.ED\VAi;i) S. .Mol.'.sK ()\ 



s. t. — setal tubes. 



sU). — stomach. 



su. — supernumerary muscle. 



t. — testes. 



V. — ventral .slicll. 



V. m. — ventral mesentery. 



V. r. — ciliary ridge of visceral .sinus 



V. t. — va-scular twig. 



PLATE :i'.i. 

 Kejiriiductidn.s iif ori<;inal (lr:i\vinf;s tn illiisliatc colipr in livin;; Hracliin].iicla.' 



Fig. 1. hingula lepidulu horn ventral side. 



Fig. 2. Brachia of L. kpidula showing color of border and rirri. 



Fig. 3. Anterior portion of ijalliuni of L. lepidnla. 



Fi.g. 4. Portion of pallium of Gloltidiri pi/raiiiidnln showing three rows of gill ampullae and pigmentation between. 



Fig. "). View of pallium .showing anterior pallial folds. 



Fig. ti. Enlarged view .showing ])ign]entation of pallial fold. 



Fig. 7. Cirrus of G. j;;/m,)/(((/(i^t shciwing pigmentation. 



Fig. 8. Nephridia of Didlhui ynti/n. 



Fig. 9. Nephridia of Tenibnitulinn mptaidrioiudin. 



Fig. 10. Spermary thiead of T. sfptentrtnuidis. 



Fig. 11. Itorder of palliinn of TtrihrtiUdin cureanirn. 



Fig. 12. Slomach and immediate parUs of T. cureaiiira. 



Fig. 13. Ovarian leaflets oi T. coreaiiica. 



Fig. 14. Pallium and pallial .sinuses of T. rureiuica filled with eggs. 



PLATE 40. 



Appearance in life of \arious forms. 



Fig. 1 to 5. l!loUidi<i pi/raiiiidida. 



Fig. 1. Dorsal view, at rest. - 



Fig. 2. Dor.sal shell, oscillating. 



Fig. 3. Side view, dorsal shell elevated. 



Fig. 4. Side view, dorsal shell depressed. 



Fig. 5. Peduncle showing vermiform convolutions with posterior end inclosed in sand tube. 



Fig. (i to Lj. Llnyula lepidula. 



Figs. G, 7, 8, and 9. Various attitudes. 



Fig. 10. Burrow in sand. 



Fig. 11. Eleven individuals attached to bottom of bowl by saud accretions ; comp.tre with Glollidia (41 : 13). 



Figs. 12 and 13. Showing attitude in saud, with setal tubes formed. 



Fig. 14. Front view showing anterior pallial folds and setal tube oiienings. 



Fig. 15. Side view with lateral setae vertical and meeting. 



Fig. 16 to 18. Liwjnla anatina. 

 Fig. 16. Showing end of peduncle encased in mud tube. 

 Fig. 17. Young specimen with brachia extended laterally. 

 Fig. 18. Dorsal view of partially grown individual. 

 Fig. 19. Side view of Discinisca lamdlosa from alcoholic specimen. 



1 Fiu' explanation of details of these figures see succeeding plates. 



