488 A. K Verrill — Marine Planarians of New England. 



glions ; they are nearly parallel, not far apart, extending both behind 

 and before the brain, but diminishing in breadth over the middle 

 of the ganglions ; one or two of the anterior ocelli are usually dis- 

 tinctly larger than most of those in the clusters. The smaller but 

 more conspicuous dorsal groups, which are a little farther apart and 

 situated rather behind the ganglions, contain a moderate number of 

 rather larger ocelli, forming somewhat angular or irregularly rounded 

 clusters, while just behind each group there is usually a small de- 

 tached cluster of two, three, or more ocelli. In some specimens 

 these small clusters are not noticeable, while in others they nearly 

 blend with the main clusters. 



The mounted specimens show, also, two, three or more rows of 

 minute marginal ocelli, extending around the anterior margins, back 

 to the middle of the sides, and in small numbers even to the posterior 

 end ; many other similar minute ocelli* are scattered over the whole 

 frontal region, in advance of the cerebral groups, and some of the 

 largest of these are ranged along the main frontal nerves. 



Color, in life, yellowish flesh-color or pale ocher-yellow, lighter or 

 darker yellowish brown, etc., becoming paler and translucent near 

 the margins which are whitish ; the ganglions and main nerves are 

 pale red or pink ; the stomach has very numerous, much lobed and 

 divided branches, Avhich often show through as brown markings; 

 over the stomach and pharynx there is a whitish or pale reddish 

 streak ; behind the gastric streak there is a small elliptical whitish 

 patch over the genital organs. The ventral surface is paler and 

 shows a whitish gastric spot and the opaque vas deferens running 

 up along each side of the stomach. 



Length in life, 18 to 25™"'; breadth 10 to 15™"\ 



Description of specimens mounted in balsam : — The ocelli, in the 

 mounted specimens (PI. xliv, figs. 4^, 5b), appear more numerous 

 than in the living ones, because more of those that are situated deep 

 in the integument become visible, and consequently the shape of the 

 clusters, especially the cerebral ones, appears to be different, in addi- 

 tion to the effect of contraction. The brain (fig. oh) is only slightly 

 bilobed. The stomach-branches are so thoroughly anastomosed that 

 the body-parenchyma, as seen by translucency, appears to be ver- 

 miculated, or divided in many places into polygonal compartments, 

 in some places even having a honey-combed appearance while in 



* These small scattered and inargiual ocelli were not noticed in the living speci- 

 mens, doubtless owing to their small size. The examinations were mostly made with 

 a good pocket lens, or a dissecting microscope. 



