Bull. U. S. F. C. 1899. (To face page 492.) 
Plate XVI. 
203 
199. Spiroptera pectinifer sp. nov., continued. Ventral view of pos- | 201. Posterior end. x 65. 
tenor end of male, x 300. ch, Chitinous toothed plate. | 202. Embryo sketched in uterus, x 300. 
Note.— There were four more groups of three papillae, each | 203. Dacnil.is Mans Dujardin, from Leptoccphalus conger. Lateral view 
seen on the left side anterior to those shown in the figure. of head, optical section, x 100. 
200. Dacnitis sphserocephala Dujardin, from Acipenser sturio. Anterior I 204. Posterior ventral view of same, x 100. 
end, optical section, x 65. 
