Calkins. — Hydroids, 
PLATE 2. 
Fig. 8. Campanularia inconspicua. Nat. size. a. Hydrocaulus. X 18. b. 
Hydrotheca, hydranth, and stalk. X 80. c. Gonosome. X 80. 
Fig. 9. Campanularia attenuata. Nat. size. a. Hydrocaulus. X 18. b. Hy- 
drotlieca and hydranth. x 80. c. Gonosome. X 80. 
Fig. 10. Campanularia gracilis, a. Hydrocaulus. X 18. b. Hydrotheca and 
hydranth: X 80. c. Gonosome. X 80. 
Fig. 11. Campanularia caliculata. Nat. size. a. Hydrocaulus. X 18. b. 
Hydrotheca and hydranth. X 80. c. Gonosomes. X 80. 
Fig. 12. Campanularia integra. Nat. size. a. Hydrocaulus. X 18. b. Hydro¬ 
theca and hydranth. X 80. c. Gonosome. X 80. d. C. integra var. 
Nat. size. e. Hydrotheca and hydranth. X 80. 
