228 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 



mesial nematophores are absent except those immediately below each 

 proximal hydrotheca on the hydrocladium. The gonosome is un- 

 known. 



Locality. — Dredging station 5596, off Zamboanga, Mindanao, 6° 

 54' N., 122° 4' 30" E. ; depth, 9 fathoms. 



Distribution. — Port Curtis, Australia (Bale). 



As Bale says, this species resembles Plwnularia cylindrica Kir- 

 chenpauer. It differs greatly, however, in the character of the 

 supracalycine nematophores, a character not well brought out by 

 Bale. Those in Netnertesia cylindrica are very broad and stout, 

 almost sessile with a very conspicuous bay or sinus in the margin. 



ANTENNOPSIS PACIFICA, new species 



Plate 45, figs. 3, 4 



Trophosome. — Colony 10 cm. long and with a spread of 2 cm. 

 Main stem not canaliculated nor fascicled, flexuose, dark brown in 

 color; nodes almost all oblique, deeply incised, irregular in 

 distribution. Branches much like the stem, scattered, occasionally 

 bifurcating, divided irregularly into internodes by oblique nodes, but 

 tending to bear two hydrocladia on each internode. Hydrocladia all 

 springing from the upper side of the branch, but inclined alternately 

 to the right and left, divided into regular internodes, each of which 

 bears a hydrotheca on its proximal part. No intermediate internodes. 

 Hydrothecae small, conical in shape, margins smooth everted, borne 

 on thick shoulders of the hydrocladia, rather closely approximated, 

 being separated by about twice their height, although sometimes 

 considerably more distant. All, however, are more closely approxi- 

 mated than other species of this genus that I have known. Nemato- 

 phores relatively very large, often about as high as the hydrothecae, 

 bithalamic, with the distal chamber flaring, conical in outline. Supra- 

 calycine pair inserted almost on a level with the top of the hydro- 

 theca and rising above it a distance almost equal to that of the 

 height of the latter. A mesial nematophore is inserted on the 

 shoulder immediately below each hydrotheca, and these are the 

 largest of the nematophores. Two others are usually placed between 

 the mesial one and the next hydrotheca below, while there are few 

 nematophores on the stem or branches. 



Gonosome. — Not present. 



Locality. — Dredging station 5148, Sulu Archipelago, vicinity of 

 Sirun Island, 5° 35' 40" N., 120° 47' 30" E.; depth, IT fathoms.' 



Holotype.— Cat. No. 42183, U.S.N.M. 



So far as the writer knows, this very distinct species is the first 

 of the genus Antennopsis recorded from the Pacific Ocean. The 

 shape of the hydrothecae, their approximation, and the relatively 

 great size of the nematophores are characteristic of the species. 



