254 BENNITT. 



terminal apertures, and their comparatively large size, make this gono- 

 some, previously undescribed, distinct from that of any other American 

 species of Antennularia. 



Genus Lytocarpus. 



Lytocarpus clarkei Nutting, 



Nutting, 1900, p. 124, pi. 32, figs. 5-7. 



Large colonies of Lytocarpus clarkei, measuring from 100 to 300 mm. 

 in length, were dredged at five stations on Challenger Bank, in 31-70 

 fathoms. The gonosome is absent, but the trophosome agrees com- 

 pletely with that described by Nutting. The color of the perisarc in 

 the preserved specimens varied from light brown to deep chocolate- 

 brown. 



Lytocarpus philippinus (Kirchenpauer). 



Aglaophenia philippina, Ivirchenpauer, 1872, Pt. 1, p. 45, Taf. 1, 2, Taf. 7, 



fig. 26. 

 Lytocarpus phiUppinus, Nutting, 1900, p. 122, pi. 31, figs. 4-7. 

 Lytocarpus philippinus, Congdon, 1907, p. 484, fig. 37. 

 Lytocarpus philippinus, Fraser, 1912, p. 379, fig. 45. 

 Lytocarpus philippinus, Stechow, 1919, p. 132. 



An immature colony, about 25 mm. high, was taken on Sargassum 

 at Somerset Bridge. The gonosome was absent. 



Genus Monotheca. 



Monotheca margaretta Nutting. 



Nutting, 1900, p. 72, pi. 11, figs. 1-3. 

 Fraser, 1912, p. 380, fig. 47. 



Several colonies in good condition, 6-12 mm. high, were found on 

 floating Sargassum. The gonosome is unknown; the trophosome 

 agrees in detail with that described by Nutting. 



Genus Plumularia. 



Plumularia diaphana (Heller). 



Anisocalyx diaphanus, Heller, 1868, p. 42, tab. 2, fig. 5. 

 Plumularia alternata, Nutting, 1900, p. 62, pi. 4, figs. 1, 2. 



