80 AMERICAN HYDROIDS. 



SERTULARELLA CATENA (Allman). 

 (Plate XV, fig. :;. I 



Sn-liilirin cn/eiia ALLMAN, Challenger Report, Hydroida, Pt. '2, 1888, p. 58. 

 s,-i-iiil<u-fli<i i-iiii:ini HARTLAI-H, Revision der Sertularella-Arten, moo, p. 84. 



Tru^lioKiniii:. Colony attaining a height of about "2 inches. Stem fascicled basally and 

 simple distally, geniculate, the distal simple part being divided into regular intercedes, each of 

 which is broadened at its distal end to furnish a support for a hydrotheca. Brunches roughly 

 alternate, resembling the distal part of the stem as above described. Ilydrotheea,' subcylindrical, 

 almost wholly exserted, narrowed slightly at each end, the upper (adcauline) sides being marked 

 by shallow rugosities: margin with four shallow teeth that ate sometimes reduced to nirre 

 sinuosities; operculum imperfect in the type, but probably composed of four parts. 



CrtmiwHiic. Gonangia borne on stem opposite the bases of hydrotheca', large, terete in form: 

 orifice terminal, small, armed with two shallow processes or teeth. There is apparently a series 

 of verv shallow rugosities or anmilations on the distal portion of the gonangia. 



Disfriliitflon. Off Culebra Island, West Indies, 390 fathoms (Allman). 



An examination of Allman'' s type of this species shows that it is not identical with /?. cijlin- 

 drit /in'ii, as suggested by Hartlaub. 1 The fascicled stem, and not truly cylindrical or quadrate 

 hydrothecit, and especially the very different shape of the gonangia, show that this species is very 

 distinct from S. cylindritheca. 



The. figure here given is from the type collected by the Challenger, and differs somewhat 

 from those of Professor Allman. 



Type. In the South Kensington Museum. Fragment in the possession of the author. 



SERTULARELLA QUADRATA Nutting. 



(Plate XV, figs. 4-6.) 

 \'i-lii/iiri'l/u i/itiulriitii, NUTTING, Bahama Expedition, 1895, p. 88. 



TropJwsome. Colony attaining a height of about (i inches. Main stem sinuous, strong, 

 monosiphonic, divided into regular internodee each bearing a hydrotheca. Branches alternate, 

 each internode bearing a hydrotheca immediately at the base of which is the oblique node. 

 Hydrotheca^ very long, three to four times as long as wide, quadrate in section, margin with four 

 equal and equidistant teeth and a four-flapped operculum. Hydrotheca' often with margins 

 several times reduplicated, and a number of tine horizontal st nations on the outside of the hydro- 

 thecal walls. 



Gonosoine. Gonangia borne near the hydrothecal bases, broader and stouter than the 

 hydrotheca?, tubular, with rounded bases and distal part quadrate in section. Aperture in the 

 center of the depressed top. Margin surrounded by usually five or six long recurved horizontal 

 spines arranged so as to present a stellate appearance when viewed from above. 



Distribution. Near Habana, Cuba (Nutting): J/// ////* Station 2143, lat. N. ! :X 4.5", 

 long. W. 76 25' 30", 155 fathoms; Station 2323, lat. N. 23 In' 51", long. W. S2 lit' n3". Hi:; 

 fathoms: Station 2326, lat. N. 23 11' 45", long. AY. *2 18' 54", 194 fathoms: Station 233", lat. 

 N. 23 in' 4S", long. W. 82 19' 15". 121 fathoms; Station 2334, lat. N. 23 10' 42". long. W. 82 

 18' 24", 67 fathoms. 



This very striking form has perhaps the longest hydrotheca' known in the genus x,rfitln- 

 nlln. Its nearest ally is S. cyl !<lritli< c<i, from which it differs in the length of the hydrotheca^ 

 and also in the form of the gonangia. The reduplication of the margin seems to be here carried 

 to the extreme known in the Sertularidse. 



Ti/2>,- .sV/V/,-.v. Cat. No. 18714, Museum State Univ. of Iowa; Cat. No. 19773, 19778, U.S.N.M.; 

 also in collection of the author. 



1 Revision der Sertularella-Arten, WOO, p. S4. 



