. The sea-beach at ebb-tide : a guide to the study of the seaweeds and the lower animal life found between tidemarks . deprcssiis, Xcopnnopeustexatut, Rhitfwopanopeus lian-isii (Mary J. Rathbun). These fourspecies, formerly all called Panopeus,are small crabs which live in the mudand are commonly known as mud-crabs. They are abundant under stonesin muddy places, and occur on theAtlantic coast from Massachusetts Bayto Florida, though they are not com-monly met with north of New hcrbstii is the largest oneof the group, some of the Southernones measuring two inches is
. The sea-beach at ebb-tide : a guide to the study of the seaweeds and the lower animal life found between tidemarks . deprcssiis, Xcopnnopeustexatut, Rhitfwopanopeus lian-isii (Mary J. Rathbun). These fourspecies, formerly all called Panopeus,are small crabs which live in the mudand are commonly known as mud-crabs. They are abundant under stonesin muddy places, and occur on theAtlantic coast from Massachusetts Bayto Florida, though they are not com-monly met with north of New hcrbstii is the largest oneof the group, some of the Southernones measuring two inches is found living in mud at low-watermark, or burrowing in banks nearhigh-tide mark. It is dark olive-brown, the claws broadly tipped withblack. Eurypanopeus depresses is flat-tened above, and is smaller than Neo-panopeus texana, which is somewhatconvex above. The last two are com-monly found together and have similar habits. Rhithropanopeuslives near high-water mark and also in salt-marshes, and is comparativelyrare. The claws lack the dark tips of E. herbstii, and a distinct groovefollows the edge of the KiiriilHiiiniii i/.s ili-/n-, the mud-crab ; male,natural size. FAMILY GRAPSIDJEGENUS II. nn(ltt* C\l;iry .1. Rathbun). .Heferogrrapsws muftis (Stimpson); (Mary J. Rathbun), H</ rapSUS orctjoitciisis (Stimp- son). These two species, commonly called respectively! he /nle shore-craband the yellow shore-crab, &Te the most abundant species of the Californiacoast. Hundreds may be found congregated under a single rock. Theyrange from Sitka to Lower California. //. «reij»n< //.v/\ literally swarms insloughs of salt or brackish water, and hundreds of uplifted threateningclaws confront the intruder who ventures on these mud-Mats when thetide is out. This species, the yellow shore-crab, has a nearly squarebody. The anterior half of the side margins has two rather deep indenta- 282 MARINE INVERTEBRATES tions, making two spine-like projections wh
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmarinea, bookyear1901
