MUSEUM OF COMPARATIVE ZOOLOGY. 205 



PLATE III. 

 Lepidonotus, Telepsavus, and Phyllochsetopterus. 



a. Anus. (£■ (Esophagus. 



b. Branchiaj. pi- Prajoral lobe. 

 e. Elytron. s. .Stomacli. 



i. Intestine. t- Tentacle. 



m. Mouth. ^9- Ventral gland. 



WIS. Modified fourth segment. 



Fig. 1. Side view of a young larva of Lepidonotus. 



" 2. Ventral view of a still more advanced larva of Lepidonotus, 



" 3. Older larva of the same. 



" 4. Oldest larva of Lepidonotus (dorsal view). 



" 5-15. Telepsavus (■?). (Figs. 8-15 drawn by A. Agassiz.) 



" 5^ Youngest larva of Te/e/;say«s (dorsal view). 



" 6. Older larva of Telepsavus (ventral view). 



" 7. Side view of the last. 



" 7^ Tail of the last. 



" 8. Older larva of Telepsavus. 



" 9. Side view of the last. 



" 10. Side view of a still older larva. 



'• 11. A larva still older (dorsal view). 



" 1"J. Oldest Telepsavus larva. 



" 13. Mouth and pra'oral lobe of the same. 



" 14, 15. Differently formed spines of the oldest larva. 



" lG-18. J^a,T\x of P/ujllochcetopterus ('.). 



" 16. Youngest larva of P/iyllochcetopterus. 



" 17. Side view of tlie same. 



" 18. Older larva of the same. 



" 19, ?0., Larvffi of Capittlla. 



PLATE IV. 



Nephthys and Lepidonotus. 



dc. Dorsal cirrus. m. Moutli. 



I. Intestine. ps. Pigment spots. 



j. Jaws. s. Stomach. 



k. Cephalic spots (ocelli ?). vc. Ventral cirrus. 



Fig. 1. Youngest larva of Xr/j/f/Z/ys. 



2. Older larva of the same. 



3. The same. 



4. Still older larva from tlic ventral side. 



5. Later stage (ventral view). 

 5". Lateral view of ttie last. 

 G. Larva with well-developed ]iarapodia. 

 C. Single parapodium of the same. 



