58 AMERICAN HYTVROTDS. 



SERTULARIA CORNICINA (McCready). 



( Plate IV, lijjs. 1-5. i 

 Dynamena cornichia McCREAiiy, Gymnophthalmata of Charleston Ilarlmr. isiss, p. 204. 



i mi i-nritiriiiii A. AI.ASMX, Xnrtli Aim-rirau Acaleplue, 1SB5. p. 142. 

 Si liiilnrin cnrriiciiin VEKHII.L, Invert. Vineyard Sound, 1871-72, p. 733. 

 S, rlul:i,-i<i niriiifliiii VEKKII.I., Amer. Journ. Sri. and Arts, III, 1872, p. 437. 



i i-iiiiijili.nl CLARKK, Bull. Mus. Comp. Zool., X, 1879, p. 245. 



i i-uiii/ili'.i'n HALE, Proe. Linn. Sor. New South Wales, III, 2d Ser, 1888, p. 769. 



i i-nriiii-iiiii Ni'TTixi,, Hydroids of the Woods Hole Region, 1901, p. 359. 



i rniii/i/i.iii XUTTINU, Hydroids of the Woods Hole Region, 1901, p. 360. 

 ticrluluria coniii-iiiii HARGITT, Amer. Nat., 1901, p. 390. 



Trophosome. Colonies growing in the form of erect un branched .stems, often bearing closely 

 associated colonies of a parasitic campanularian, II<l>,Iln nil<-</r<ifa, and growing from a creeping 

 root stalk, and attaining a height of about one-half inch. Stein delicate, straight, with a 

 pinched place near its base, divided into regular internodes, each of which bears a pair of hydro- 

 theese. Hydrotheca 1 tubular, strictly opposite, rather distant, adnate in front for about two- 

 thirds their length, the free distal portions being bent rather abruptly outward; margin with 

 two broad opposite teeth; operculum of two flaps. The height of the hydrotheese is usually 

 about equal to that portion of an internode that lies between the hydrothecal base and the node 

 below. There are usually four chitinous points extending downward into the cavity of the stem 

 from the bottom of each hydrotheca. Hydranths of the usual sertularian type, capable of pro- 

 truding far beyond the hydrothecal margin, as in fig. 1. 



Gonosome. Gonangia borne singly or in pairs at the base of the stem, subglobular in form, 

 with a narrow round collar and large aperture, sides beautifully and regularly annotated. 



Distribution. Charleston Harbor (McCready); Woods Hole, Massachusetts (Nutting); 

 Pourtales Plateau (Nutting): Yucatan coast, attached to an alga (Clarke); Australia (Bale). 



This beautiful species has a curious distribution, being reported only from the widely separated 

 regions noted above. There seems to be little doubt that Hale rightly identified his Australian 

 specimens, and he also was the first to describe the profusely annotated gonangia, a type rarely 

 seen in this genus. 



The Woods Hole specimens were found first by Mr. Walmsley, and, like those originally 

 described by Clarke, were always found growing on alga'. 1 am unable after careful study to 

 separate the .V. rtinijilwii, Clarke, from the present species, although I did so in ;i former work. 1 

 The characters there given are found to Intel-grade upon the examination of more material. The 

 fact that the foi'm called X. <-anii<-iii<i in that work always bore the parasitic ll<lx-ll<i <-<tlfitrnt<i, 

 while the gonangia were always found associated with the X. rumjili ,r<i of that work, even at the 

 same time of year, would render the identity of the two species doubtful. In the absence of any 

 good morphological character, however, it seems best to combine them, although I do so with 

 considerable hesitation. 



Type. Destroyed by tire in Charleston during the Civil War. 



SERTULARIA MAYERI, new species. 

 (Plate V, lifts. 1-4. ) 



Trophosome. Colony unbranched, springing from a creeping root stalk, and attaining a height 

 of about one-half inch. Stem constricted basally and divided into regular long internodes, each 

 of which bears a pair of opposite hydrotheca' on its anterior side and tapers slightly at each end. 

 Hydrotheca- with their bases a little below the middle of the internodes and contiguous for about 

 half their adcauline sides. The distal hydrotheca 5 and those in a young colony are larger in their 

 basal half and gradually narrow to a tubular distal portion which points outward and upward, 

 ending in a three-toothed margin and appressed aperture. Operculum very delicate, apparently 

 of two flaps. The proximal hydrotheca 1 are tubular, but little larger basally and bent abruptly 



1 Hydroids of the Woods Hole Region, 1901, p. 360. 



