344 THE AMERICAN NATORA LISI MNNVOE. Xk OV ils 
the margin and forming crescents at the marginal lobes; manubrium 
similarly mottled on the outer edges of the arms, inner edges and frills 
delicate flesh-colored ; tentacles a dull, madder-red; gonads pale purplish. 
Two specimens of this medusa have been taken in the Woods Holl region 
recently, the last in July, 1902, some 65 miles south of Marthas Vineyard. 
According to Agassiz, Contr. Nat. Hist. U. S., the development of this 
medusa is direct, skipping the fixed polyp and strobila stages. . 
Dactylometra quinguicirri L. Ag. 
Umbrella rather high and arched aborally much as in Pelagia, disk three 
to four times as broad as high. Manubrium long and pendulous with 
slender oral arms, which are more or less frilled as in P. cyanel/. Rhopalia 
8, marginal tentacles 40, marginal lobes 48. In arrangement five tentacles 
are located between each pair of rhopalia in adult specimens, though in some 
cases only three are present, particularly in small specimens. Gonads in 
four masses within the gastric pouches, and beneath each gonad in the sub- 
umbral wall is a prominent subgenital pit. 
Color.— In general much like Pelagia, though less brilliant, the various hues 
being paler and somewhat more delicate. Exumbrella delicate bluish, 
mottled with reddish brown fading into yellowish; tentacles reddish to 
orange; oral arms pale pinkish with bluish tint variously blended, making 
this medusa one of the most beautiful among the Pelagide. 
Distribution — \s less extended than that of Aurelia or Cyanea. It is 
quite common in Buzzard’s Bay, Vineyard Sound, Nantucket. 
Like several of the preceding Dactylometra exhibits considerable varia- 
tion. According to Mayer, Bull. Mus. Comp. Zool. Vol. XXXII, No. 7, 
the tertiary tentacles arise on either side of the ocular lappets. In several 
specimens examined during the past summer this was not found to be the 
case. On the contrary they sprang in every case examined between the 
primary and secondary sets. Again according to the same observer the 
tertiary tentacles only appear when the meduse approximate maturity, and 
after attaining a size of 130 mm. in diameter. On the contrary I found 
them well developed in specimens having a size of only 40 mm. and where 
no gonads were developed. There was also noted the same variation in 
the marginal lobes and other organs which have been noted in connection 
with species previously noted. 
Dactylometra lactea L. Ag. 1862. 
This is a southern medusa, no record of its occurrence north of Florida 
having come to my notice. In general aspects it is much like the preced- 
ing species, though of smaller size. Its color is milk-white with a purplish 
iridescence, and with yellowish dots over the exumbrella. It has been 
reported from the Bahama and Tortugas Islands, from the Gulf of Mexico, 
and from the coast of South America. 
