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BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



Local Itie-^. — Bay of Fiindy; Massachusetts Bay; off Salem; Gulf of 

 Maine; Casco Bay; Gulf of St. Lawrence; Eastport, Maine; off Sable 

 Island; La Have Bank; South of Martha's Vinej^ard. 



Depth. — 10-487 fathoms, in nuul, gravel, stones, sand, and rocky 

 bottom. On sculpin, on cod, and on LopJiohella (Harg-er). 



Descri/pt'ioii of male. — Body oblong-ovate, 

 more than twice as long as wide, 1^ mm. :-imm. 

 Head large, a little wider than long, 1 ram. : 

 \\ mm., with the anterior margin produced in 

 a prominent rounded median lobe and the antero- 

 lateral angles acutely produced. The eyes are 

 small, round, composite, and situated at the 

 sides of the head at the base of the antero- 

 lateral lobes. The first pair of antennae have 

 the first two articles subequal; the third article 

 is as long as the first two taken together. The 

 fiagellum is composed of four articles. The 

 first pair of antennae extend to the middle of 

 the fourth article of the second antennge. The 

 first two articles of the second pair of antennae 

 are subequal; the third article is a little longer than the second; the 

 fourth is nearh' twice as long as the third. The fiagellum is composed 

 of seven articles. The mandibles are large and powerful and extend 

 conspicuously in front of the head. The palp of the maxillipeds is 

 composed of four articles. 



The first segment of the thorax is small and almost inconspicuous, 



Fig. 43. — Gnathia cerina 

 (After Harger). Male. 



€ f 



Fig. 44. — G.mathia CERINA. a, Leg of first i'air of male. \ 511. Z;, Maxilliped. x 61§. c, Second 

 antenna (male). X 51|. d, First antk.nna. x 51^. r' Mandible, x 51|. /, First leg of 



LARVA. X 51|. 



rudimentary, and consolidated with the h(»ad. The second and third 

 segments of the thoi-ax are subequal; the fourth segment is a little 

 longer than either of i\\v two preceding segments; the fifth and sixth 

 are subequal, and are both longer than the fourth segment; the seventh 

 segment is abruptly narrower than the sixth segment and is very 



