BY WILLIAM A. 11ASWELL, M.A., B.SO. 39 



intervals between which increase slightly in length distally — the 



most anterior being separated by a longer interval from the apex of 

 the rostrum than from its successor; rostrum continued backwards 

 into a non-sulcated carina, which, however, loses itself before 

 attaining the posterior border of the carapace ; on each side of 

 the rostrum a groove or sulcus, which, commencing as an obscure 

 linear depression near the tip of the rostrum, increases in breadth 

 and depth posteriorly, but becomes lost about the middle of the 

 carapace. Supraorbital spine absent ; hepatic and antennary 

 spines present ; gastro -hepatic sulcus very deep ; cervical groove 

 obsolete posteriorly. Kami of antennules short ; the internal 

 scarcely equalling in length the two last segments of the peduncle ; 

 the external somewhat longer. Grinding surface of mandibles 

 slightly excavate, with two obscure teeth; palp Particulate, 

 setiferous, phylloid, its apex blunt, and its outer border concave 

 in its distal half, nearly straight proximally, its inner border 

 uniformly convex. First maxilla with the anterior division of 

 the endopodite slender and pointed ; the others broader, truncate, 

 armed on their inner border with a series of spines. Second 

 maxillae with the exopodial portion of the scaphognathite much 

 longer than the epipodial, and strongly incurved anteriorly ; 

 endopodite having the most internal of its phylloid divisions 

 larger than the others. First maxillipedes with the inner division 

 of the endopodite rudimentary ; the squamiform plate of the 

 exopodite armed with a pointed process near the proximal end of 

 its outer border ; the epipodite sub -triangular, with the posterior 

 angle rounded. Second maxillipedes with the endopodite, when 

 extended, shorter than the exopodite. Outer maxillipedes hairy, 

 the palp short, hardly reaching to the distal end of the second joint 

 of the endopodite. Ambulatory legs increasing in length to the 

 third, which is nearly as long as the carapace and rostrum; the 

 fourth pair much shorter than the third, but equal to the second; 

 the fifth intermediate in length between the second and third. First 

 pair with a long acute spine on the under surface of the second 



