A. K Verrill — Marine Nemerteans of Neio England, etc. 401 



longer than broad, narrowed anteriorly, obtuse or slightly emar- 

 ginate, with a terminal proboscis-pore. Ocelli numerous, forming 



Fig. 4. Amphiporus agilis. Outline, enlarged. 



a long, crowded, lateral row or group along each side of the head; 

 the rows are simple and convergent anteriorly, posteriorly they 

 become broader and double. Back of the ocelli there is a curved 

 transverse groove or fossa, crossing the back of the head. No 

 anterior fossoe were observed. Color pale ocher-yellow ; median 

 dorsal line slightly reddish ; the internal lateral organs lighter 

 yellow, giving a reticulated appearance to the sides. 



Length 25™"' to 40""'; diameter 1-5"'™ to 2™"\ Described from 

 life (No. 546). 



Casco Bay, 20 to 65 fathoms; Bay of Fundy, 10 to 90 fathoms; 

 Massachusetts Bay and off Cape Cod, 12 to 60 fathoms. 



This species is very active and restless. It creeps with a rapid 

 gliding motion, frequently moving its head from side to side, and 

 in confinement is apt to creep above the edge of the water and 

 perish by drying up. It secretes mucus abundantly and forms 

 tubes of that material. It also creeps on the surface of the water, 

 back downward, like most of the species of Tetrasternma, which it 

 closely resembles in habits. 



AmphiporuS bioCUlatUS ? Mcintosh. 



Plate xxxiv, figures 3, 4, 15. 



Body rarely more than 1*5 inches long, soft, changeable in form, 

 in extension usually rather short and thick, roundish, tapering only 

 slightly toward the ends, which are usually obtuse ; the posterior 

 region is sometimes broader; head not wider than the l)ody, not 

 distinctly defined, in extension tapering to the front end, which is 

 usually subacute ; ocelli two, forming a pair, close together and 

 near the front margin of the head. A pair of small, rather faint, 

 anterior transverse fosste passes upward and forward on the sides 

 of the head, just back of the eyes, usually showing only as pale 

 lines, apparently not meeting dorsally. 



Color dark orange-red, varying to pale orange and salmon, with 

 paler margins and ventral surfaces and usually with darker brown- 

 ish mottlings along the sides posteriorly, due to the internal organs; 



