66 AMERICAN HYDKOIDS. 



PLUMULARIA VIRGINIA, new Species. 

 (Pluto VII, figs. 5-10.) 



Trophosome. Colony growing in tufts of simple plumose steins attaining a lieiglit of about 

 one-half inch; stem not fascicled, divided into regular internodes each of which bears a hydro- 

 cladium on a stout process from near its distal end mid shows a thickened internal ridge near each 

 end ; hydrocliidia alternate, not very closely approximate. Proximal interuode short, with a single 

 internal ridge; all of the remaining internodes are hydrothecate, each with a very strong internal 

 thickening on its anterior side just below the mesial nematophore and another below the supra- 

 calycine pair. Hydrothecu- borne just above the middle of the internodes on very strong shoul- 

 ders or protuberances, very shallow, basin shaped, with broadly tlaring sides; hydranths very large, 

 robust, with about L!4 tentacles and a broadly expanded hypostome, reminding one of/', hitlc/'it/lilrx. 

 Nematophores long, conical, with a very shallow distal chamber, and containing sarcostyles with 

 remarkably symmetrical batteries of small iiematocysts and the usual sarcodal process, supra- 

 calycine uematophores borne on prominent swellings of the internode and directed upward and 

 outward, a mesial nematophore near the proximal end of each internode and a cauline nemato 

 pliore in the axil of each hydrocladiuin. 



Gonnsnme. Gonangia borne in a row on the front of the stem, long, with the distal end pro- 

 duced into a neck, as in P. setacea. The younger gonangia are long conical bodies with truncated 

 distal ends. 



Distribution. Dredged oft' Santa Barbara, California, outside of the kelp, by Mrs. Virginia 

 Barrett Gibbs, in whose honor it is named. This very distinct species has the shallowest hydro- 

 tbeea 1 , together with the largest hydranths, of any American form that 1 have seen. 



Type slides. Cat. No. 153H4, Mus. State Univ. Iowa; Cat. No. 18028, U.S.N.M. 



PLUMULARIA MACROTHECA Allman. 



(Plate VIII, iig. 1.) 

 Plitmulariit macrotheca ALLMAN, Mem. Mus. Coinp. /ool., V, No. 2, p. 30, pi. xvin. 



Trophosome. Hydrocaulus attaining a height of about -' inches, simple, fascicled, springing 

 from an entangled mass of h'ne tubular filaments; pinna- very slender, alternate, composed each 

 of a succession of long internodes alternating with short ones, each of the long iuternodes bearing 

 a hydrotheca. Hydrotheca- deep, tubular, with very slightly everted margins. Supracalycine 

 nematophores springing each from a short process which projects from the long internode, just 

 below the margin of the hydrotheca, one mesial nematophore carried by the same iuternode at 

 the proximal side of the hydrotheca, and another on each of the short iuternodes. 



Gonosome. Not known. 



Distribution. Oft' Cojima, Cuba, from a depth of 450 fathoms. 1 



This is a very distinct species characterized by its unusually deep hydrotheca- in connection 

 with hydrothecate and intermediate internodes. It has not been found by any expedition subse- 

 quent to Pourtales's explorations of the Gulf Stream. The species has not been seen by the present 

 writer. 



Type. In Museum of Comparative Zoology, Cambridge, Massachusetts. 



PLUMULARIA PROFUNDA, new species. 

 (Plate VIII, figs. 2,3.) 



Trophosome. Colony attaining a height of 6 inches, pinnately branching, forming a llabellate 

 structure; stem consisting of a central tube from which the hydrocladia arise, surrounded by a 

 number of supplementary supporting tubes, fascicled except at distal portions of the branches, 

 the nonfascicled part being divided irregularly into internodes the shorter of which bear one and 

 the longer two hydrocladia upon strong processes from the stem ; where one hydrocladium only 



' Original description. 



