S. K Clark on JVew mul Jiare Species of TTydroida. f55 



edge of the hydrotheca, two or three between the Iiyth-otheca and 

 the proximal end of the joint, and occasionally one at the distal end ; 

 on tlie main stem there are usnally two in each axil and two or three 

 on eaeli joint. ITydrotlieca^ small, sliallow, ahout equal in depth to 

 the length of the nematophores, attached to the stem by their 

 entire length; rim entire. Gonotheca? borne in the axils of the 

 stem and of the branclied ])innfe, sessile, tapering at the base, the 

 remaining portion either i-egularly cylindrical or slightly sw^ollen in 

 the middle; aperture large, terminal. Height, 2-5 inches (64"""). 



Eastport, Maine, 10-20 fathoms, 1868,— A. E. Verrill and S. I. 

 Smith. 



P. Verrillil is a beautiful little, peHucid, white species, with a deli- 

 cate, graceful habit which readily distinguishes it from any of the 

 forms now known upon our coast. It is the second genuine Plumu- 

 laria from the New England coast, both having been discovered by 

 Professor Verrill. The previously described species {P. tenella Ver- 

 rill) was dredged in 1871, off Gay Head, Martha's Vineyard, in 10 

 fathoms. It has since been dredged in 4-5 fathoms oif the Thimble 

 Islands, near New Haven, Conn., and it was also found on the piles 

 at Greenport, Long Island, August 5th, 1874, with gonothecae. It 

 differs greatly from the present species in the form of the gonothecae, 

 w^hich are in the shape of an elegantly curved cornucopia, slender at 

 the base and gradually enlarged to the end, and with a cluster of 

 nematophores at the base. The hydrotbecae are also different in form. 



EXPLANATION OF PLATES. 



Plate IX. 



Figure 1. Ohelia hicuspidata ; from Thimble Islands. 



Figure 2. Ohelia bidentata ; from Greenport, Long Island. 



Figure 3. Opercularelld pumila ; creeping form. 



Figure 4. The same, yoimg, with stem erect ; from ofiE Montauk. 



Figure 5. The same, from Portland, Me., showing a more luxuriant growth ; a and 

 c, the hydrarium ; h, gonotheca, enlarged 32 diameters. 



Figure 6. Opercularella lacerata ; a, hydrarium ; b, gonotheca ; c, medusoid ; d, un- 

 developed planulse. 



Figure 7. Campanularia calceolifera ; from Noank, Conn. 



Figure 8. The same ; a, hydrotheca ; b, gonotheca ; from Noank, Conn. 



Figure 9. Campanularia pygmcea ; from Casco Bay. 



Trans. Conn. Acad., Vol. III. 9 July, 1875. 



