REPORT ON THE TETRACTINELLIDA. 
331 
Discodermia vermicularis, Doderlein. 
Discodermia vermiciilaris, Doderlein, Zeitschr. f. wiss. Zool., Bd. xl. p. 62, pis. v.-vii., 1884. 
Sponge. — Vermiform, consisting of long, slender, curved, dichotomising and anas- 
tomising twigs ; when the twigs are very numerous becoming shrub-like. Oscules on one 
side of the twigs somewhat elevated. 
Spicules. — Similar to those of Discodermia calyx and Discodermia japonica. 
Habitat. — Island of Enoshima, Bay of Sagami ; depth, 100 fathoms and over. 
Incertse sedis. 
Discodermia amphiaster, 0. Schmidt. 
Discodermia ampliisaster, O. Schmidt, Spong. Meerh. Mexico, p. 23, pi. iii. fig. 4, 1879. 
This is probably a Macandrewia, and . probably also identical with an already 
described species of the genus. No specimen of it exists in the collection of Mexican 
sponges returned by Schmidt to Agassiz. It is reported as having been found near 
Havanna. 
Genus 3. Racodiscula, Zittel. 
Tetracladidse with discotrisenes ; the microscleres are microrabds and spirasters ; the 
pores and oscules are simple. 
Racodiscula nucerium (0, Schmidt). 
Discodermia nucerium, O. Schmidt, Spong. Meerh, Mexico, p. 25, pi. i. fig. 4, pi. iii. figs, la-z, 
fig. 6, 1879. 
Sponge . — Small, rounded, teat-like, attached by a flattened base. Surface even, or 
produced in places into small elongate papillary processes. Oscules and pores similar, 
small, numerous, seated on slight elevations, from which small canals radiate into the 
sponge in all directions, the most superficial appearing as systems of stellate grooves 
in the denuded skeleton, and in the living sponge covered by the discotrisenes of the 
ectosome. 
Spicules . — I. Megascleres. 1. Desma, of the usual tetracladine form. 2. Disco- 
triaene, cladome more or less circular or lobate, lobes broad or narrow, according to 
position, 0‘32 mm. in diameter; rhabdome conical, rounded at the end, 0‘032 to 0’05 
mm. in length. The axial rod of the rhabdome gives off the usual three processes, 
representing the axis of three cladi where it ends in the cladome, but these are not always 
present; when they are, they vary in length from 0'004 to 0’02 mm. 3. Oxea(f). 
