410 A. E. Verrill — Marine Neinerteans of New JEnigland, etc. 



Tetrastemma dorsale, variety marmoratum (Clap). 

 Plate xxxiv, figure 14. 



Body terete, somewhat elongated in extension, obtuse at both 

 ends. Proboscis large, protruded from the sub-terminal pore, 

 thickly covered with papilla. Color pale olive-brown, or chestnut- 

 brown, irregularl}^ mottled and blotched with darker brown. 



Length IS'"'"; diameter 1-5'"'". Described from life (No. 735). 



Portland, Me., in 2 to 3 fathoms, harbor mud, July 28, 1873. 



A paler colored race, probably closely related to this variety, was 

 taken in the harbor of Eastport, Me., in 12 fathoms, in 1872 (No. 

 507). The body was chan^able in form, usually nearly cylindrical, 

 and obtuse at both ends. Ground-color pale yellow or salmon, thickly 

 blotched and mottled with dark brown, or greenish brown ; some 

 specimens bad an inconspicuous ring of yellowish white around the 

 neck. Length 15 to 18'"'"; diameter 1-25 to 2"^'". 



Tetrastemma dorsale, variety unicolor A^erriii, nov. 



A specimen taken in Eastport Harbor, off Friar's Head, in 18 

 fathoms, August 20, 1870, agreed, with this species in form but 

 differed so much in color that it probably ought to be considered 

 as representing a distinct variety, at least: — 



Body moderately slender, slightly depressed, with the sides 

 rounded. Head obtuse, four distinct black ocelli. Color, above, 

 uniform dark fuscous brown; lower surface paler. 



Another specimen taken in 1879, according to the notes made 

 from life, probably belongs to the same variety: — 



Body moderate in extension, broadest at or behind the middle, 

 tapering to both ends, not very slender. Ocelli well developed, the 

 two pairs, when the head is extended, wider apart than the distance 

 between those of the same pair. A very distinct transverse fossa, 

 on each side of the head, runs upward and backward just in front 

 of the posterior ocelli, but the two do not meet on the middle line. 



Color of the body, above, clear brown, the margins, head, and 

 under surface paler. 



Length 8"""; breadth 1'"'". 



Station 331, off Cape Cod, in 28 fathoms, 1879. 



