244 University of California Publications. [ZooLocy 
1. Aetea anguina (Linneus) Lamouroux. 
Pl. IV. Figs. 1, 2, 3, and 4. 
Sertularia anguina Linn., 1758, ed. 10, p. 816. 
Cellularia anguina, Pallas, 1766, p. 78. 
Corallina anguiformis Ellis, 1767, Ger. ed., p. 50, Pl. XXII, figs. 
(as One DE 
Cellularia anguina, Ellis, 1767, p. 434, Pl. 19, fig. 10. 
Cellaria anguina, Ell. and Solander, 1786, p. 26. 
Aetea anguina, Lamouroux, 1812, Vol. III, p. 184. 
Anguinaria spatulata, Johnston, 1847, ed. II, p. 290, Pl. L, figs. 
iy. Be ; 
Aetea anguina, Busk, 1852, pt. I, Pl. XV, fig. 1. 
Aetea anguina forma spatulata, Smitt, 1867, p. 280, Pl. XVI, 
figs. 2, 4. a 
Aetea anguina, Hincks, 1880, p. 4, Pl. I, figs. 4, 5. 
Zoarium composed of creeping branches consisting of a 
single series of zoccia growing irregularly over a stem, frond, 
or other substratum (PI. IV, figs. 1, 2). Branches arising at 
right angles to the zowcia from each side of the creeping por- 
tion. Zoacia composed of a creeping posterior portion (fig. 2, 
ad.), and an anterior, erect, tubular portion (tu.). The pos- 
terior creeping portion of the zowcium narrow and tubular 
where it arises from the neighboring zocecium (ad.) gradually 
widening anteriorly or toward the growing point (gr.), then 
turning upward almost at a right angle and becoming erect 
(tu.), the remainder creeping on to give rise to a new zocecium. 
The erect portion is tubular, the lower two-thirds being minutely 
ringed, the upper one-third being somewhat inflated, and in 
many cases bent forward thus forming the so-called snake’s 
head (s. h.). At the base of the tubular portion and anterior 
to it, a septum (sep.) separates the zocecium from the one next 
following. The membranous aperture (mem. ap.) is situated 
on the ventral side of the widened upper third of the erect tube 
and at its upper edge is the movable lip or operculum (op.). 
The dorsal surface of the widened upper end of the tube is 
minutely granulated. The polypide is simple in structure, very 
minute, and when retracted is drawn downward into the hori- 
zontal, adherent portion of the zoccium (fig. 3, pd.). The 
tentacle-sheath terminates above in a circle of sete which are 
