438 
bulletin of the bureau of FISHERIES. 
8. Lacaze-Duthiers. 
Memoire sur le developpement des branchies des mollusques acephales lamellibranches. Annales 
des Sciences Naturelles, Zoologie, ser. 4, t. 5, 1856. 
9. MenEgaux, A. 
Recherches sur la circulation dans les lamellibranches marines. Besanfon, 1890, 291 p., 56 fig. 
10. Mitra, S. B. 
The crystalline style of Lamellibranchia. Quarterly Journal of Microscopical Science, vol. 44, 
1901, p. 591-602. 
11. PELSENEER, P. 
Contribution letude des lamellibranches. Archives de Biologie, t. xi, 1891, p. 147-312, 2 fig., 
pi. 6-23. 
12. Peck, R. H. 
The minute structure of the gills of lamellibranch Mollusca. Quarterly Journal of Microscopical 
Science, vol. xvn, 1877, p. 43-66, pi. iv-vii. 
13. Rice, E. L. 
Fusion of filaments in the lamellibranch gill. Biological Bulletin, vol. 11, 1900, no. 2, p. 71-80, 
text fig. 1-8. 
14. Stenta, M. 
Zur Kenntniss der Stromungen im Mantelraum der Lamellibranchiaten. Arbeiten aus den 
Zoologischen Institut der Wien, bd. 14, 1903, p. 211-240, 2 fig., taf. 
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Ueber Anomia. Zeitschrift fur wissenschaftliche Zoologie, bd. 30, sup. hft. 1, p. 13-27, pi 11. 
EXPLANATION OF PLATES. 
PRATE xlviii. 
Fig. 16. Drawing of a specimen natural size to show the relative position and appearance of the vari- 
ous organs. One shell valve, one mantle lobe, and the posterior half of the gills of one side have been 
removed. P A, posterior adductor; A, anterior adductor; C, posterior retractor of the foot; P, palps; 
G, gill; F, foot; B, byssus; M, mantle gland; R, rectum; K, the portion of the kidney which commu- 
nicates with the pericardium; T, testis; D, ciliated canal of the mantle which carries debris from the 
mantle chamber. 
PLATE XLIX. 
Fig. 17. Drawing of the arteries of the right side of the body and of the left mantle lobe, the shell, 
right mantle lobe, gills, and kidneyshaving been removed, h, heart; t, tube which carries the blood from 
the gills to the auricle, here shown cut off just below the auricle; v, anterior aorta; p, posterior aorta; 
m, mantle artery; g, cerebral and pedal ganglia; op, and ip, arteries to the outer and inner palps, 
respectively. 
Fig. 18. Drawing of the arteries of the left side of the body, the shell, left mantle, gills, posterior 
retractor muscles of the foot and kidneys having been removed; m, visceral mass; o, artery to the 
retractor muscles which have been removed. The distribution of the other arteries is easily made out 
in the drawing. Only the main trunk of the mantle arteries is shown here, but they are similar to those 
represented in figure 17. 
Fig. 19. Drawing of the principal veins of the right side of the body, the shell, right mantle lobe, and 
gills having been removed, pr, posterior retractor muscle of the foot; ar, anterior retractor of the foot; v, 
the large venous trunk which enters the kidney and breaks up into capillarise; 1,2, and 3, veins from 
the foot and byssal apparatus, they receive blood from a large sinus which lies just at the base of the 
foot; k, the vein which gathers the blood from the kidney and carries it to the gills. It is here shown 
cut off at the point where it entered the gills. 
