432 Wisconsin Academy of Sciences, Arts, and Letters, 
Mytilia tavina Gosse, in Hudson and Gosse, Eotifera, 1886, vol. 2, p. 110, 
pi. 26, fig. 8. 
Mytilia teresa Gosse, Journ. Eoyal Micr. Soe., 1887, p. 3, pi. 1, fig. 7; 
Hudson and Gosse, Eotifera, SuppL, 1889, p. 49, pi. 31, fig. 8. 
Notommata theodora Gosse, Journ. Eoyal Micr. Soc., 1887, p. 862, pi. 14, 
fig. 2; Hudson and Gosse, Eotifera, Suppl., 1889, p. 21, pi. 31, fig. 8. 
Mytilia poecilops Gosse, Journ. Eoyal Micr. Soc., 1887, p. 869, pi. 15, fig 21; 
Hudson and Gosse, Eotifera, Suppl., 1889, p. 49, pi. 31, fig. 51. 
Mytilia producta Gosse, Journ. Eoyal Micr. Soc., 1887, p. 870, pi. 15, fig. 
22; Hudson and Gosse, Eotifera, Suppl., 1889, p. 49, pi. 31, fig. 53. 
Notommata reinhardti Hudson and Gosse, Eotifera, Suppl., 1889, p. 22. 
Biops marina Bergendal, Acta XJniv. Lundensis, vol. 28,1892, sect. 2, No. 4, p. 
83, pis. 4, 5, fig. 27. 
PleurotrocJia reinhardti Von Hopsten, Zool. Bidr. Uppsala, vol. 1, 1912, 
p. 187, fig. 1; Harking, Bull. 81 U. S. Nat. Mus., 1913, p. 85; Kozar, Zool. 
Anz., vol. 44, 1914, p. 416. 
The body is elongate, slender and spindle-shaped; its greatest 
width is less than one fourth of the total length. The integument 
is very flexible and the outline is constantly changing. The entire 
body is very transparent. 
There is a well marked transverse fold separating the head and 
abdomen. The head segment is subsquare; its length is slightly 
greater than the width. The abdomen increases rather rapidly in 
width for about one-third of its length; from this point it tapers 
gradually to the tail, which is prominent and rounded posteriorly. 
The foot is two-jointed and very long; the basal joint is short and 
stout, about one-third of the length of the terminal joint, which 
is very slender; the length of the foot is one fourth of the total 
length. It is very contractile and may be completely telescoped 
within the body. The toes are long and slender and have a char¬ 
acteristic lanceolate form; their length is one twelfth of the total 
length. 
The dorsal antenna is in the normal position; the lateral anten¬ 
nae are near the base of the tail. 
The corona is slightly oblique. The marginal wreath has lat¬ 
erally two strongly ciliated, auricle-like areas; the apical plate is 
unciliated and fairly large; the buccal field is covered with short, 
close-set cilia. The mouth is near the ventral edge of the corona. 
The mastax is of the typical form of the genus. The fulcrum is 
short, slender and tapering, its extreme end curving slightly for¬ 
ward. The rami are broadly triangular with a large basal apophy¬ 
sis and the inner margins have blunt, knoblike, interlocking teeth. 
The left uncus has a large ventral tooth, clubbed at the tip; this 
