96 AMERICAN HYDEOIDS. 



SERTULARELLA SIEBOLDI Kirchenpauer. 

 (Plate XXII, figs. 6-7.) 



Sertularella sieboldi KIRCHENPAUEE, Nordische Gatfungen, 1884, p. 49. 

 Serlulanlla sieboldi HARTLAUB, Revision der Sertularella-Arten, 1900, p. 69. 



Trophosome. Colony small, branches profuse and irregular. Stem not thicker than the 

 branches, slender, gnarled, twisted, and annulated, those internodes bearing branches being 

 generally separated by internodes without branches. Branches partly quite regular and partly 

 irregular, springing from the sides of hydrothecse. HydrothecsB arise from the flexures of the 

 stem, sometimes closely approximated, sometimes distant, very irregular, pitcher-shaped, 

 swollen, with slender necks and three-toothed apertures. 



Gono&omc. Gonangia oval, deeply annulated above and below. Aperture with three teeth; 

 neck slender. 



Distribution. Cuba. 



In the absence of specimens the above description was compiled by combining points given 

 by Kirchenpauer and by Hartlaub, who studied the type specimen. 



Kirchenpauer 1 s drawings are evidently from dried specimens, or else the annulations, etc., 

 are greatly exaggerated, as claimed by Hartlaub. At any rate, no one would suppose that the 

 drawings given by these two authors were from the same species, much less the same type 

 specimen. 



Type. In museum at Leipsic. 



SERTULARELLA SUBDICHOTOMA Kirchenpauer. 

 (Plate XXII, figs. 8-12.) 



Srrliilarrlln subdichotoma KIRCHEXPAUER, Nordische Gattungen, 1884, p. 46. 

 Sertularetta subdichotoma BALE, Trans. Royal Sc>r. Victoria, 1887, p. 107. 

 Serhdarella subdichotoma HARTLAUB, Revision der Sertularella-Arten, 1900, p. 33. 



Tropliosome. Colony exceedingly straggling and irregular in growth, sometimes attaining 

 a height of about 2 inches. Stem not fascicled, branching dichotomously, but in a very loose and 

 straggling manner. Stem and branches not divided into regular internodes in the proximal por- 

 tions, but distally divided into long slender internodes, each of which bears a hydrotheca. 

 Hydrothecse small, varying greatly in shape, usually rather distant, short, attached for more 

 than two-thirds their adcauline side, the free portion being abruptly narrowed; margin usually 

 with three broad equal and equidistant teeth; operculum of three flaps. There is often an oblique 

 or horizontal intrathecal ridge. 



Gonosome. Gonangia slender, ovoid, annulated rather feebly, with a distal flange-like outer 

 collar and a slender neck ending in a round aperture. In some cases there is no outer collar nor 

 inner neck, but a broad, round terminal aperture as figured by Kirchenpauer. 1 



Distribution. Bass Straits. Australia (Kirchenpauer); Straits of Magellan (Kirchenpauer); 

 Patagonia (Hartlaub); Allxtro** Station 2776, lat. S. 52 41', long. W. 69 55' 30", 21 fathoms. 



This appears to be an exceedingly variable species in almost every detail of its structure. 

 Specimens from Station 2776 agree well with one sent me by Professor Levinsen from the Straits 

 of Magellan. The gonosome, as well as other parts, is very variable, and some of the gonangia 

 resemble Kirchenpauer's figure, and others the original figure of d'Orbigny for S. milneana. 2 



Type. In the Berlin Museum. 



1 Nordische Gattungen und Arten, 1884, pi. xvi, fig. 1, /. 



2 Voyage dans PAine'rique Meridionale, 1839, p. 26, pi. xi, fig. 8. 



