EEPOET 02s THE HYDBOIDA. 
71 
Desmoscyphus pectincitus, n. sp. (PL XXX TV. figs. 1 , la, 16). 
Trophosorne. — Main stem monosiphonic, simple, carrying alternate pinnately disposed 
ramnli along nearly its entire length. Hydrotkecas of pinnae exactly opposite, those of 
each pair closely approximate but not connate, adnate to the internode for somewhat 
more than half their height, and diverging towards then summits at a low angle ; those 
of the stem alternate, distichous, adnate to the internode for nearly their entire height ; 
all the hydrothecse tapering towards the summit, where they terminate in a two-lipped 
orifice. 
Gonosome not present. 
Locality. — Station 162, off East Moncceur Island, Bass Strait; depth, 38 to 
40 fathoms. 
Also off Bahia. 
This is a small but elegant species. The largest of the examples contained in the 
collection had a height of about two inches. The hydrothecae are carried both by the 
stem and pinnae. Y’hile those of the pinnae are opposite and closely approximate by their 
opposed sides, those of the stem are alternate and widely separate. The orifice is cloven 
so as to present two lips, an anterior smaller and a posterior larger. The interval 
between the lips would seem capable of being closed in the living state by two valve-like 
membranes of extreme tenuity, some shreds of which were occasionally retained in the 
specimens. 
The joints of the pinnae are usually distinct between each pair of hydrothecae. In 
some specimens, however, they were here and there nearly or quite obliterated. 
The stem is divided by well-marked equidistant joints into regular internodes, each 
internode carrying one, or in some cases two, pinnae. Three hydrothecae occupy the 
interval between every two pinnae on each side. 
The hydrothecae of the pinnae, though all brought to one side of their supporting 
internodes and closely approximate, are not exactly connate. This slight departure, 
however, from absolute coalescence affords no grounds for regarding the species as other 
than a true Desmoscyphus. The close approximation of the hydrothecae, and the fact 
of their being all brought to one side of the internode, are decisive in favour of its 
allocation in the genus Desmoscyphus. 
Desmoscyphus pectinatus was obtained from two widely separated localities, Bass 
Strait and the region off Bahia. 
Desmoscyphus gracilis, n. sp. (PL XXXI V. figs. 2, 2a, 2b, 2c). 
Trophosorne. — Stem monosiphonic, not divided into branches, springing at intervals 
from a creeping, filiform stolon, gently undulated, sending off regular, pinnately disposed, 
