240 BULLETIN OF THE 
portions free and tapering toward the bilabiate mouth; chitinous processes ex- 
tend downwards from the base of each hydrotheca, surrounding an aperture 
through which the body of the polypite is connected with the coenosare of the 
stem. 
Gonosome. — Unknown. 
Locality. -— Yucatan. Attached to an Alga. 
This form has a general resemblance to S. pumila, but a glance suffices to 
show that the likeness is a superficial one. The internal chitinous ridges are 
quite peculiar and characteristic, and with the aid of the different views viven 
in the figures may be readily understood. 
Sertularia distans ALLMAN. 
A small cluster of eight to ten stems of $, distans, three quarters of an inch 
high, without gonangia, were collected near the Tortugas Islands in a depth of 
36 fathoms, Lat, 24? 46 N., Long. 839 16 W. 
Sertularella amphorifera ALLMAN. 
This is one of the most abundant species in the collection ; a considerable 
number of very fine specimens with gonangia having been taken at a depth of 
101 fathoms. 
Locality. — Lat. 25° 33! N., Long. 84? 21 W. 
Sertularella conica ALLMAN. 
A single small specimen of this form, half an inch in height, occurred from a 
depth of 36 fathoms in Lat, 24° 34! N. and Long. 83? 16/ W, 
Plumularia gracilis sp. nov. 
Plate ۷۰ Figs. 29-30 c. 
Trophosome. — Hydrocaulus minute, one third of an inch in height, stout, 
tapering towards the distal end, the basal portion divided by transverse joints 
into internodes of unequal length, the upper portion from a point just below 
the origin of the first branch divided by very oblique nodes into internodes of 
quite regular length ; these internodes of the upper part of the stem each give 
origin to a pair of branches which arise opposite each other on the sides of the 
stem ; on the upper surface of the stem between the bases of the branches ir 
borne a hydrotheca, and near its base on the upper surface of the proximal por- 
tion of the internode is borne a single nematophore, while in front of the hy- 
drotheca on the upper surface of the same internode are borne three nemato- 
phores all arising from the median line ; these cauline hydrothece have a pair 
of nematophores, which are supported on processes from the stem that arise on 
the front edge of the hydrothece. The branches are divided very obliquely 
into internodes, of which the basal or proximal one gives rise to two nemato- 
phores which spring from the median upper surface ; the others bear each a 
hydrotheca with its pair of supra-calycine nematophores, a single nematophore 
