28 MUSEUM, BROOKLYN INSTITUTE OF ARTS AND SCIENCES. 
otocysts develop simultaneoii.sly. When set free the medusa has eight well 
developed tentacles, and eight marginal sense organs; each containing two 
spherical otoliths (Figs. 41, 42). 
SCYPHOMEDUSAE. 
Tamoya haplonema, F. MOllek. 
Figs. 61-64, I'lntc VII. (Fig. GO?.) 
MOller, F.. 1859 ; AbbaiuU. Naturf. ges. Halle , Bd.V.. p. 1, Taf. I., II. 
Agassiz, L., 1863; Cont. Nat. Hist. U. S., Vol. IV., p. 174. 
Haeckel, E., 1880; Syst. der Medusen, p. 443. 
Young medusa ? "Tamoya punctata, " Fewkes, J. AV., 1883; Bull. Mus. Comp. Zoo), at Har- 
vard Coll., Vol. XI., No. 8, p. 84, PI. I., Figs. 4-6. 
The young of the Charybeidai are so different in appearance from their 
adults, and the characteristic structures, observation of which is necessary 
for their classification, are so late in developing that it is all but hopeless to 
attempt to determine them. For example: tlie young specimens called 
"Tamoya punctata" Fewkes (Fig. GO, IMate VII) are exceedingly abundant 
in the Bahamas during the spring and summer, Avhereas the adult is unknown. 
^Vhon young they swim near to tlie surface Avhile it seems probable that 
the adults sink to the bottom. 
However, the young "Tamoya punctata" lacks all trace of gastric cirri, 
gonads, velar canals, or well developed pedalia; and we are therefore unable 
to state whether it be the young of Tamoya or Charybdea. Moreover, the 
exundu'clla of the young Charybeidie are usually besprinkled with prominent, 
more or less pigmented, clusters of nematocysts which are often arranged in 
definite rows. These either lose their regular order or become much less prom- 
inent in the adult, so that while they are a most conspicuous feature of the 
young Ihey are quite inconspicuous in the mature animal. We see, therefore, 
that the names of immature forms, such as "Tamoya i)nnctata," Fewkes; 
"Charybdea aurifera," Mayer; and "Charybdea verrucosa," Ilargitt, have 
practically no significance. 
It seems ])ossible, however, that "Tamoya punctata," Fewkes, is the young 
of Tamoya haplonema, F. INI tiller. 
Tamoya lia|>l<)uema. is widely distributed, having been found on the coast 
of Brazil; in (he West Indies; at Beaufort, North Carolina; and in Great 
Peconic Bay, Long Island, New York. Our Figures, ()I-(>4, were obtained 
from a specimen captured at the last named place early in September, 1902. 
