246 BULLETIN OF THE 



portions free and tapering toward the bilabiate mouth ; chitinous processes ex- 

 tend downwaids from the base of each hydrotheca, surrounding an aperture 

 through which the body of the polypite is comiected with the ccenosarc 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 charactoiistic, and with the aid of the different views given 

 in the figures may be readily understood. 



Sertularia distans Allman. 



A small cluster of eight to ten stems of S. 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. 83° 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 V. Figs. 39-30 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 intemodes of unequal length, the upper portion from a point just below 

 the origin of the first branch divided by very obliqi\e 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 is 

 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 tlie upper surface of the same internode are borne three nemato- 

 phores all arising from the median line ; these cauline hydrothecfc have a pair 

 of nt'iiiatophores, which are supported on jirocesses from the stem that arise on 

 the front edge of the hydrotheca;. Tlie branches are divided very obliquely 

 into intemcMles, of which the ba.sal or proximal one gives rise to two nemato- 

 yihores which spring from tlu; median upper surface ; the others bear each a 

 hydrotheca with its pair of supra-calycine nematophores, a single nematophore 



