AMERICAN HYDROIDS. 



described by Clark, 1 as equal to X. </iij,i nt, ,i Mereschkowsky. I have this specimen from Dall's 

 collection from Alaska, and it is a typical >V. ^W//.;-r////W.v. The size of this species in connection 

 with the very pronounced reduplication of the hydrothecal margins, if constant, as the describe! 1 

 claims, seem sufficient characters to mark it a* a distinct species, not identical with S. polysonias, 



var. <ii<i<inti<i Ilincks or var. ri>l>nxt<( (.'lark. 



SERTULARELLA DISTANS (Allman). 

 (Plate XIX, tiw. r,-(i.) 



Tlniiin-iii ilintmiK ALLMAN, Mem. Mus. Comp. Zool., V, No. i', 1S77, p. 27. 

 i'llii ilixt'inn ll.\i:'n.\[ 'i:, Kc'xision Sertularella-Arten, lllOO, p. 100. 



TrojthiiKiini, . Colony plumose, attaining a height of about 4 inches. Stem not fascicled, not 

 canaliculated (in specimens examined by me), Hexuose, divided into regular internodes each of 

 which bears two hydrotheca' and a branch on one side and a single hydrotheca on the other. 

 Branches alternate, distant, nodes very distant or absent, divided from the stem by a deep con- 

 striction. Ilydrotheca- distant, alternate, immersed to tin? margin on adcauline side, broadest at 

 margin, gradually narrowing downward, margin with a narrow but distinct border and four very 

 low and inconspicuous teeth; operculum very delicate and hard to interpret, apparently of four 

 flaps. 



(ininixniiii'. Not known. 



I>!xti'!liiifi(in. Tortugas, shallow water (Allman); Shallow water between Eleuthera and 

 Little Cut Islands (Bahama Expedition from the State University of Iowa); Albatross Station 

 2M24, lat. N. 23 Hi' 25". long. \V. 8-'"' 20' 24", 33 fathoms; Station 2353, hit, N. 2d 5!', long. W. 

 sii 23', HIT fathoms; Station 2414, lat. N. 25 4' 30", long. W. 82 59' 15", 26 fathoms. 



Specimens collected by the Expedition from the State University of Iowa were compared 

 directly with Allman's type in the Museum of Comparative Zoology at Harvard, and were found 

 to agree. There is no doubt that this species is very near .V. lutn (Bale), but the hydrothee;e are 

 more distant in .V. distans, and the entire structure is more corneous and much less delicate and 

 hyaline. 



Type. In the Museum of Comparative, Zoology, Cambridge. Massachusetts. 



SERTULARELLA AMPHORIFERA Allman. 

 (Plate XX. lii:*. 1-2. i 



Serttdaretta amphorifera ALLMAX, Mem. Mus. Comp. Zool., V, 1S77, p. L'2. 



Si'l'lnlilfillil ilili/ilini'i/'i m Cl.AUKIO, I'.ull. Mils. Ciim]>. /no]., V, 1S7!I, ]i. 246. 



Sertularella amphvnfera HAHT[..\I'H, Kcvisimi ik-r Sertnlarella-Artfii, 1900, p. '2'.\. 



Trophosome. Colony (fragmentary) about one-third inch high, stem not fascicled, flexuose, 

 slender, dichotomously l)ranched, divided into very long internodes each of which bears a hydro- 

 theca near its distal end. Branches like the stem. Hydrotheca' tubular, long, gracefully curved, 

 adnate for about their proximal third, margin four-toothed;, reduplicated, or at least the distal 

 parts of the hydrotheca' are marked by parallel horizontal lines that seem to indicate redupli- 

 cation. 



(Jniioximi,-. "Gonangia springing each from a point near the base of a hydrotheca; obovate, 

 strongly annulated, rapidly narrowing to its point of attachment and terminating distally in a 

 conical neck, which carries on its summit a small circular orifice, with everted margin." (Allman.) 



It'txli-'iliiilimi. Off Double-headed Shot Key, 4T1 fathoms (Allman); Lat. X. 2.V 33', long. W. 

 S3 If,', till fathoms, abundant (Clarke); Allot n>xx Station 2354, lat. N. 2<i 5'.r 3d", long. W. 86 

 L'.V 33", IdL fathoms. 



The fragment from which the above description of the trophosome was taken differs from 

 Allman's description in having apparently four teeth to the hydrotheca. This may be due, how- 

 ever, to mutilation of the specimen, the hydrothecal margin being apparently worn and perhaps 

 broken. 



////" In the Museum of Comparative Zoologv. Cambridge, Massachusetts. 



1 Alaskan Ilydrui.ls, 1870, p. 224. 



