378 



BULLETIN OF THE BUREAU OF FISHERIES. 



Aglaophenia minuta Fevvkes. 



Aglaophcnia minuta Fewkes. Bull. Mus. Comp. Zool., 1881, p. 132. Nuttint', American Hydroids, pt. I, 1900, p. 96. 



Trophosome. — Colony unbranched, usually from 10 to 15 mm. high, but reaching as high as 20 mm.; 

 the stolon is regularly annulated; stem with one or two oblique nodes near the base and the remainder 

 divided by transverse nodes into regular intemodcs each of which gives off a hydrocladium near its 

 distal end; hydrocladia divided into regular intemodes, each of which has two internal ridges, the 

 one at the base of the supracalycine nematophore and the other opposite the intrathecal ridge; hydro- 

 thecae short and stout, turned well outward at the distal end; margin with sharp teeth; intrathecal 

 ridge extending well across; a broad keel present which passes up the anterior surface to the top of the 



Fig. 43 



-Aglaophenia minuta Fewkes. A. portion of hydrocladium; B, hydrotheca, side view, more highly magnified; C, hydro- 

 theca, front view, more highly magnified; D, corbula. 



hydrotheca; supracalycine nematophores small, geniculate, not reaching so high as the margin of the 

 hydrotheca; mesial nematophore short, with distal end free, the free portion being partially separated 

 from the remainder by a deep constriction. 



Gonosome. — Corbulae large, borne on a modified hydrocladium, which is usually the one nearest 

 the base; corbulae short, stout, rounded, composed of 7 or 8 pairs of leaves, which meet only at the base of 

 the nematophores, thus leaving a pair of perforations for each row. Each leaf has a row of nematophores 

 and a large spine at the base. 



Distribution. — Found plentifully on the Sargassum that floated in to the seaward side of Bogue 

 Bank. 



Fig. 44. — Aglaophenia rigida Allman. A. portion of hydrocladium; B, hydrotheca, side view, more highly magnified; C, hydro- 

 theca, front view, more highly magnified; D, corbula (after Nutting), 



Aglaophenia rigida Allman. 



Aglaophenia rigida Allman, Mem. Mus. Comp. Zool.. 1877. p. 43. Nutting. American Hydroids, pt. I, 1900, p. 91. 



Trophosome. — Colonies reaching a height of 8 inches in specimens obtained but reported as high as 

 24 inches; stem simple, slender and wiry, divided into regular intemodes, each of which gives rise to a 

 hydrocladium; branches few in number, often absent, usually given off in pairs from the front of the 

 stem. Hydrocladia up to 10 mm. in length, divided into regular intemodes; two internal ridges present 

 in the usual position. The hydrotheca occupies almost the whole length of the intemode, so that there 



