362 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



Calycopsis geometrica. 

 2. Margin, with large (T 1 ) and small (T 2 ) tentacles. 

 Phortis elliceana. 

 Fig. 3. Specimen 23 mm in diameter. 



4. Manubrium of another large specimen. X 8. 



5. Margin, T\ large and T 2 , small tentacle ; P. Ex., excretory papilla ; Otc, 



otocyst. 



6. Pentamerous specimen 13 mm. in diameter with hydroid blastostyles 



borne on the gonads. 



7. Portion of one of the gonads of the same. 



Phialncium mbengha var. polynema. 



8. Specimen 12 mm. in diameter. 



Plate 42. 

 Octocanna aphrodite. 



Fig. 1. Oral view of type-specimen. X about 4. 



2. Part of margin of same, showing young and old tentacles, and otocysts 



{Otc). 



Aequorea pensile. 



3. Specimen 50 mm. in diameter. 



4. Margin of same. 



Zygocanna vagans. 



5. Oral view of type-specimen. 



6. Margin of same, showing tentacles (I 71 , T 2 ), knobs, and excretory papil- 



lae (P. Ex.). 



7. Manubrium of same to show canals and lips. 



Plate 43. 

 Nauarchus halius. 

 Fig. 1. Oral view of a portion of the bell of the type-specimen, showing manu- 

 brium, one radial canal (C. Ra) with its gonad (Go), and the bases 

 of the five others, T. Ra, radial tentacle. X about 6. 



2. One sextant of the margin of the same, C. Ra, radial canal. 



3. An otocyst of same. 



4. Terminal portion of one of the interradial tentacles. 



5. Base of a radial tentacle, showing the position of the otocyst (Otc). 



Zygocanna vagans. 



6. A segment of the subumbrella showing gonads, and gelatinous papillae 



(G. P.). 



Aequorea macro dactylum. 



7. Side view of base of tentacle. 



Beroe cucumis var. ovata. 



8. General view of specimen 90 mm. high, to show ramifications of the 



meridional canals. 



9. Section of the body wall of same, showing transverse stolons which 



connect meridional (C. M.) with gastric canals (C. G.). 

 10. Portion of one of the meridional canals, with the paddle-plates stripped 

 off, to show the gonads. 



