CTENOPHORES OF THE ATLANTIC COAST OF NORTH AMERICA 37 
at Harvard College, vol. 39, p. 267, plate 8, fig. 30.) Also Chun, 1880 
(Ctenophoren des Golfes von Neapel, p. 242), found yellowish-green para- 
sitic cells of alge in the meridional canals of Euchlora which resemble 
the yellow cells of Radiolaria. 
The histologic structure of the papille of Leucothea is described by 
R. Hertwig, 1880, Jena. Zeit. fir Naturw., Bd. 14, p. 334, Taf. 21, Fig. 3. 
Genus OCYROPSIS (nom. nov.). 
Ocyroé, presecupied in 1809, for meduse by Péron and Lesuzur. 
Ocyroé, RanG, 1828, Mém. Soc. Nat. Paris, tome 4, p. 172.—LeEsson, 1836, Annales 
des Sci. Nat., sér. 2, tome 5, p. 250.—FEWKES, 1882, Bull. Museum Comp. 
Zool. at Harvard College, vol. 7, p. 252.—CuuN, 1880, Ctenophoren des Golfes 
von Neapel, p. 290.—MoseEr, 1903, Ctenophoren der Siboga-Expedition, p. 17, 
also, 1908, Abhandl. Akad. Mtinchen, Suppl. Bd. 1, Abhandl. 4, p. 65. 
Calymma, EscuscHoLtz, 1829, Syst. der Acalephen, p. 33.—MERTENS, 1833, Mém. 
Acad. Sci. St. Pétersbourg, Sci. Math. Phys. et Mae sér. 6, tome 2, p. 508. 
Calymma, preoccupied in 1816 for Lepidoptera by HUsner. 
GENERIC CHARACTERS. 
Lobate with body laterally compressed in the funnel-diameter and 
with large, muscular oral lappets. These lappets arise from the sides 
of the body in the stomodzal axis, and it is mainly by means of their 
contractions that the animal is enabled to swim. The ciliated combs 
are not very numerous and in the young animal they tend to lie parallel 
with the meridional canals, as in Cestum. In the adult, however, they 
usually lie diagonally across the canal. The auricles are well developed 
and arise from the body near the sides of the oral lappets. There are no 
tentacles in the adult and no tentacular canals. 
Three species, O. crystallina, O. maculata, and O. fusca are described 
by Rang from the tropical Atlantic. O. crystallina is transparent; O. fusca 
uniform dull brown, and O. maculata has 2 large, conspicuous, brown 
spots on each oral lobe. Eschscholtz, 1829, describes a form of Ocyropsis 
from the Equatorial Pacific under the name Calymma trevirant. 
Ocyropsis bears some resemblance to Deiopea of the Mediterranean, 
but the oral lobes of Deiopea are smaller and the two meridional ventral 
vessels in each lobe end blindly, whereas they form a closed circuit in 
Ocyropsis. Also Deiopea has tentacles, and these are absent in Ocyropsis, 
wherein there are neither tentacles nor tentacular canals. 
The genus is found only in the tropics, being represented in both 
the Atlantic and the Pacific. 
Unfortunately, the old and well-known generic name Ocyroé can not 
be retained for Ctenophore, for it was applied to a medusa by Péron and 
Lesueur, 1809 (Annales du Museum, Hist. Nat., Paris, tome 14, p. 354). 
The name Calymma given to this ctenophore by Eschscholtz, 1829, is 
also preoccupied, having been used by Htibner for Lepidoptera in 1816. 
While we must all regret the abandonment of long-used and familiar 
generic names, yet the law of priority, which the zoologists of the world 
have in congress assembled given their pledge to support, obliges us to 
revert to the oldest distinctive name; and as preoccupied names must 
be abandoned, no matter how familiar to us in association, it is expedient 
that the operation of changing them be executed at once. In place of 
Ocyroé I propose the new name Ocyropsis. 
