440 A. E. Verrill — 3Iarine Nemerteans of JVeio Em/land, etc. 

 Cerebratulus luridus Veniii. 



Meckelia lurida Verrill, Report ou Invert of Vineyard Sound, etc., p. 33U [630], 



1873. 

 Cerebrattilm luridus Verrill, Check List Invert., p. 12, 1879. 



PLATE XXXVl, FIGURE 3 ; PLATE XXXVII, FIGURE 3. 



Body large, rather stout, very changeable in form, broad, flat, 

 thin posteriorly, where the lateral cteca and reproductive organs are 

 developed ; these diminish anteriorly and do not extend forward 

 into the narrower, rounder, and thicker portion which occupies 

 nearly one-fourth the whole length. Head very changeable, often 

 separated from the body by a constriction ; in expansion often 

 spade-shaped, obtuse, or pointed. Lateral cephalic slits very long and 

 deep ; in front they are connected together by a shallow furrow, 

 above the proboscis-pore. Mouth large, usually in the form of a 

 long slot, commencing about opposite the posterior end of the lateral 

 slits. Proboscis long and slender. Caudal papilla small, slender, 

 acute. 



Color reddish brown to dark olive-brown, chocolate-color, or 

 purplish brown, darkest anteriorly, and with pale margins ; the 

 cfecal lobes of the intestine show through the integument as dull 

 brownish or ocher-yellow transyerse bars ; usually there is a brown 

 or reddish median dorsal line, and a pale ventral line. Some dark 

 specimens are marked with several narrow lighter reddish or pur- 

 plish longitudinal lines. Young specimens are usually reddish brown 

 or liver-brown with paler snouts. 



Length 150 to 250"""; breadth 8 to 12'"'", Described from life, 

 (No. '723). 



Off Gay Head, 19 fathoms, soft mud, 1871 ; off Buzzard's Bay, 25 

 fathoms ; and off Block Island, 29 fathoms, sandy mud, 1871 ; Casco 

 Bay, 10 to 68 fathoms, 1873 ; Massachusetts Bay, in many localities, 

 1877, 1878, 1879, in 10 to 100 fathoms; Bay of Fundy ; off Hali- 

 fax, N. S., etc., common ; off Martha's Vineyard, 192 fathoms, 1883. 

 Numerous specimens of various sizes from 1 to 8 inches long were 

 taken in Cape Cod Bay, in 15 to 21 fathoms, soft mud, Aug. 29, 1879. 

 The larger ones were filled Avith eggs. 



