28 



THE NAUTILUS. 



1851 — Schmidt, Ueber die Entwicklung von Cyclas calyculata. 

 Mii Hers Archiv. 



1855 — Leidig, Anatomieund Entwicklungsgeschichte von Cyclas. 

 Miillers Archiv. 



1865 — Stepanoff, Ueber die Geschlechtorgane und die Entwick- 

 lung von Cyclas cornea. Archiv fur Naturgeschichte, 31 

 Jahrg., Bd. 1. 



1885 — Ziegler, Die Entwicklung von Cyclas cornea. Zeitschrift 



fiir wissenschaftliche Zoologie, Bd. XLL 

 1895 — Drew, The Anatomy of Sphaerium sulcatum. Proceed- 

 ings of Iowa Academy of Sciences. Vol. III. 

 1895 — Cook, Molluscs, Cambridge Natural History, Vol. III. 

 1898 — De Bruyne, Sur 1' intervention de la phagocytose dans le 

 developpement des Invertebres — Archives de Biologie, 



1903 — Ridewood, On the Structure of the G ills of the Lamelli- 



branchia. Philosophical Transactions, Vol. CXCV, B. 

 1906 — Lankester, Treatise on Zoology, Part V. 



1910 — Po}'arkorT, Incubation des embryons et regeneration des 

 branchies chez les Cyclas. Archives de Zoologie Ex- 

 perimental, P. V. 



1911 — Schereschewsky, Struktur und Bildung der Bruttaschen 

 bei Cyclas cornea. Zeitschrift fur wissenschaftliche 

 Zoologie, Bd. 98. 



1913 — Isely, Experimental Stud}' on the Growth and Migration 

 of Fresh Water Mussels. Abstract in Science 1913, P. 



Plate IV. Figure 1. A diagrammatic dissection of Calyculina. 



P. XV. 



263. 



EXPLANATION OF PLATES IV-VL 



M —Mouth 



hp — Labial palps 



Es — Esophagus 



Lv — Liver 



Sto — Stomach 



Int — Intestine 



R — Rectum 



A — Anus 



Cb G — Cerebral ganglion 



Ps G — Parieto-splanchnic 



K 0 — Kidney opening 



T — Sperm follicles 



0 —Egg follicles 



G D —Genital duct 



G 0 — Genital opening 



A A — Anterior adductor 



muscle 



PA — Posterior adductor 



muscle 



ganglion 

 P G — Pedal ganglion 



Ft —Foot 



CI Ch — Cloacal chamber 



Ex S — Excurrent siphon 



