. The sea-beach at ebb-tide : a guide to the study of the seaweeds and the lower animal life found between tidemarks . tww .«//,»/». tii,> oyster-crab; lues MI My/flw*«fe*Zw(mnssel)andinthe enlarged four diameters. smooth scallop, Pecten magellanicus. Ihe oy-tei-crab is a true messmate, and iis presence in the oyster may be ad-vantageous in helping to provide food for its host. This crab, like the rest,holds its eggs in tlie posterior feet until hatched, when the larva leave theparent and suim about fora while. The females, at the megalops stage. enter oysters sometimes two enter the >an
. The sea-beach at ebb-tide : a guide to the study of the seaweeds and the lower animal life found between tidemarks . tww .«//,»/». tii,> oyster-crab; lues MI My/flw*«fe*Zw(mnssel)andinthe enlarged four diameters. smooth scallop, Pecten magellanicus. Ihe oy-tei-crab is a true messmate, and iis presence in the oyster may be ad-vantageous in helping to provide food for its host. This crab, like the rest,holds its eggs in tlie posterior feet until hatched, when the larva leave theparent and suim about fora while. The females, at the megalops stage. enter oysters sometimes two enter the >an yster, but seldom more than one; there it remains permanently, growing to the si/.e of an inchor more in diameter, and becomes a degenerate. The eyes becomesmaller ; the shell never hardens, like its allies which live in open water ;its limbs and chela are weak ; and it has no pugnacity, the protectionafforded by the oyster do]nir away with the need for the common protec-tive features of its kind. /</r/<n, a related species, lives inthe tubes of larue annelid worms as a 288 MARINE INVERTEBRATES ORDER STOMATOPODA GENUS Squilla S. empusa. This animal suggests somewhat the lobster, though veryunlike it. The carapace is much smaller and softer, and leaves the lastthree segments of the thorax uncovered. The abdomen is larger and longer in proportion, while the legsand organs are quite whole body is depressed, in-stead of laterally compressed. Itmeasures from eight to ten inchesin length and two iuchesin of chelae, the last joint of thegreat claw has six sharp curvedspines, which fit into sockets in agroove on the second joint. Bythis singular organ they hold theirprey securely. The abdominalfeet carry the gills. The antennalscales are oblong and fringed withhair. The antennules terminatein three flagella. The caudal ap-pendages and telson are long,strong, and armed with animal lives in burrows intike mud below
Size: 2066px × 1209px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectmarinea, bookyear1901
