464 A. E. Verrill — Marine Planarians of Neio England. 



convoluted, opaque white organ, on each side. Shell glands show 

 through faintly as a cloudy cluster of grayish white, slender, 

 branched, radiating tubes. The other reproductive organs show 

 only obscurely in adult living specimens, owing to the opacity and 

 thickness of the integument. The interior throughout most of the 

 body is filled with great numbers of ovarian eggs. 



Color, above, j^ellowish brown, umber-brown, or chocolate-brown, 

 crossed by numerous j'ellowish or whitish lines and stripes, of Avhich 

 tliere are sometimes at least fifty, while many other similar but nar- 

 rower and shorter stripes run in from the margins, between the main 

 ones, usually narrowing and disappearing before reaching the middle 

 of the body ; toward the ends of the ho^j the light stripes diverge 

 more and more till those of opposite sides form v-shaped markings 

 at each end, with a small median wliite stripe at the extreme end. 

 Sometimes the light stripes become wider as the}^ approach the 

 middle of the back, as in the specimen figured on Plate xl, fig. 3. 

 Some examples show an ill-defined median pale sti'ipe posteriorly. 

 The under side is mostly pale buff, except close to the margins, 

 which show the alternation of brown and white stripes by trans- 

 lucency ; the pharynx, stomach lobes, and vas deferens are opaque 

 Avhite in life, and show distinctly on the Aentral side. Described 

 from adult living examples. 



Length, in life, 30 to 40""" ; breadth 10 to 12""" or more. 



Wood's Holl, Mass., on piles, and on the shore of Great Harbor at 

 low-water, 1882 ; Vineyard Sound, off Menemsha, in 10 to 12 

 fathoms, September 6, 1886. Several fine specimens were taken on 

 oyster beds in Long Island Sound, off New Haven, by Mr. Gilbert 

 Van Ingen, October 29, 1892. These were all found in the canals of 

 dead shells of Fulgur that were occupied by hermit crabs [EiqKigu- 

 rus polHcaris). Some of those previoush' taken in Vineyard Sound 

 were living in the same situation. 



Owing to the density of the pigment and the opacity of the tis- 

 sues, I have not been able to make out satisfactorily the structure of 

 the reproduction organs in this species, without sections, for which I 

 have not j^et had sufficient material in good preservation. There 

 are, apparently, two small genital ])ores situated a short distance apart 

 and relatively farther forward than in our other species of this family. 



This species can always be recognized at once by its peculiar and 

 conspicuous colors. It is, also, the largest planarian commonly 

 found on our coast. The color is usually recognizable, even in alco- 

 holic specimens, as well as in those mounted in balsam as translucent 



