HYDROMEDUSAE, SIPHONOPHORES, AND CTENOPHORES. 361 



EXPLANATION OF PLATES. 



All figures are from photographs of preserved specimens. 



Plate 39. 

 Protiara tropica. 



Fig. 1. Side view of type. X about 5. 



2. Transverse section of upper part of manubrium showing gonads discon- 



tinuous in perradii (Per) and interradii (Int). X 25. 



3. A tentacle, with part of the radial canal. 



4. Aboral view of manubrium, showing its cruciform outline, and the radial 



canals (C. Ra). 



Leiickartiara octona. 



5. A specimen 6 mm. high, with part of the bell-wall dissected away to 



show the gonads (Go) and lips (L). 



6. Outer view of one tentacle of another specimen, a small tentacle 



(T 2 ), a knob (T 3 ), and part of a radial canal. (C. Ra). X 15. 



Neoturris pilcata. 



7. Manubrium and gonads (Go) of specimen lil mm. high, (C. Ra) radial 



canal; (L) lip. X 5. 



8. Portion of margin, to show radial canal. (C. Ra) and tentacles (C. C), 



circular canal. 



Heterotiara minor. 



9. Specimen 8 mm. high. 



Plate 40. 



Fig. 1. Neoturris pileata. Part of margin with two tentacles (C. C), circular 

 canal. 



Heterotiara minor. 



2. A specimen 6 mm. high, showing contraction of the upper part of the sub- 



umbrella. 



3. Upper part of the subumbrella of another similarly contracted example, 



with the manubrium, (C. Ra), radial canal. X 20. 



4. Manubrium of specimen shown in plate 34. figure 9, showing folds. 



Calycopsis geometrica. 



5. Oblique side view showing canal system. X 3.5. 



6. Manubrium of same, showing gonads (Go) and simple quadrate lips. 



The canals which appear to end blind have been broken in dissection. 



7. A portion of the margin showing the pigment masses (0) at the bases of 



the tentacles. 



Calycopsis typa var. simulans. 



8. Part of the bell wall, to show canal system. One canal ends blind and 



2 pairs are connected by transverse trunks. X 3. 



Plate 41. 



Calycopsis typa var. simulans. 



Fig. 1. Side view of specimen with part of the bell wall cut away to show the 

 manubrium. X 2.5. 



