480 A. JEJ. Verrill — Marine Planar ions of JVew England. 



numerous "shell glands" {w) which radiate outward and back- 

 ward from it. The outlines and connections of the large uterine 

 sacs, which also join the vagina, cannot be distinctly seen, but they 

 lie alongside the stomach, and are filled with eggs. The vas def- 

 erens also runs up along each side of the stomach as a convohited 

 tube. 



Off Cape Cod, at Station 307, in 31 fathoms, 1879 ; also at Sta- 

 tion T4V, off Nantucket Shoals, in \3^ fathoms. 



Leptoplana variabilis (Girard) Diesing. 



Polyscelis variabilis Girard, Proc. BostoD Soc. Nat. Hist., vol. iii, p. 251, 1850. 



Leptoplana variabilifi Diesing, Revision Turbell., Sitz. mathera-nat., xliv, p. 542, 



1861. 



Plate xli, figure 7 ; Plate xliii, figures 2, 2a, 3, 3o, 3b. 



Descri^ytion of living specimens: — Body thin, smooth, oblong or 

 elliptical in extension, with the edges usually much undulated ; very 

 active and changeable in form. 



Ocelli black and conspicuous; the cerebral clusters, which are sit- 

 uated over and in front of the ganglions, are decidedly elongated, 

 usually fusiform and distinctly widest in the middle, but sometimes 

 widest at the front end, subparallel or more or less divergent, and 

 changeable in position according to the extension or contraction of 

 the tissues about them ; the hind end often extends as a narrow line 

 or single row of ocelli back of the dorsal groups ; the cerebral 

 clusters may contain 25 or 30 ocelli each. The posterior or dorsal 

 clusters are more or less circular or oval, each containing ten to 

 fifteen rather large, conspicuous, black ocelli ; a few of those in front 

 are usually larger than the rest. 



Color often yellowish brown, becoming paler toward the translu- 

 cent margins and darker around the light gastric streak. The gan- 

 glions and nerves are not red. 



Other specimens (as No. 736) are light salmon or light yellowish 

 brown, thickly spotted with darker orange-brown, and with an inter- 

 rupted pale streak over the sloraach and reproductive organs. 



Length of the larger specimens 12 to 18"'"; breadth 4 to 8""". 



Description of specimens mounted in balsam : — The tissues are 

 thin and fairly translucent. The pharj^nx has a large anterior, and 

 a small short posterior lobe, with six principal lobes on each side^ 

 The mouth is neai'ly in the middle of the pharynx, but in advance 

 of the middle of the bod}^. 



In the larger examples (PI. xliii, figs. 3 to 3b) the greater part of 

 the body is filled Avith numerous ovarian and spermary vesicles, the 



