138 



reaching nearly to the apex of the first joint of the inferior antennsB; 

 first joint long; second and third short. 



Thorax seven-jointed ; segments increasing in length posteriorly ; 

 epimerals long, broadly ovate, transversely rugose. Gnathopoda short, 

 chelate; the second pair longer than the first; carpus of first pair 

 scarcely produced anteriorly, anteriorly and inferiorly serrated ; pro- 

 podos broad, serrated on inferior margin ; dactylus half the length of the 

 propodos, arched, with a minute spine about the middle of the inferior 

 surface, antagonizing with the extremity of the carpus. Second pair 

 having the carpus more produced anteriorly than the first, extending to, 

 or slightly beyond, the apex of the propodos, and terminating in a long, 

 fine point ; propodos and dactylus similar to the first pair. First and 

 second pairs of thoracic feet shorter than the third, slender ; third and 

 fourth pairs having the coxse dilated ; the fourth more dilated than the 

 third, and the remaining joints shorter, and closely serrated along the 

 entire anterior margin — the first joint coarsely serrated, the next finely, 

 and the third intermediate between the two preceding — the other feet 

 not serrated ; fifth pair rudimentary, coxa dilated, small, with the 

 remaining joints not half as long as the coxa of the preceding pair. 



Abdomen having the three anterior segments normal, subequal ; 

 fourth and fifth fused into one ; sixth short ; the dorsal surface of each 

 segment marked by a shallow, transverse depression near the anterior 

 extremity of the joint; that on the fourth segment deeper than those 

 preceding it ; a long, acute spine, pointing upward, on each side of the 

 fifth, directly above the articulation of the outer caudal lamella. Caudal 

 appendages long, cylindrical, serrated along their inner margins, 

 biramous; outer pair longer than the two following; ultimate short, 

 reaching further than the inner. Telson long, cylindrical, extending 

 beyond the extremities of the lamellae. 



Length, .50 of an inch. 



Locality : North Pacific Ocean. Latitude 29° north ; longitude 157° 

 west. Collected June 16, 1873. 



CALANID^. 

 CALANIN^. 



CALANUS SANGUINEUS, Dana. 

 Calanus sanguineus, Dana, U. S. Expl. Exped., Crust., ii, 1070, pi. 73, f. 11. 



Locality : North Pacific Ocean. Latitude 21° north ; longitude 153^ 

 west. Collected May 21, 1873. 



