MOLLUSCA AND SHELLS. +15 
"PLATE (39) 47 
Fig. 562. Myrtus (Modiola) AREOLATUS, lateral, and 562 a, 
dorsal views of the shell.—p. 452. 
Fig. 563. Myrtus (Modiola) HEPATICUS, side of the shell, ex- 
terior and interior, 563 a, dor sal view of the shell.—p. 454. 
Fig. 564. MYTILUS PYRIFORMIS, lateral, and 564 a, dorsal views 
of the shell.—p. 451. . 
. Fig. 565. MYTILUS DIVARICATUS, lateral, and 565 a, dorsal views 
of the shell.—p. 449. ! 
Fig. 566. MyriLUS ALGOSUS, lateral view of the shell, exterior 
and interior; 566 a, back of the shell.—p. 450. 
Fig. 567. MYTILUS TROSSULUS, lateral view of the shell, exterior 
and interior; 507 a, back of the shell.—p. 450. 
Fig. 568. GAIMARDIA TRAPESINA, lateral view of the shell and 
animal, 568 a, dorsal view of the shell, in outline; 568 b, ventral 
margin, showing the opening of the mouth; 568 c, the branchiæ ; 
568 d, the viscera; 568 e, two views of the foot; 568 J, the mouth 
and palpi.—p. 459. 
PLATE (40.) „2 
Fig. 569. PECTEN CAURINUS, the upper valve; 569 a, the lower 
valve; 569 b, edge view of the shell.—p. 458. > 
Fig. 570. PECTEN HERICIUS, the upper valve; 570 a, the lower. 
valve; 5700, edge view of the shell; 
upper valve. —p. 457. 
Fig. 571. PECTEN LATUS, the upper valve, exterior and interior, 
571 a, the lower valve; 571 5, details of sculpture.—p. 456. 
570 c, details of sculpture, 
PLATE 41.) 43 
Fig. 573. LIMA FRAGILIS, the three series of tentacles: (1) short 
and whitish, (2) medium length, pale, annulated with red, (3) 
long, red banded; 573a, edge view of the animal, showing the 
mantle, mottled with scarlet spots, a range of large ones next the 
shell, also part of the branchiæ and the scarlet body; 573 b, the 
opposite edge view, showing the branchie forced out, also the 
siphon and the adductor muscle; 573 c, tentacle, enlarged, with 
its annuli and colored bands; 573 d, branchia, showing its flow- 
ing, undulating character, crimped and folded like the letter W. 
Fig. 575. OSTREA MORDAX, group of shells; 575 a, interior of 
the lower valve; 575 b, inside of the upper valve. —p. 464. 
Fig. 576. OSTREA CIRCUMSUTA, exterior of an elongated speci- 
men; 576 a, interior of the lower valve of a rounded specimen ; 
576 b, upper valve of the same. —p. 462. 
Fig. 577. OSTREA GLOMERATA, a group of shells; 577 a, interior, 
and 577 b, exterior of a single specimen.—p. 461. 
PLATE (42) du 
Fig. 578. OSTREA DISCOIDEA, view of the exterior, and 578 a, 
interior of the upper valve; 578 b, exterior of the lower valve. 
—p. 463. 
Fig. 580. CRANIA RADIOSA, the upper, and 580 a, the under 
valve, enlarged; 580 b, edge view of the shell; 580 c, interior of 
the under valve; 580 d, slit for the tendon, magnified; 580 e, 
naiural size.—p. 460. 
Fig. 581. TEREBRATULA PULVINATA, lateral view of the shell, 
5810, edge of the shell, in outline; 581 c, details of sculpture, 
magnified; 581 d, and 581 e, views of the internal apophysis.—p. 
467. 
Fig. 582. TEREBRATULA CAURINA, lateral view of the shell, 582 
b, the shell, edgewise; 582 c, details of sculpture, magnified; 582 
d, and 582 e, views of the apophysis.—p. 468. 
Fig. 583. TEREBRATULA PATAGONICA, lateral view of the shell: 
583 b, edge view of the shell, in outline; 583 % details of sculp- 
ture, magnified.—p. 469. 
Fig. 584. CRENATULA PERGAMINEA, lateral, and 584 a, dorsal 
views of the shell, 584 b, the hinge.—p. 447. 
Fig. 585. der es (Modiolarca) PUSILLUS, lateral, 585 a, dorsal, 
and 585 b, hinge views of the shell, enlarged; 585 c, natural size. 
—p. 455. 
Fig. 586. EnvorxA (Kellia) QUADRATA, lateral, and 586 a, dorsal 
views of the shell; 586 b, the hinge, magnified ; 586 c, natural 
size.—p. 402. 
Fig. 587. ERYCINA (Poronin) OVATA, lateral, and 587 a, dorsal 
views of the shell, enlarged; 587 b, the hinge, magnified ; 587 c, 
natural size.—p. 401. 
E 
PLATEGS) US 
Fig. 585*. ARGONAUTA GENICULATA, lateral view of the animal; 
985 a, dorsal view of the animal; 5850, the mouth and circle of 
arms, and the origin of the series of cupules; 585 c, the jaws; 
585 d, arrangement of the cupules where they diverge; 585 e, 
two cupules, magnified ; 585 f, joint of veliferous tentacles, inner 
surface.—p. 4'/0. 
Fig. 586*, Octopus MEGALOCYATHUS, dorsal, and 586 a, ventral 
views of the animal, reduced; 5865, mouth and circle of arms, 
with the arrangement of the cupules; 586 c, a cupule from above; 
980 d, lateral view of a cupule.—p. 471. 
PLATE (44.) 4b 
Fig. 587*. OCTOPUS MIMUS, dorsal, and 587 «, ventral views of 
the animal, 587 b, mouth, and circle of arms; 587 c, the mouth 
and jaws; 587 d, a cupule, in profile; 587 e, cupule, seen from 
above.—p. 473. 2 
PLATE 45.) 47 
Fig. 588. Ocrorus TETRICUS, dorsal view of the animal; 588 a, 
ventral view; 588 b, face of a cupule; 588 c, interior of a cupule , 
588 d, profile view of a cupule.—p. 474. 
Fig. 589. Octopus FURVUS, dorsal, and 589 a, ventral views of 
the animal; 589 2, cupule, seen from above; 589 c, profile of a 
cupule.—p. 475. 
PLATE C6 o 
Fig. 590. OCTOPUS ORNATUS, dorsal view of the animal; 590 a, 
ventral view, showing the interior of the umbrella and the mouth ; 
990 b, cupule, from above; 590 c, cupule, in profile.—p. 476. 
Fig. 591. Octopus PUSILLUS, dorsal view of the animal, natural 
size; 591 a, the umbrella and mouth; 5910, the abdomen and 
respiratory sac.—p. 478. 
Fig. 592. Ocrorus MOLLIS, dorsal view of the animal, natural 
size, 592 a, the umbrella and mouth, 592 0, ventral view of the 
body.—p. 479. 
