A. E. Verrill — Marine Planarians of N'ev England. 507 



Tentacles whitish, when extended a little elongated and tapered to 

 a point, but capable of complete retraction and usually not visible 

 in preserved specimens, though their position ma}^ be indicated by 

 small white spots; they are situated near the antero-lateral margins 

 of the head, but not on the margins. Eyes rather large, black, but 

 not easily seen, owing to the dark color of the integument.* Mouth 

 submedian. 



Pharynx, as retracted in mounted specimens, long, rather narrow, 

 cylindrical, equal to a third, or even nearly half the length of the 

 body, its posterior end reaching back to about the posterior fourth 

 of the body. 



Color, above, dark smoky brown or blackish, often with a more 

 or less distinct stripe of light gray or yellowish white along each 

 side of the back, sometimes mottled with darker and lighter brown; 

 beneath paler; tentacles and margins of head whitish. 



Length 4 to 6™"^; breadth 1 to IS""". 



New Haven to Bay of Fundy. Point Judith, R. I., (Leidy) ; Man- 

 chester, Mass., (Girard). I have collected it at New Haven, Conn., 

 Newport, R. I., Wood's Holl, Mass., Casco Bay, Me., etc. It is 

 found also on the northern coasts of Europe. Found near low- 

 water mark under stones, and in tide-pools, among algie. 



This species is active in its habits. It has a singular resemblance 

 to some of the small land slugs in form and mode of progression. 

 Its egg-capsules are unknown to me. 



Part II. — Accela. 



The acoelous planarians of our coast have, hitherto, received but 

 little attention. Besides the few species noticed below, I have 

 observed several others, but not with sufficient care to enable me 

 to give satisfactory diagnoses. Some of the species are very com- 

 mon among algae and eel-grass in shallow hax-bors. 



The Accela are remarkable for the absence of any distinct mem- 

 brane lining the digestive cavity, so that no distinction can be made 

 between the body-cavity and digestive cavity. This cavity is lined 

 with a loose celhilar parenchyma and has an indeterminate outline; 

 it is often very large and usually filled with large numbers of small 

 crustaceans, diatoms, and various other organisms. 



The mouth is often at, or near, the anterior end of the body, but 



* The eyes are not distinctly shown in the figure (pi. XLi, fig'. 10). owing to the 

 dark shading. 



Trans. Conn. Acad., Vol. VIII. 66 January, 1893. 



