98 AMERICAN HYDROIDS. 



SERTULARELLA MERIDIONALIS, new species. 

 (Plate XXIII, figs. 8-9.) 



Trophosome. Colony compactly pinnate in shape, attaining a height uf about 2 inches. Stem 

 not fascicled, flexuose, proximal portion not differing from the rest, not noticeably annulated, 

 divided into fairly regular internodes by oblique nodes, each internode often bearing a branch 

 and two hydrothecse on one side and a .single hydrothcca on the other. Branches regularly 

 alternate, rather closely approximated, constricted sharply at their origins, divided into long and 

 irregular internodes. Hydrothecse large, closely approximated, tubular, with both proximal and 

 distal ends expanded, both lower and upper profiles concave; about one-half of the adcauline wall 

 free; margin expanding, with three strongly developed teeth, and a three-flapped operculum. 



Gonosomc. Gonangia quite large, oblong-conical, the distal portion being ornamented with 

 three to five, usually three, pronounced annular turrets; neck small, tubular, suddenly expanding 

 distally into a trumpet-shaped termination with a round orifice. 



Distribution. Albatross Station 2783, lat. S. 51 02' 30", long. W. 74> OS' 30", 122 fathoms. 



This veiy striking species bears considerable resemblance to /S. inilit/nu, but has fewer 

 annulations and a more suddenly enlarged termination to the neck of the gonangia. The tropho- 

 some is very much more compact and robust than that of S. : i/i /'///,, ///,/, and the hydrothecse 

 are quite different in shape. 



TI/J>,.- */"/,*. Cat. No. 19767, U.S.N.M.; Cat. No. 1870!), Museum of State University of 

 Iowa; also in collection of the author. 



SERTULARELLA ELEGANS, new species. 

 (Plate XXIV, fig. ].) 



Tmj>/tofit>i>if. Colony growing from a root stalk parasitic on Ablet tnaria, and attaining a 

 height of about 3 inches. Stem not fascicled, with several strong annulations on proximal 

 portion, divided into regular internodes, each bearing a hyclrotheca, which is directed forward, 

 outward, and upward; nodes very strong and deeply cut. Branches straggling and irregular, 

 tending to an alternate arrangement, and sometimes anastomosing as in S. jJi nxf<>/it, divided by 

 deeply incised nodes into rather short, regular internodes, each of which bears a hydrotheca. 

 Hydrothecse directed forward, outward, and upward, rather closely approximated, tubular, 

 gently curved, adherent by about their proximal adcauline third; margin expanding, with three 

 strong and equidistant teeth, and with a narrow border or rim; operculum of three flaps. 

 Hydrotheciu often with an oblique intrathecal ridge running downward from the anterior 

 margin. 



Gonosome. Gonangia in rows on stem and main branches, exceedingly elaborate in orna- 

 mentation, oval to round, neck tubular with trumpet-shaped aperture, the usual annulations 

 produced into raised fluted frills that look like a series of lace collars, giving an exceedingly 

 ornate, e fleet. 



Distribution. Albatross Station 2842, lat. N. 54 15', long. W. 166 03', 72 fathoms. 



At first view this species bears a general resemblance to S. tri<'iin]>!<ltitn, but the hydrothecse 

 lie in two planes, are more crowded and heavier, and the gonangia carry ornamentation to its 

 greatest length as found in the genus. 



Ti/p, -.V//VA-.V. Cat, No. 19752, 19753, U.S.N.M.; Cat. No. 1S701, Museum State University 

 of Iowa; also in the collection of the author. 



SERTULARELLA MILNEANA (d'Orbigny). 

 (Plate XXIV, figs. 2-5.) 



Sertularia. niiliii'iitin D'ORBIGNY, Voyage 1'Amerique Meridionals, V, 1839, p. 26. 

 S,Tiiilnrillii mi/iii'iiiiii KiRciiExi'Ai'ER, Nordische Gattungen, 1884, j>. 52. 

 Sertulardla milneana HARTLAUB, Revision der Sertularella-Arten, 1900, p. l!9. 



Tropkosome. Colon}' very striking in habit, attaining a height of about 4 inches. Stem 

 proximally without hydrothecse, slender and with numerous annulations, remainder very slightly 



