Fig. 1. 
Fig. 2. 
Fig. 3. 
Fig. 4. 
Fig. 5. 
Fig. 6. 
AGASSIZ AND MAYER: DACTYLOMETRA. 9 
EXPLANATION OF PLATES. 
PLATE I. 
Dactylometra quinquecirra, from a photograph. 
PLATE IL 
Side view of Dactylometra quinquecirra, } natural size. Specimen found 
at Tiverton, Rhode Island. 
PLATE IIT. 
Aboral view of a mature male Dactylometra quinquecirra, measuring 
190 mm. in diameter. ‘Tiverton, Rhode Island. 
PLATE IV. 
Oral view of Dactylometra quinquecirra. One of the oral fringes is cut 
away in order to expose to view one of the sub-genital pits (see gpt, 
Figs. 5, 13, 16, 17, 22, and 24). From a specimen found at Tiverton, 
Rhode Island, measuring 180 mm. in diameter. 
PLATE V. 
Side view of a Dactylometra quinquecirra which has been confined for 
a considerable length of time in the stale water of an aquarium. The 
bell is greatly flattened and expanded, and the oral fringes and ten- 
tacles lie spread out over the aquarium floor, The specimen here 
represented is in the “ Chrysaora” stage of development; i. e. there 
are only three tentacles, and four lappets between each successive pair 
of sense organs. 
PLATE VI. 
Oral view of an octant of the disk of a mature Dactylometra quinquecirra ; 
natural size. The oral fringes are cut off in order to show the shape of 
the mouth opening (4); gen, genital organs; gpt, sub-genital pit; me 
and me’, muscles of exumbrella; mso, muscles of sub-umbrella ; rp, radial 
partitions of stomach; oc, ocular lappets; ¢, tentacular lappets; I, H, 
III, primary, secondary, and tertiary tentacles respectively. 
