A. E. Verrill — Marine Planarians of JSTev) England. 483 

 Leptoplana ellipsoides Girard. 



Leptoplmia ellipsoides Girard, in Stinipsoii, Invert. Grand Manan, p. 27, pi. 2, fig. 

 16, 1853; Diesing, Revision der Turbellarien, Abtheilung, Sitz. d. mathem.- 

 naturw., xliv, p. 533, 1861; Lang, Polycladen, p. 512, copy of original descrip- 

 tion. 



Pl.^TE XL, FIGURES 5, 6; PLATE XLIII, FIGURES 4, 4a, 4&. 



Description of living specirneus : — Body large, flat, rather thin, 

 usually broad-ovate or broad-elliptical, but capable of becoming 

 long-elliptical ; the edges are thin and frequently strongly undulated, 

 and are capable of being used for swimming by means of rapid un- 

 dulatory motions. 



Ocelli are small, black, and not very conspicuous ; those in the 

 dorsal clusters are larger than those in the cerebral clusters. The 

 latter are relatively rather small, somewhat elongated groups, broad- 

 est near the middle, narrowing to a point anteriorly, and containing 

 numerous (often 30 to 40) minute crowded ocelli. They are situated 

 a little forward of the other groups in usual states of the body, 

 but in some states of contraction of the anterior and dorsal region 

 they may be drawn back, so as to lie between, or even behind, the 

 dorsal groups. The dorsal groups are usually nearly circular and 

 contain numerous (20 to 25) ocelli of different sizes, some of which 

 are much larger than the rest. 



Color, various shades of dull yellowish brown, greenish brown, and 

 reddish brown, usually more or less distinctly marked with irregular 

 spots or blotches of darker brown, and with small specks of whitish; 

 a lighter colored median streak runs over the gastric region, and 

 another covers the genital region farther back ; frequently the two 

 streaks are united into a continuous median streak that extends 

 nearly the Avhole length of the body. Under surface pale grayish 

 or yellowish white, the whiter pharynx and vasa deferentia showing 

 through indistinctly. 



Length of large specimens, in extension, 25 to 35"^'"; breadth 12 

 to 20""". 



Description of mounted specimens : — The specimens mounted in 

 balsam are not sufficiently translucent to show distinctly many of 

 the internal organs, owing in part to their large size and the great 

 amount of pigment, but more particularly to the fact that the body 

 is so densely filled with ovarian and spermarian vesicles that the other 

 organs are obscured. 



Trans. Conn. Acad., Vol. VIII. 63 January, 1893. 



