MUSEUM OF COMPARATIVE ZOOLOGY. 247 
on the proximal side of the hydrotheca and one on the distal side, Hydro- 
theco tubular, with an entire margin which is slightly depressed on two oppo- 
site sides. 
Gonosome. — Unknown, 
Locality. — Off Havana, Cuba. Depth, 175 fathoms. 
This species is closely allied to P. geminata Allman, but differs in the ar- 
rangement of the branches, which in this form arise from opposite sides of the 
stem and lie nearly in the same plane, curving but slightly upwards. The 
arrangement of the internodes on the branches is also different, as is the ar- 
rangement of the nematophores. 
Cladoearpus tenuis sp. nov. 
Plate V. Figs. 31, 31 b. 
Trophosome. — Hydrocaulus attaining a height of an inch and a half, very 
delicate, pale straw-color, the lower portion bearing a row of nematophores, the 
upper portion giving rise to branches arranged alternately, and with three or 
four very oblique internodes just below the branched portion ; the branches or 
pinne undivided. Hydrothecw deep, slender, tubular, smallest in the centre 
and tapering both ways, largest at the distal end, a crenate rim and a large 
rectangular or obtusely pointed median tooth ; each hydrotheca overarched by 
the portion of the pinna which intervenes between it and the next. Supra- 
calycine nematophores prominent, extending above the edge of the hydrotheca ; 
mesial nematophore of about the same size of the supra-calycine, and attached 
to the enlarged portion of the pinna just below the hydrotheca, The pinna 
are ornamented with a great number of internal chitinous ridges. 
Gonosome. — Unknown. 
Locality. — Lat. 259 33! N., Long. 84? 21/ W. Depth, 101 fathoms. 
This species is closely allied to C. dolicotheca Allman ; it being similar in 
every respect in regard to the trophosome, with the exception of the shape of 
the hydrothece, and its having a more slender habit. These characters are 
very constant, and are sufficient to enable it to be readily distinguished. 
Cladocarpus dolicotheca ALLMAN. 
This species is represented in the collection by a single fine specimen from 
a depth of 339 fathoms, taken in Lat, 24° ۵ N., and Long. 82° 51! ۰ 
Aglaophenia apocarpa ۰ 
This species is well represented by some half-dozen colonies with corbule 
which are attached to what appears to be a much-worn outer investment of some 
gorgonia-like or other branched form. They are about three inches in height, 
and in good, clean condition. 
Locality. — Off Havana, Cuba. Depth, 175 fathoms, 
Aglaophenia distans ALLMAN. 
Two fine specimens with their very long pinne were dredged in a depth of 
539 fathoms, Lat, 25° 33' N., Long. 84° 35' W. 
