A. E. Verrill — Marine Planarains of New England. 4*73 



yellowish lines and mottlings ; median dorsal stripe pale or greenish 

 white ; margin whitish ; sometimes the dark color is in the form of 

 distinct irregnlar spots or blotches ; ventral surface yellowish green, 

 with the pharynx opaque whitish. 



According to Girard the original specimens were dark gray, on a 

 pale ground, and the median stripe was reddish, — a variation similar 

 to that common in Eustylochus ellipticus. 



Length 20'""' ; breadth 10 to 12""", in extension. 



New Haven, Conn., 1805, 1870, 1892; Newport, R. 1., 1880; 

 Wood's IIoll., Mass., under stones near low- water mark, 1886 ; 

 Charleston, S. C. (Girard.) 



On the southern New England coast this species is not common, — 

 at least I have found it only in few instances and in small numbers 

 during more than twenty seasons spent in collecting marine animals 

 on these shores. Most of the specimens are immature. 



The structure of the internal reproductive organs of this species, 

 owing to its opacity and dark color, were not well made out, in the 

 adult specimen described above. Some additional observations on 

 a smaller and somewhat immature specimen, apparently of the same 

 species, recentl}^ obtained living, are here given. 



This specimen agrees with the larger and more characteristic ones 

 described above in the arrangement of the ocelli, which, owing to 

 the lighter colors of the integument, could be made out in the living 

 specimen, though they are minute. The tentacles, however, were 

 relatively smaller than in the larger specimen formerly described. 

 They are tapered, acute, translucent whitish, without ocelli except in 

 the strictly basal part, so that they can scarcely be seen from 

 above, but seen from beneath they form a small round group ; the 

 clusters behind and between the tentacles, those in the cerebral 

 region, and the marginal ocelli are nearly as described above, 

 except that they are rather less numerous. They can hardly be 

 seen with a pocket lens. Scattered, minute, marginal ocelli occur 

 even at the posterior margin. The color is light olive-green, irregu- 

 larly radiated and reticulated with rather faint, greenish white lines ; 

 margins and tentacles whitish ; a median streak over the stomach 

 and a small elliptical spot close to the posterior end, and inclosing 

 the copulatory organs, ai'e greenish white. Lower surface pale, the 

 pharynx, stomach, and vas deferens showing through as mox-e 

 opaque white organs. Mouth central ; pharynx with about six 

 main lobes on each side. 



In this living specimen the reproductive organs (PI. xlii, fig. 3) 



