LIVING BRACHIOPODA. 385 



Fig. 7. Slomacli, stomachal glands, ami right occhisor muscle of D. Idiiiiilosd with ilio-parietal liaiid turned forward to 

 show ovaries arising from it. 



^ Fig. 8. Greatly enlarged view of ilio-parietal band from above; Kgure showing proliferation of genital strands with eggs 

 in masses. 



Fig. 9. A group of eggs attached to genital strand, idem. 



F^ig. 10. A group of eggs attached to genital strand, greatly eidarged, idem. 



Fig. 11. ])or.sal and ventral half of pallium of T. carcanira, with main pallial sinu.ses and lacunae tilled with eggs ; .see 

 39: 14, for color. 



Fig. 11a. Terminal lacunae, showing ciliary ridge. 



Fig. 12. Masses of eggs, idem. 



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



¥\^. 14. Side view of portion of mass, idem. 



Fig. 1.5. A highly magnified view of a few leaflets tilled with eggs, idem; see 39: 1.3, for color. The yellowish liorder so 

 characteristic of all membranes associated with genital activity may be seen in the last reference. 



PLATE 58. 

 Genitalia of Tereiiratiilind septintrionalis. 



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'laoune. 



Fig. 7. Left nephridium witli cluster of thi'ead-like sperjnaries below. 



Fig. 7a. 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 aiul spindle-shaped termination with spermatozoa; see 

 39: 10, for color. 



Fig. 11. Lacunae filled with sperm masses. 



Fig. 11a. Portion of same. 



Fig. 116. Spermatozoa. 



PLATE .59. 



Vesicular organ known as "accessory heart of Hancock," of Terehratulina septentriunalis, and central and accessory vesicles 

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

 Fig. 1 to 8. Terebrntulina septentrional is. 

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

 Fig. la. Enlarged view of surface showing spermatoblasts. 

 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 outgrowtlLs on surface. 

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

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



Fig. to 13. Terebratalia curuaiiica. 

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

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



