394: ROBERT TRACY JACKSON ON THE 



44. Lankester, E. Ray. Mollusca. Encyclopsedia Britannica, Ninth Edition. 1883. 



45. Lea, Isa^vc. Observations on the Genus Unio, Vol. vi. I'liilaUelpliia, 1857. 



46. Lovfix, S. Bidrai: till Kaunedomen om utvecklingeu aC Jlollusca .Vcephala Lamellibranchiata. Kongl. Vetenskaps 



Akademiens Handlingor. Stockholm, 1848. Translated into Oernian in Archiv f iir Naturgeschichte, Vol. xv, i, 1849. 

 A German reprint with plates was also published by Professor Lovfin, in 1879. 



47. MiTzuKuni, K . Structure and Siicniflcance of some Aberrant Forms of Lamellibranchiate Gills. Quart. Journ. Mic. 



Sc. , 1881. Repriuted in Johns Hopkins Biol. Lab. Studies, Vol. ii, 1883. 



48. Morse, Edwaud S. On the Relations of Anomia. Proc. Bost. Soc. Nat. Hist., Vol. xv, 1870-71. 



49. d'Orbigny, a. Pal6ontologie Francaise, T. 3 et T. 4. 1843-47. 



50. Owen, Richard. Structure of the Shell in the Water Clam (Spondylus varius).- Proc. Zool. Soc, Vol. v, 1837. 



51. On the Relative Positions to their Constructors of the Chambered Shells of Cephalopods. Proc. Zool. Soc, 



1878. 



52. Patten, W. The Embryology of Patella. Arbeit. Zool. Inst. Wien. B. vi, 1886. 



53. Eyes of Molluscs and Arthropods. Mittheilung d. Zool. Station zur Neapel, B. vi, 1885-6. 



64. Peck, U. Holman. The Structure of the Lamellibranchiate Gill. Quart. Journ. Mic. Sc, 1877. 



55. PiCTET, F. J. Mollnsques Fossiles de Geneve. 



56. Pdudie, Alex. The Anatomy of the Common Mussels. Colonial Museum and Geol. Survey Dept., Wellington, New 



Zealand, 1887. 



57. R.uiL, C. Ueber die Entwickeluugsgeschichte der Malermuschel. Jeuaische Zeitschr., Vol. x, 1876. 



58. Reeve, L. A. Conchologica Iconica, London. 



59. Reicbel, L. Ueber das Byssusorgau der Lamellibranchiaten. Zool. .\nz., x. pp. 488-490. 



60. Ryder, John A. An Account of Experiments in Oyster Culture and Observations Relating thereto. Rep. Maryland 



Fish Comm., 1881. 



61. The Microscopic Sexual Characteristics of the American, Portuguese and Common Edible Oyster of Europe 



Compared. Bull. U. S. Fish Comm., Vol. u, 1882. 



62. ( )u the Mode of Fixation of the Fry of the Oyster. Bull. U. S. Fish Comm., Vol. u, 1882. 



63. On the Metamorphosis and Post-larval Stages of Development of the Oyster. Rep. U. S. Fish Comm , for 



1882. Washington, 1884. 



04. A Sketch of the Life-history of the Oyster. Published in Dr. C. A White's Monograph (this list. No. 73). 



65. A Contribution to the Life-history of the Oyster, in "The Fisheries and Fishery Industry of the United 



States." Section 1, 1884, pp. 711-758. 



06. The Byssus of the Young of the Common Clam (Mya arenaria, L.). Am. Nat., Jan., 1889. 



67. Sharp, Benj.v-Min. Remarks on the Phylogeny of the Lamellil)ranchiata. Proc. Acad. Nat. Sc. Phil., 1888. 



68. ScHMLDT, Ferdinand. Beitrag zur Kentniss der Postembryonalen Entwickelung der Najaden. Archiv fiir Naturge- 



schichte, LI, B. I, 1885. 



69. SowERBY, G. B. The Genera of Recent and Fossil Shells. Loudon, 1821-26. 



70. Stoliczka, Ferd. Cretaceous Pelecypoda of Southern India. Mem. Geol. Survey of India, 1S71. 



71. Tryon, George W., Jr. Structural and Systematic Conchology. Philadelphia, 1882. 



72. Verrill, a. E. Invertebrate Animals of Vineyard Sound, etc. Rep. U. S. Fish. Comm. for 1871-72. 



73. AVhite, C. a. a Review of the Fossil Ostreid* of North America. Rep. U. S. Geol. Survey, iv, 1884. 



74. . On Mesozoic Fossils. Bull. U. S. Geol. Survey, 1884. 



75. Whitfield, Robeut P. Brachiopoda and Lamellibranchiata of the Raritan Clays and Greensand Marls of New Jer- 



sey. Monogr. U. S. Geol. Survey, 1885. 



76. WiNSLOw, FiiANCis. An Account of an Experiment in Artificially Fertilizing the Ova of the European Oyster. 



Rep. (— ) Maryland Fish Comm., 1881. 



77. Woodward, Henry. On the Structure of Camerated Shells. Pop. Sc. Rev., Vol. xi, April, 1872. 



78. Woodward, S. P. Some Account of Barretia. The Geologist, Oct , 1882. 



79. Manual of the Mollusca. Fourth edition, by Ralph Tate, London, 1880. 



80. ZiEGLKR, H. Ernst. Die Entwicklung von Cyclas cornea. Lam. Zeitschr. fiir wissensch. Zool., Vol. XLi, 1885. 



81. ZirTEL, Kaul a. Traite de Paleoutologie. Translation by Dr. Charles Barrois, 1887. 



XVIII. EXPLANATION OF PL.\TES. 



The figures which illustrate this paper were drawn by Mr. J. II. Emerton or the author, with a few exceptions which 

 are noted in the descriptions. All figures of microscopic material were either drawn directly from specimens with the aid 

 of a Zeiss camera lucida, or were redrawn from camera drawings. The locality and date of collecting specimens are in- 

 dicated in the description of figures excepting cases where those facts are given in the text. The magnification of 

 figures and the principal references to the pages In the text where the figures are described or discussed are given as an 

 aid to readers. Specimens figured in the plates or text, unless otherwise mentioned , are in the collection of the author. 

 I have to thank Mr. Emerton for the pains he has taken in drawing the figures which largely illustrate this paper. 



