. The sea-beach at ebb-tide : a guide to the study of the seaweeds and the lower animal life found between tidemarks . PLATE LVII. Porocidaris sharreri. Dorocidaris Blakei. Arbacia setosum. Strongylocentrotus franciscanus. SEA-URCHINS ±.:j FAMILY ECHINOMETIIIDJE v In this family the ambulacra! plates have several pairs of pores. GENUS Echinometra E. subffHf/tildiis. This species, which ranges from South Carolinato Brazil, and is also found in Bermuda, is common on mud-flats and iseasily distinguished by its oblong or elliptical shape. Its shell is aboutthree inches long in i
. The sea-beach at ebb-tide : a guide to the study of the seaweeds and the lower animal life found between tidemarks . PLATE LVII. Porocidaris sharreri. Dorocidaris Blakei. Arbacia setosum. Strongylocentrotus franciscanus. SEA-URCHINS ±.:j FAMILY ECHINOMETIIIDJE v In this family the ambulacra! plates have several pairs of pores. GENUS Echinometra E. subffHf/tildiis. This species, which ranges from South Carolinato Brazil, and is also found in Bermuda, is common on mud-flats and iseasily distinguished by its oblong or elliptical shape. Its shell is aboutthree inches long in its widest portion. The spines are one half of aninch to one inch long, thick at the base and tapering to a point. Thecolor is dark purplish-green to deep violet — almost black. GENUS Strongylocentrotus S. tlrobuch icnsis. This sea-urchin (which bears, perhaps, the longestname in technical nomenclature and has no other, unless that of sea-egg, which is applied indiscriminately to all sea-urchins) is a very com-mon species in shallow waters of the northern temperate zones. Itextends as far as New Jersey on the A
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmarinea, bookyear1901
