Phylogeny of the Pelecypoda : the Aviculidae and their allies . es. Speci-men from Smithsonian Institution. X 50 diam., p. 372. Fig. 12. Mija arenaria, very young: p, prodissoconch, and well deflned succeiding dissoconch. Buzzards Bay, 1888. X 87 diam., p. 374. Fi. 13. Ml/a arenaria, older than flg. 12 : a prodissoconch, p, less clearly deflned than when younger, exists at theumbos. The dissoconch growth has acquired characteristics of the genus in form. A large active foot exists. Thesiphon consists of an extensible excurrent and a short non-extensible incurrent tube. Buzzards Bay. X 20 diara
Phylogeny of the Pelecypoda : the Aviculidae and their allies . es. Speci-men from Smithsonian Institution. X 50 diam., p. 372. Fig. 12. Mija arenaria, very young: p, prodissoconch, and well deflned succeiding dissoconch. Buzzards Bay, 1888. X 87 diam., p. 374. Fi. 13. Ml/a arenaria, older than flg. 12 : a prodissoconch, p, less clearly deflned than when younger, exists at theumbos. The dissoconch growth has acquired characteristics of the genus in form. A large active foot exists. Thesiphon consists of an extensible excurrent and a short non-extensible incurrent tube. Buzzards Bay. X 20 diara., p. 372. Fig. 14. Siphon of a young clam older than flg. 13. The massive siphon is fringed with tentacles. The incurrenttitbeis also bordered by tentacles, bnt the excurrent tube bears none; it is thin walled and retractile : s, border of shellfrom which the siphon extrudes. Chelsea Beach. X 10 diam., p. 373. Figs. 4 to 8 inclusive, and fig. 14 drawn by the author; all others drawn by Mr. J. H. Emerton. Memoirs Boston Sac, Nat. Hist., fful. IV. PLRTE LUX CO., e^GRaVERS A PRIMEftS, BOSTON. JilCKSDN. PHYLDEENY DF THE PELECYPaDil. Mamoirs Boston Soc. Nat, Hist., Vol, ITT. XXIV.
Size: 1355px × 1843px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, bookidphylogenyofp, bookyear1890
