A. E. Yerrill — Marine Plannrians of New England. 509 



A rudimentary pharynx. Otocyst single, near the anterior end. 

 Otolith usually well developed. No ocelli. Frontal glandular 

 organs present. 



Genital apertures, posterior; the male behind the female. Sper- 

 marian folicles numerous, lateral. Openings of the bursa semlnalis 

 without chitinous parts. Ovaries paired, lateral. 



Aphanostoma diversicolor CErsted. 



Kroyer's Naturhist. Tidssk., ser. 2, vol. i, p. 417, 1845; Cams. op. cit., p. 139; 

 Graff, Monogr., p. 220; Graff, Turbell. Acoela, p. 59, pi. 5, fig. 4, 1891, section. 



A2ihanostomwn diversicolor Jensen, Turbell. ad Lit. Norvegife, p. 26, pi. i, figs. 12 

 to 21, 1878, anatomy. 



Plate xlii, figure 8. 



Body very changeable, in extension usually long-oval or elliptical, 

 obtuse anteriorly, or tapering to both ends, but most so posteriorly; 

 only a little depressed; in contraction short-ovate and thick. 



Color variable, generally with a sulphur-yellow spot on the ante- 

 rior end and another oq the back; a large spot of bluish or viola- 

 ceous usually covers more or less of the back, and is sometimes 

 divided posteriorly by a V-shaped white line ; lateral borders 

 whitish. Mouth subcentral beneath. A cluster of frontal glands 

 is connected with a pore at the anterior end of the body. Otocyst 

 small, much obscured by the pigment, gibbous, situated at about 

 the anterior eighth. 



Length, in extension, To to 2"^'"; breadth 0-25 to 0-.35'""\ 



Newport, R. I., July 29, 1880, among algffi at low- water mark. 

 It occurs on the coasts of Norway and Great Britain, and in the 

 Mediterranean at Naples, Trieste, etc. 



Aphanostoma aurantiacum sp. nov. 



Plate xlii, figures 10, \0a. 

 Body long-ovate in extension, depressed, broadest in front of 

 the middle, usually bluntly rounded anteriorlj^ but very soft and 

 changeable. Otocyst rather large, conspicuous, situated at about 

 the anterior eighth, gibbous, containing an inverted cup-shaped or 

 bell-shaped otolith, situated at the anterior side of the nearly circu- 

 lar and transparent vesicle. The otolith is almost continually in 

 motion, while living. Ground-color light ocher-yellow, everywhere 

 thickly covered with small, distinct spots or specks of bright orange- 

 red, thus giving the whole surface an orange-yellow color, paler 

 towards the margins. Reproductive organs are unknown. 



