34 CTENOPHORES OF THE ATLANTIC COAST OF NORTH AMERICA 
long, however, as in M. leidyi and do not quite reach to the level of the 
apical sense-organ. The 4 meridional ventral rows of combs which ex- 
tend out over the oral lobes are about one-third longer than the 4 rows 
which lead to the auricles. The meridional ventral rows begin also ata 
greater distance from the apical sense-organ than do the meridional sub- 
tentacular combs. The windings of the meridional ventral canals in the 
oral lappets are very simple, thus differing markedly from the conditions 
seen in M. leidyi and M. mccrady. The apical sense-organ is sunken 
within a deep cleft about one-sixth as deep as the total length of the 
body. 
The surface of the oral lobes and the adjacent parts of the body 
are besprinkled regularly with small, low, discoidal warts. The animal 
is translucent and slightly bluish in color. It is very abundant along the 
coast from Chesapeake Bay to Florida, being especially common in bays, 
sounds, and estuaries where the water is slightly brackish. 
I have never seen any intergrading forms between this southern 
species and the somewhat more northerly M. leidyi. M. leidyi is a 
creature of the pure sea-water along the outer shores, while M. gardeni 
thrives in protected bays and brackish waters. 
Genus LEUCOTHEA Mertens, 1833. 
Eucharis, preoccupied by LaTREILLE for Hymenoptera in 1804. 
Eucharis, used for Mollusca by PéRon in 1807. 
Eucharis, EscuscHoutz, 1825, Isis, p. 742; also, 1829, Syst. der Akal., p. 31.— 
CHUN, 1880, Ctenophoren des Golfes von Neapel, p. 296.—AGassiz and 
Mayer, 1899, Bull. Museum Comp. Zool. at Harvard College, vol. 32, p. 176.— 
ALLMAN, 1882, Journal Linnean Soc. London, vol. 16, p. 103. 
Beroé, Quoy ET GAIMARD, 1824, Voyage de l’ Uranie, Zool., p. 574. 
Alcioné, DELLE CuIajJE, 1829, Mem. Animali senzavert., Napoli, tome 4, p. 7. 
Ibid., 1841, Tav. 150. 
Leucothea, MERTENS, 1833, Mém. Acad. Sci. St. Pétersbourg, Sci. Math. Phys. et 
Nat., sér. 6, tome 2, p. 499. 
Chiaja, Lesson, 1843, Hist. Zooph. Acal., p. 77. 
GENERIC CHARACTERS. 
Lobatz in which the oral lobes are of large size and contain com- 
plexly-winding chymiferous tubes. The auricles are long, thick, and 
coiled in helices with the cilia extending in a loop up and down one side. 
The outer surface of the body and lobes are covered with long, conical 
papilla. The aboral blind ends of the subtentacular meridional canals 
are long. The 2 median tentacles are very long; 2 long, blindly ending, 
pit-like depressions extend inward from above the tentacles nearly to 
the level of the funnel. 
This genus is descended from a Bolinopsis-like ancestor, for it passes 
through a stage in which it can not be distinguished from Bolinopsts. 
The large papilla which cover the external surfaces of the oral lobes and 
of the body are late in developing and do not appear until the animal 
has passed through the Bolinopsis stage. In this connection it is interest- 
ing to observe that Bolinopsis elegans of Mertens, 1833, is covered with 
small papilla on the whole outer surface of its body, save only upon the 
lower parts of the oral lobes. 
The name Eucharis is preoccupied, having been used for Hymenop- 
tera by Latreille, 1804. Alcinoé of Delle Chiaje, 1829, can not be used, 
