LIVING BRACHIOPODA. 385 



Fig. 7. Stomach, stomachal glands, and right occUisor muscle of D. lamellosa with ilio-parietal band turned forward to 

 show ovaries arising from it. 



Fig. y. Greatly enlarged view of ilio-parietal band from above; figure showing proliferation of genital strands with eggs 

 in masses. 



Fig. !i. A group of eggs attached to genital strand, idem. 



Fig. 10. A group of eggs attached to genital strand, greatly enlarged, idem. 



Fig. 11. Dorsal and ventral half of pallium of T. coreanica, with main pallial sinuses and lacunae filled with eggs ; see 

 39: 14, for color. 



Fig. llo. Terminal lacunae, showing ciliary ridge. 



Fig. 12. Jlasses of eggs, idem. 



Fig. 13. A single mass of eggs, greatly enlarged, idem. 



Fig. 14. Side view of portion of mass, idem. 



Fig. 15. A highly magnified view of a few leaflets filled with eggs, idem; see 39: 1.3, for color. The yellowish border so 

 characteristic of all membranes associated with genital activity may be seen in the la-st reference. 



PLATE 58. 

 Genitalia of Terebratulina septentrionalis. 



Fig. 1. Animal in the act of ovipositing. 



Figs. 2 and 3. Small lacunae and spiculae with corpora lutea. 



Fig. 4. Showing eggs escaping from the lacunae of the pallium, passing through the nephridium, and issuing from the 

 external opening. 



Fig. 5. Cluster of eggs from genital band. 



Fig. 6. Eggs in lacune. 



Fig. 7. Left nephridium with cluster of thread-like spermaries below. 



Fig. la. Sperm threads under a compressor. 



Fig. 8. Greatly enlarged view of a few sperm threads. 



Figs. 9 and 10. Individual sperm threads showing glandular tip and spindle-shaped termination with spermatozoa; see 

 39: 10, for color. 



Fig. 11. Lacunae filled with sperm masses. 



Fig. lltt. Portion of same. 



Fig. 116. Spermatozoa. 



PLATE 59. 



Vesicular organ known as "accessory heart of Hancock," of Terebratulina septentrionalis, and central and accessory vesicles 

 of Terebratalia coreanica. The accessory vesicle will be designated as genital gland. 

 Fig. 1 to 8. Terebratulina septentrionalis. 

 Fig. 1. Genital gland springing from genital band with supplementary vesicles near. 

 Fig. la. Enlarged view of surface showingspermatoblasts. 

 Fig. 2. Genital gland more developed with glandular growth at base. 

 Fig. 3. Genital gland with supplementary gland at side. 

 Fig. 3a. Much enlarged view of same. 



Fig. 4. Genital gland arising from slender stalk with glandular outgrowths on surface. 

 Figs. 5, 6, and 7. Genital glands in various stages of development. 

 Fig. 8. Portion of genital band tluckened and strongly ciliated. 



Fig. 9 to 13. Terebratalia coreanica. 

 Fig. 9. Stomach with so-called heart and genital glands at end of main pallial sinus, with glandular cord connecting 

 them with the so-called heart ; see 39 : 12, for color. 



