I8OPODS OF NOETH AMEEICA. 



339 



also half as long as the fourth; the sixth and seventh are slightly 

 shorter than the fifth. There are two long spines on each one of the 

 thoracic segments, one on each side of the median longitudinal 

 line. The lateral parts of the first segments are broadly expanded and 

 surround the posterior portion of the head at the sides. The epimera 

 of the second, third, and fourth segments are small, but distinctly 

 separated from the segments; they occupy the antero-lateral angles of 



FIG. 367. ARCTURUS BAFFINI (AFTEK G. O. SARS). a, ANTERIOR PART OF BODY, WITH FIRST PAIR OF 



ANTENNA AND ORAL APPENDAGES VIEWED FROM BELOW, ft, FIRST ANTENNA. C, BASE OF SECOND 

 ANTENNA, d, ADULT FEMALE, FROM ABOVE, e, FIRST LEG. /, SECOND LEG. fir, POSTERIOR PART OF 

 BODY, VIEWED FROM BELOW (ONE OF OPERCULAR VALVES REMOVED), h, TWO SENSORY APPENDICES 

 OF FIRST ANTENNA, i, LABRUM. j, FLAGELLl'M OF SECOND ANTENNA, k, MANDIBLES. /, ONE OF 

 ANTERIOR PLEOPOD8. TO, TERMINAL BRANCHES OF OPERCULAR VALVE (INNER SIDE), n, SEVENTH 

 LEG. O, ONE OF POSTERIOR PLEOPODS. p, FIRST MAXILLA, q, LABIUM. r, SECOND MAXILLA. S, M.A.X- 



ILLIPED. t, TERMINAL CLAW OF SEVENTH LEG. u, LATERAL VIEW. 



the segments and are not visible in a dorsal view. The epimera of 

 the last three segments are large and also distinctly separated; they 

 project at the, sides of the segments, being produced in long, acute 

 processes, and are conspicuous from a dorsal view. 



The first two segments of the abdomen are short, and each is pro- 

 vided with two dorsal spines, one on either side of the median longi- 



