450 



BULLETIIT 15 8, UNITED STATES NATIOlSrAL MUSEUM 



\ 



Color. — Body a uniform yellowish gray, turning to brown in pre- 

 servatives. 



Female. — Body elongate and narrow; carapace with large lateral 

 flaps turned ventrally and hiding the antennae and mouth parts in 

 lateral view. Anterior portion of dorsal plate twice as long as wide, 

 posterior portion much widened at the posterior margin, and 

 wrapped around the fourth legs leaving only the tips of the latter 



visible. Genital segment small Avith 

 strongly convex sides; abdomen 

 minute, 1-segmented; caudal rami 

 narrow lanceolate, as long as the abdo- 

 men and genital segment combined, 

 but not reaching the posterior margin 

 of the dorsal plate. Fifth legs rudi- 

 mentary stumps, concealed both dor- 

 sally and ventrally; first antennae 

 6-segmented, and sparsely setose. 

 Total length, 9-9.5 mm. Length of 

 egg strings, 16.75 mm. 



Mai e. — Cephalothorax elliptical, 

 narrowed anteriorly, second segment 

 as wide as the head; third segment 

 enlarged through the bases of the 

 third legs, which extend outward at 

 a wide angle with the body axis; 

 fourth segment also widened through the bases of the fourth legs, 

 which extend diagonally backward at an angle of 45°. 



Third and fourth legs biramose, the endopods much smaller than 

 the exopods ; caudal rami cylindrical, divergent, bluntly pointed and 

 unarmed. Total length, 2.25-2.5 mm. 



Remarks. — This species can be readily identified by the long skirt, 

 or posterior portion of the dorsal plate, wrapped around the e,gg 

 strings. 



LERNANTHROPUS POMATOMI Rathbun 



FiGtJUE 283 



Lernanthropus pomatomi Rathbun, Proc. U. S. Nat. Mus., vol. 10, p. 567, pis. 

 33-35, 1887.— Wilson, Proc. U. S. Nat. Mus., vol. 60, art. 5, p. 42, 1922. 



Occurrence. — Found in abundance upon the gills of the common 

 bluefish in the Woods Hole area. 



Distntution. — Found on the same host at Beaufort, N. C. (Wil- 

 son). 



Color. — Body of the living copepod bright red owing to the large 

 quantity of blood diffused throughout the complex circulatory sys- 



FiGUKB 282. — Lernanthropus paenu- 

 latus: a. Female, dorsal; b, male, 

 dorsal 



