60 AMERICAN HTDROIDS. 



Distribution. Found on flouting seaweed on the Great Bahama Banks (Bahama Expedition 

 from the State University of Iowa). 



This species is more delicate, and the hydrothecse are more slender than in other ^pecies of 

 this group. 1 take pleasure in naming it after Professor Stookey, member of the Bahama 

 Expedition. 



T//j- xli<li*. Cat. Nos. 1SHH5, IfStititi, Mus. State Univ. Iowa; Cat. Nos. 19710, 19711, 

 U.S.N.M. ; also in collection of the author. 



SERTULARIA BREVICYATHUS Versluys. 



(Plate VI, figs. 1-2. ) 

 liri'i-iri/iitlitix VKKSI.UY.S, Hyilraircs Calyptoblastes recucillis dans la Mer <les Antilles, 1899, p. 40. 



'. Colony consisting of an unbranched stem springing from a creeping root-stalk. 

 Stem divided into regular long internodes, each bearing a pair of hydrothecae on its distal half, 

 and being enlarged at the middle to form a base of support for the hydrothecse, the proximal 

 and distal portion of each internode being narrowed. Hydrothecse strictly opposite, turgid 

 below, the inner outline being nearly a semicircle, the two of a pair being contiguous in the 

 front of the stem on account of the extent to which they embrace the latter, but they are not 

 placed in front as in typical species of the Desinoscyphus group; distal portion directed 

 outward and narrowing rapidly to the three-toothed margin; opereulum two-flapped. 

 Gonosome. Not known. 



DtKtr'ilution. -- Between Eleuthera and Little Cat islands, and near Spanish Wells, Bahamas 

 (Bahama Expedition from the State University of Iowa) ; Cape Verde Islands, 25 meters (Versluys). 

 The specimen above described was collected by the Bahama Expedition from the University 

 of Iowa. The hydrothecse are somewhat more slender distally than indicated by Versluys's 

 figures, but some, individuals agree with them exactly. 

 Type. In the collection of Comte R. de Dalrnas. 



SERTULARIA FLOWERSI, new species. 



(Plate VI, figs. 3-4.) 



Trophosome. Colony minute, consisting of a very slender unbranched stem, attaining a 

 height of about one-fourth of an inch. Stem divided into long, slender internodes by nodes 

 placed immediately above the hydrotheca. Hydrothecse very small, in strictly opposite pairs, 

 which are situated on the distal ends of the internodes, distant, placed on the sides of the stem 

 which they embrace, so as to be contiguous in front for about half their height; margin tridentate 

 with a two-valved opereulum. Inconspicuous chitinous processes extend downward from the 

 bottoms of the hydrothecse, as in S. cornicina. 



Gonosome. Not known. 



Dixti'Hiiitiiin.. Dredged near Habana, Cuba, from a depth of about 150 fathoms. Collected 

 by the Bahama Expedition from the State University of Iowa. 



This is the most slender and delicate species of Sertulai-in that the writer has seen. Named 

 in honor of Capt. Charles B. Flowers, of the Bahama Expedition. 



Type. In the Museum of Natural History, State University of Iowa. 



SERTULARIA TUMIDA Allman. 



(Plate VI, tig. 5.) 

 Serh'/'iri'i iiniiiilti, ALLMAN, Mem. Mus. Comp. Zoo]., V, No. 2, 1877, p. 23. 



" Trophosome. Hydrocaulus attaining a height of three-fourths of an inch, simple, inter- 

 nodes of moderate length, thinning away for some distance below each pair of hvdrothec;e. 

 Hydrothecse opposite, short, tumid below, adnate to the stem for about half their length, and 

 with the distal half free and diverging at nearly a right angle." 

 truiioxri/ii, . Not known. 

 Distribution. Tortugas, shallow water (Allniau). 



