86 AMERICAN HYDKOIDS. 



but evident rim mid four inconspicuous equidistant teeth which are sometimes aborted leaving 

 an even margin. The remains of an operculum can IK- seen in some cases, and this is probably 

 composed of four flaps. 



Gonoaome. Not known. 



Dititrllutlon. Griffiths Point, Port Stevens, Queen's Cliff. Victoria (Bale); Station 126, 

 south of Pernambuco, 770 fathoms (Allinan). 



An examination of Allman's type of Tlniinriu Jn/<il!na Allman shows that the species comes 

 well within the genus SertnUardla as used in the present work. The. entire structure is very 

 delicate, and the operculum is in no ease perfect. In some cases, however, it is partially intact, 

 and is probably composed of four flaps where the four low teeth are present, and of a single thin 

 membrane where the teeth are wanting, leaving a circular margin. Bale's figures and descrip- 

 tions of Tlniiiir'ni luta Bale apply so completely to the Challenger type of T. Jii/nHnn Allman 

 before me that I have no hesitation in regarding the two as identical. As Bale's species has the 

 priority, Allman's T. In/iilimi must be regarded as a synonym. 



Type. In Australian Museum, Sydney. 



SERTULARELLA ALBIDA Kirchenpauer. 

 (Plate XIX, ligs. 1-2.) 



Mertiilarelld rulnixlii, (.'I..VKK, Alaskan Hyilrnids, ]S7li, p. 22."i. 

 KiTtiilin-Mi nlliiilii, KIKCHENI'.U-ER, Nurdi.si'lu- (iattunjit-n, 1SS4, p. 42. 

 Hi'rtiilin-ellii nlliiiln, HAKTLAUB, Revision der Sertularella-Arten, 1900, p. 26. 



Trophosome. Colony attaining a height of about '2 inches, flabellate in form. Stem not fas- 

 cicled, thick, with several very deep annulations at its proximal end, internodes irregular, 

 tending to be shorter in proximal and longer in distal portion, nodes very deeply cut. Branches 

 flexuose, irregularly alternate, themselves branching, divided into irregular internodes like those 

 of the stem, very broad, resembling those of Tlmi/irin. Ilydrotheca 1 large, closely approxi- 

 mated, alternate, but on account of the thickness of the hydrocaulus appearing to be in two series 

 as in many species of Tlmiiti'in; broadly tubular, immersed to the aperture on abcauline side, 

 distal part bending slightly outward, margin with four teeth. Operculum of four flaps. An 

 intrathecal ridge originates at the bend in the abcauline side and passes downward and inward to 

 about the middle of the hydrotheca. 



GOIIIKHIII, . (ionangia axillary, very large, perhaps the largest found in the genus, ovate, 

 regularly and closely annulated with short tubular neck, and round terminal aperture. 



Dixtril'ittioii. Yukon Harbor, Big Koniushi, Shumagin Islands, 6 to .!(> fathoms. Collected 

 by AY. II. Pall (Clark). 



This very striking species has the aspect of a Tiniini'iii and would doubtless be placed in that 

 genus were it not for the four-toothed hydrothecal margin and the typical S, rfula/'*ll<t form of 

 the gonangia. These latter are very large indeed, attaining sometimes a length of nearly a 

 quarter of an inch. The description and figures are from a specimen collected by Pall at Big 

 Koniushi, Shumagin Islands. 



7}/yv. -In Museum of the Academy of Sciences, St. Petersburg. 



.'SERTULARELLA PINNIGERA Hartlaub. 



( Plato XIX, fi. ::. ) 



'I'liiiitiriii /liiiinilii A I.I.MAN, Mem. Mus. Comp. 55ool., V, Nn. 2, ls.77, p. 28. 

 ,VIT(/((;V//H .'iiiiiiiiiln HAUTI.AI-I'.. Itcvisiiiii ilcr Sertularella-Arten, 1900, p. 11 3. 

 Serlularella pinnigera HAHTLAI n, Kcvisimi der Sertularella-Arten, 1900, p. 113. 



" Trophosome. Stem attaining a height of nearly 3 inches, sparingly branched, fascicled 

 below, alternately pinnate, pinna' given off at nearly right angles to the stem, jointed at distant 

 and uncertain intervals. Hydrotheca' borne both by stem and pinna* , deep cylindrical with 

 obscurely four-toothed margin, adnate to the axis in their whole length. 



' ' (ju/i (iKinn,'. Not known." 



l>!xli-iliiit!nn. Double-headed Shot Key, 3 to 4 fathoms (Allman). 



