14 CTENOPHORES OF THE ATLANTIC COAST OF NORTH AMERICA 
Grabe, 1901, finds that in Pleurobrachia pileus the anlagen of the 
sexual cells are found, not only in the 8 meridional canals, but also in the 
paragastric and tentacular vessels. The sex-cells are apparently of ecto- 
dermal origin, as R. Hertwig, 1880, found them to be in other ctenophores. 
L. Agassiz, 1849, gives beautiful figures of P. pileus. 
Pleurobrachia brunnea sp. nov. (Figs. 2 to 4, plate 1.) 
This species may be at once distinguished from the more northerly 
Pleurobrachia pileus by its more oblong, egg-shaped body, and especially 
by the opaque yellow-brown color of the stomodzeum and the terminal 
knobs of its tentacles. 
The body is egg-shaped with but little lateral compression and is 
1zmm.long. The 8 ciliated tracts are of equal lengths and extend over 
the middle two-thirds of the sides of the body. The 8 meridional canals 
extend downward a considerable distance beyond the combs of cilia 
and end blindly without anastomosing. The 2 tentacles arise from deep 
clefts which open to the exterior at the middle of the aboral half of the 
sides of the body. Each tentacle gives rise to about 32 simple side 
branches, which often coil into helices and are highly contractile. The 
main shaft of each tentacle terminates in a large, knob-shaped end. A 
row of deep purple pigment spots extends half-way down each tentacle 
shaft on the abaxial side, and the side branches of the proximal halves 
of the tentacles are also dotted over with these purple spots. The ten- 
tacles differ markedly from those of Pleurobrachia pileus in their fewer 
side branches and in the fact that they end each in a large knob. 
This species was found by the author in large swarms off the coast 
of New Jersey, from Sandy Hook to Barnegat Bay, on October 16, 1904. 
It is separated from Hormiphora plumosa by the greater length of its 
meridional vessels, which extend a considerable distance beyond the oral 
ends of the rows of combs instead of ending with the combs, as in H. 
plumosa, The bases of the tentacles are not closely applied to the sides 
of the paragastric vessels as in Hormiphora, but are widely separated. 
Moreover, in H. plumosa the lower (oral) ends of the tentacle-sheaths 
are slightly below the ends of the meridional canals, whereas in P. brunnea 
the meridional canals extend below the ends of the tentacle-sheaths. 
P. brunnea bears a closer resemblance to Hormiphora spatulata Chun, 
from the Canary Islands and the Straits of Gibraltar, but its ciliated 
combs begin at a greater distance from the apex than in H. spatulata, 
and the tentacles of P. brunnea terminate in knob-like ends instead of 
tapering to points. H. spatulata is described by Chun, 1898, Ctenophoren 
der Plankton Expedition, p. 18, Taf. 2, 3. 
Genus HORMIPHORA L. Agassiz, 1860. 
Cydippe, GEGENBAUR, 1856, Archiv fiir Naturgesch., Jahrg. 22, p. 200.—Sars, M., 
1856, Middelh. Litt. Fauna, p. 71.—PANcERI, 1872, Atti Acad. Napoli, vol. 
, Pp. 2. 
Howe phon, Acassiz, L., 1860, Cont. Nat. Hist. U. S., vol. 3, p. 196.—CHUN,. 
1880, Ctenophoren des Golfes von Neapel, p. 280; also, 1898, Ctenophoren 
der Plankton-Expedition, p. 16.—MoseEr, 190%, Ctenophoren der Siboga- 
Expedition, pp. 9, 31; 1908, Abhandl. Akad. Mtinchen, Supplement Band 1, 
Abhandl. 4, p. 10; 1909, Ctenophoren der deutsche Siidpolar-Expedition, 
Bd. 11, Zool. 3, p. 148. 
