THK SKRTl'LAKIU.E. 53 



Branche- -trictly opposite. -pringing from the li\ drothecal base-. themselves sometime- branched 

 unsymmetrically, divided into regular internode- each bearing a pair of hydro|hec;e. Ilydro- 



thcca- strictly opposite, moderately distant, tubular. regularly curved. IKJI adnate to each other 



in front, strictly lateral in position, nearlx the distal half free, margin with two opposite teeth. 

 anil a two-Happed opcrculuin; aperture oval. 



(iunnsnnii-. (ionangia lionie on the fi-ont of the stein and liranehes. ovoid, with a very 

 narrow collar and liroad aperture. When mature the gouangia are often -urniounted l>\ globular 

 acrocysts. 



Itlxtriliittiiin. Almost throughout the Northern Hemisphere: Vineyard Sound (Verrill); 

 Straits of Belle Isle (Packard); Nova Scotia (I)awson): coa-i of California (( 'larkc); (ireenland 

 (Fab ricius); White Sea (Mereschkowsky); Iceland (Saemundstton); Denmark (Winther): Norway 

 (Sars); Helgoland (Hartlaub); British coasts (Hincks); Belgium (Van Beuoden): Naple.-. New 

 Zealand (Coughtrcy). 



This is one of the longest known and most widely distributed of the Sertularida'. and 

 has been the subject <>f much investigation. Perhaps the most actable study of the specie.- i- 

 that given by the older Agassi/ in his Contributions i,, the Natural Hi.-tory of the Tinted 

 States, where will be found .-ome superbly beautiful illustrations of the specie.-, part icularh it- 

 reproductive parts. (1'late XXXII.) 



SERTULARIA VERSLUYSI, new name. 



(Hat.- I. ti^. i 

 llixin(i!-i//i!iiix i/nirillx AI.I..M AN, < 'liallriiL'i'r KI'IMHI. 1 1 \ ilnml?-. I'l . '_'. I --s. j.. 71. 



li,:~i/iiiixi-i//iliiis injlatus VEK-SLCYS, llyclraircs ilc la Mcriles . \niill. -, ls;i!i, p. IL'. 



Troj>/utxo//ie. Colony growing from a creeping stolon and attaining a height of about 2 

 inches, but many specimens are not more than one-half inch high. Stem not fascicled, sinuous, 

 divided into regular internodes. each of which bears a branch and two liydrotliecie ....... ie .-ide 



and a single hydrotheca on the other; nodes oblique. Branches strictly alternate and regular, 

 undivided, projecting at nearly a right angle from the stem, and divided by straight nodes into 

 regular internodes. Hydrothecffi widely separated laterally on the stem, where they are alter- 

 nate; strictly opposite on the branches, where the pairs arc distant, heiny separated by about 

 twice the height of the hydrotheca' and borne on the front of the branch. The individual 

 hydrotheca) are short and stout, each contiguous with it- fellow for nearly its entire height, the 

 free distal ends having a horizontal upper outline and nan-owing rapidly to a .-mall bilobed 

 dorso-yentrally compressed margin. In some specimens the hydrolhei-e are much more robust, 

 each pair, with its intcrnode. making a triangular figure, a- in tig. '.. Versluys believes 

 that he found an operculum \vith a single (lap attached to the' abcauline side of the margin. My 

 own specimens appear to show two Haps, but the operciila are badly ruptured and can not be 

 interpreted with safety. 



(inniixuiin'. Not known. 



Distribution. --Off Bermuda, depth Iin fathoms (( 'Imll, /i,/, /); Cape Verde Islands. 'J."> meter-. 

 (Versluys); found on floating gulf weed (Albatross). 



An examination of Allman's type of Desrrwscyphus gracilis .-how- tliat it agrees very e\a<-tl\ 

 with the excellent desc!'iption given by ViTsluys of his l>. in rliit us. the hydrolhecje on the stem 

 being strictly alternate as in Plate 1. tig. 4. of the present work, and not oppo-ite a- figured 

 by Allman. 1'latc XXXIV. tig. 1'. 



M. Versluys was unavoidably misled by an incorrect drawing. The species is here placed in 

 the genus S, rtnl,iri<t and, as the name X/7//A//-/,/ ,//-ii<-,7/x is preoccupied. I take pleasure in 

 giving to this form the name of the first author who de-cribed and figured if correctly. 



Type iu the South Kensington Museum. London. A fragment in possession of the author. 



