28 DR. R. E. GRANT ON THE GENUS LOLIGOPSIS. 
mantle; h. dorsal or ascending aorta ; 7. 7. enlargements of the branchial veins at their 
entrance into the systemic ventricle. 
Fig. 9. Cluster of ova attached by their peduncles, and containing each a central 
yolk. 
Fig. 10. Structure of the ovum as seen through the microscope. 
