THE SERTULARIDJE. 97 



SERTULARELLA FILIFORMIS (Allman). 

 (Plate XXIII, figs. 1-::. i 



,s, i-iii/iii-i/i jlliforiiii.t ALLMAN, Challenger Report, Ilydroida, Pt. 2, 1888, pi. xxiv, tig. 1. 

 Si-rliitin-iii t/nicilix ALLMAN, Challenger Ufpurt, Hyilroiila, 1't. 2, 1SSS, p. fil. 

 Sertulnri'llii filifiiniiix HAUTLAI'II, Revision der Sertularella-Arten, 1900, p. L'.'i. 



:-. Colony of graceful and delicate texture, attaining a height of 5 inches. Stein 

 not fascicled, slender, flexuose, divided into irregular internodcs. Branches not flcxuose, alter- 

 nate. themselves often branching like the. main stem in an alternate manner, and sometimes 

 these branches again divide; internodes irregular, each hearing a hydrotheca or a hydrotheca 

 and hranchlet on distal portions of colony, while the nodes are generally lacking on proximal 

 parts. Ilydrothecte tulmlar, gracefully and regularly curved outward, with about their distal 

 third free, and an oblique intrathecal ridge; margin with three well-defined teeth, and an oper- 

 culum composed of three parts. 



Gonosome. Gonangia borne on the stem and branches in all their ramifications, elongate- 

 oval, with rather long curved pedicels, and a series of very deep compressed annular ridoes 

 extending much beyond the general surface, like a series of superimposed dinner plates, the 

 uppermost being bowl-shaped, and giving origin at its center to a long, slender, tubular neck, 

 which is slightly expanded at both ends. Aperture small. 



Dixti'!l>i.it!<i. Port Famine, Patagonia, hit. S. 53 37', long. W. Tit 5<i'. it fathoms. 

 (Allman.) 



The above description is from a portion of Allman's type, which differs from the original 

 description in having three well-marked hydrothccal teeth, instead of two. The species is 

 evidently allied closely to A'. fri<-iixj>i<I<it(i^ but differs in the shape of the hydrothecse and 

 gonangia. 



Tyj/e. In South Kensington Museum, London; also in collection of author. 



SERTULARELLA QUADRIFIDA Hartlaub. 



(Plate XXIII, ligs. 4-7.) 



Thniin-iii ijiiiiilriiji-iis ALLMAN, Challenger Report, Ilyilroida, Pt. 1', 1SSS, p. 66. 



.'Kffliiliiri'lln (i/llnix HAKTL.UH, Revision der Scrtnlarella-Arten, I'.MlO, p. 4o. 



X i-iiilari'/lu ijiiiiili-ljiiln, new name', HAHTLAI-B, Revision der Sertularella-Arten, 1900, p. 120. 



. Colon}' attaining a height of about -! inches. Stem not fascicled, flexuose, 

 divided into regular internodes, each of which bears a branch and two hydrotheca 1 on one side 

 and a single hydrotheca on the other. Branches regularly alternate, themselves often branching 

 dichotomously, internodes very long, the nodes often being entirely wanting. IIydrotliec;e 

 rather distant, small, adnate to the branch by more than half their adcauline side, the free portion 

 forming an acute angle with the branch; margin with three teeth, instead of four, although an 

 appearance of four teeth is sometimes produced by a reduplication of the margin on the adcauline 

 side, which reduplicates the single adcauline tooth; oporeuluni of three flaps. 



(lii/iiixiniic. Not known. 



Dixtr;i>iit;<i. Between (Jape Virgin and Falkland Islands, hit. S. :, 1 M5', long. W. 1)5 ' 39', 

 70 fathoms. 



The above description is taken from Allman's type collected by the Clmll, m/, /. Of course 

 the presence of three instead of four teeth renders the name ijnii/l i-iriili misleading, but it seems 

 preferable to preserve the name even at the expense of incongruity. 



Hartlaub finds that the name originally given to this species by Allman was preoccupied 

 by Bale in 18S4V 



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



1 Catalogue of Australian Ilydmid /oi.pliytes, Sydney, l.ssl, p. 11U. 



