128 AMERICAN HYDROIDS. 



Hydrothecic normally in more than four rci\vs. 



llydrothee:e in four or six rows ..ri/liiuli-mi. 



Ilydrothecie in six or eight rows - ."''Wc/.r 



Ilydrotheiw in rows, distal ends turning alternately to tin- right and loft as in Hydrallmama. 



Hydrothec;e in four rows ..li<ii-l/<inh,. 



Ilydrothecic in two rows - ""' mitlnvi,. 



SELAGINOPSIS MIRABILIS (Verrill). 

 I Plat.- XXXVIII, tigs. 11-12.) 



nifilinxin iiiinili'ilix VERRILL, Anicr. .Icmni. Sci.. :!d ser., \', IS72, p. !). 



J>il>liiiiu niii-'iliilix VKRKILL, Trans. Conn. Acad. Arts and Sci., Ill, Ft. I, 1X75, p. is:!. 



rHjihuxiii inii-ti/iiHx ('LARK, Alaskan llydmids, 1S7H, p. -HI. 



1'oliix, -i-liix liincl;x'ii MKUESCIIKOWSKY, Ann. and Mag., 4tli SIT., XX, 1S77, p. 22s. 



iiiirnliilin XIIRMAX, Ann. and Mag., 5th ser., I, 1S7S, p. :',:!5. 

 s niii-iiliilix MKKI:SC JIKOWSKY, Ann. and Mag., 5th ser., II, 1S7S, p. 445. 



iiiii-iitiilix KmcnENPATKR, Xordisehe (iattnngen, 1SS4, p. 12. 

 s,/,n/iiiti/aix iiiirnbilix BERUII, < niplepolyper t'ra Kara Havet, 1SS7, ji. .".:!7. 

 Srrliilitriu inii-iiliilix LKVINSEX, Vid. Meddel. naturh. Foren., IS'.K!, ]>. l!i|. 

 Selayt no/ mix niii-nliilix BOXXEVIE, Xorwegisi-hc Hydniiden, IS! IS, p. 11'. 



! iiiiriiliilix XrrriNi;, Ilydroids from Alaska and I'ngct Smiiiil, IS'.l'.i, ]>. 741. 



inifiilii/is BONXEVIE, Xorwt'gian North Atlantic Exped., isini, p. s.">. 

 Selriginopsls mirnlii/ix HAHTLATH, Ilydroiden ans dem Stillen Ocean, 190], p. 355. 

 SelaginopmmirabilisfoJiKEf, Hydroida of Pacific Coast, 1'JOL', ]>. 7u. 

 Si'i'tii/iirid inirnliilin S.EMr.NDSsox, Islandske Hydroider, 11102, p. (i.'l. 



Tfiiji/Kixn/iii: Colony phnno.se, attaining a height of 4 or "> inches. Stein thick, not fascicled, 

 sinuous or weakly geniculate, without nodes for the most part, although an occasional one is to 

 be seen. A row of hydrothec-iv on opposite sides of the stem, there being three between 

 adjacent branches. Branches alternate, occasionally dividing into branchlets, with a shallow node 

 dividing them from the stem process on which they are borne and which bears two opposite hydro- 

 thecse on the proximal side of the node. Ordinarily there are no other nodes, llydrotheca' in 

 six series, immersed for only about half their length, the distal portion curving outward and 

 ending in an oval margin with two pronounced lateral teeth. Operculum of two valves or flaps. 



Gonosome. Gonangia borne on the branches, obconic when young, when mature oval, and 

 having a very broad, round terminal aperture. 



DlNtrilmtiiDi. La Have Bank, Nova Scotia (Verrill); Hagmeister Island, Bering Sea (Clark); 

 Popoff Straits, Shumagin Islands (Clark); Puget Sound (Nutting). White Sea and Polar Sea. 

 60 fathoms (Mereschkowsky) ; Polar Sea (Bergh); Norwegian Coast (Bonnevie); West Coast 

 Greenland (Levinsen); Iceland (Sa>mnndsson); AHmtr".^ Station I'.V.i'.t. lat. N. >U -I.V L'H". long. 

 W. 75 3S' 10", -25 fathoms; Station L'Sf,',. hit, N. -is : 1^'. long. W. 1'2'J 4'.)', 40 fathoms. 



This is a \QY\ well-marked species, and the only one of the genus that I have seen with 

 hydrothec;v on the process that bears the branches. 



TIJJ>C. In the collection of the V . S. National Museum? 



SELAGINOPSIS PINASTER (Lepechin). 

 (Plate XXXVI II, lig. 13.) 



Sertularia pinaster LEPECHIX ', Arta Acad. Petropolitanse, 17s:i, p. '2'2'.'>. 

 ,S', i-ln/iii-iii jiiniix (i.MKi.ix, Systrnia Xatnr.-r, I.iniurus, I7SS, p. :|S4(1. 

 Xerliiliirin jiiims Bosc, Hist, Nat. des Vers, III, 1802, p. ill!. 

 Si rliilin-iii /liiinxti-i- LA.MOI-KOUX, Hist, des Polypiers, ISlti, p. 1!)7. 

 Sertulnria pimis KIRCIIKXI-AI-KR, Nordische Gattungen, lss4. p. 11. 



''Danach erheben sich ans kriescheuden Wur/.elfasern, meist einfachc, suweilcn unten geteilte 

 cylindrische Staininclien bis (i Zool hoch. Sie sind his gegen die Mitte ihrei' Ilohe. dunkel-braun, 



'The name ,\-rl<i/<irin /liiiimln- was used for another species, m>\v fiijilmxitt /liimx/ir ( Kills and Solander), and 

 was in general use at the time that Gmelin prepared the thirteenth edition of the Systema Naturae (1788). The 

 Si ilnlnr'ni /linnxler of Lepechin was not then generally known, ami ( inielin retained the name for the N I'liilm-in /linaxli'i- 

 of Ellis and Solander, giving a new name. ,S'. /ihnix, t" I.ejieehin's spec'ies. The law of priority, however, makes it. 

 necessary to retain the name Xcrtuluriii jilnaster for Lepechin' s species, 



