THE PLUMULARIDJE. 91 



The corlmla does not always present so striking a "beak" as is seen in the illustration in 

 Allman's work. The species is a well-marked one, however, especially on account of the numerous 

 septa in the hydrocladial internodes. 



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



AGLAOPHENIA CALAMUS Allman. 



(Plate XXIV, ligs. 9-11.) 

 Aglaopltenia calamus ALLMAN, CJiuUem/er Report, VII, Pt. 20, p. 39. pi. xn. 



Ti-ophoxome.^ Colony attaining a height of about 5 inches; stem monosyphonic, simple, or 

 with a few branches springing from its anterior aspect ; hydrocladia rather close, about two-tenths 

 of an inch in length. Ilydrotheca- with the margin deeply serrated; intrathecal ridge short, near 

 the floor of the hydrotheca; mesial nematophore adnate to the walls of the hydrotheca for about 

 half their height, and then continued as a short spur-like process, which does not reacli the level 

 of the hydrothecal margin; lateral nematophores somewhat flask-shaped, slightly overtopping 

 the margin. 



Gonnsome. Corbula rather long, cylindrical, with about seven pairs of adnate costa-, each 

 costa carrying four or five tubular denticles, and with a spur-like denticle at its base. 



Dredged off B.Uiia, from a depth of 10 to 20 fathoms. 



This species greatly resembles A. rigida Allman, from which it differs, judging from the 

 figures, in having stouter hydrotheca-, longer supracalyciue nematophores, and a much less 

 number of corbula ribs with larger and less numerous nematophores. 



Type. In the South Kensington Museum, London. 

 > 



AGLAOPHENIA RIGIDA Allman. 

 (Plate XVIII, figs. 3,4.) 



Aylaoplienia rii/idtt ALLMAN, Mem. Mue. C'oirjp. Xool., 1877, V, No. 2, p. 43, pi. xxv. 

 iiiiin rii/iita CLAICKK. Hull. MHS. Comp. Xool.. 1S70. V. \o. 10. p. 248. 



Trophosome. Colony much branched, slender, attaining a height of 24 inches ; stem not fascicled, 

 very slender and wiry, giving off branches usually in pairs from the front of the stem, divided into 

 iuteruodes, each of which supports a hydrocladium on a process near its distal end; hydrocladia 

 short (especially in specimens from the Atlantic coast of the United States), divided into regular 

 internodes, which are shorter than in the preceding species and have two short internal septa, 

 one opposite the intrathecal ridge and another below the supracalycine nematophores. Hydro- 

 theca? closely approximated, stout, with deep concavity in the anterior profile, and having about 

 eight strong, deeply cut, marginal teeth: intrathecal ridge short; supracalycine nematophores 

 about reaching the top of the hydrotheca; mesial nematophore with its distal portion widely 

 separated from the hydrotheca, stout, reaching about to the level of the middle of the hydrotheca. 



Gonosome. Corbula long, cylindrical, with twelve to fourteen pairs of leaves when mature; 

 leaves closed, each with a row of nematophores along its distal edge and a stout short spur at its 

 base. 



JMstribution. Off' Cape Fear, Florida; depth, it fathoms; Jilalr, 10 miles north of Zoblos Island, 

 lat. K. 24- 8', long. W. 28 51'; depth, 339 fathoms; Albtitronn. numerous stations from lat. N. 22 

 to lat. N. 30, usually in less than 100 fathoms; State University of Iowa Expedition, Station 28, off 

 Sand Key, Florida, 110 fathoms. 



Numerous specimens from the coasts of the Carolinas in the region south of Hatteras are very 

 long and slender, with short hydrocladia. This species appears to be the most abundant Aglao- 

 plicnia on our Atlantic seaboard, great quantities having been secured by the IT. S. Fish Commission 

 dredging expeditions. The trophosome is difficult to distinguish from that of A. gracilis Allman, 

 but the colonies are much larger and the hydrothecie stouter and more closely set than in that 

 species. 



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



'Original description quoted entire. 



