly, walking overthe bottoms of the shallow bays among the eelgrass, and they extendout into deeper water. They are frequently dredged on the oysterbeds, and sometimes appear in such numbers that operations haveto be suspended till the spiders, as the fishermen call them, havepassed over. IIICIIKR CRUSTACEA OF NEW YORK CITY I47 Thev are slow moving animals, and their carapaces are notinfrecjuentlv so covered with foreign niatter, such as worm tubes,living hvdroids and algae, that it is difficult to distinguish themfrom their surroundings. One crab taken had the entire body cov-ered with a soft velvety-looking mass of the hydroid Hydractinia,which occurs on the hermit crabs. Members of this family havebeen observed sticking bits of algae, hydroids etc. on bare spots ofthe carapace with their pincers. Length 4-6 cm. Occurs along the shore in the bays. The tribe Oxystomata is not represented in New York.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectscience, bookyear1887
