566 



BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



BOPYRINA THORII Richardson. 

 Bopyrina thorii RICHARDSON, Proc. U. S. Nat. Mus., XXVII, 1904, p. 74. 



Locality. Key West, Florida, on Tkor floridanns Kingsley. 

 Body of adult female asymmetrical, turned very much to one side. 

 Color yellow, with a few markings of black on one side of the thorax 

 and in the center of the first three segments of the abdomen. 



Head large, with frontal margin produced in a rounded lobe, which 

 is turned upward in the specimen; the antero-lateral angles are pro- 

 duced into small processes. The eyes are black and distinct. 



The segments of the thorax are all distinctly separated from each 

 other. The epimera are distinct on the longer side of the body as 



long, narrow plates on the anterior 

 portion of the lateral margin of 

 the first four segments. Ovarian 

 bosses are not present on any of the 

 segments. 



The abdomen is composed of six 

 segments, completely fused in the 

 middle, but indicated on both lat- 

 eral margins. The terminal seg- 

 ment is rounded posteriorly. 



There are four pairs of single- 

 branched pleopoda. The marsu- 

 pium is a large, open area, nor- 

 mally tilled with eggs, and inclosed by five pairs of lamella?. The first 

 lamellae have the distal lobe rounded. The fifth lamellae are narrow, 

 elongated plates. 

 Male unknown. 



Only one specimen was obtained by the U. S. Bureau of Fisheries 

 steamer Albatross at Key West, Florida. The species is parasitic on 

 Thor floridanus Kingsley. 



This species differs from the preceding species chiefly in the form 

 of the distal segment of the first lamellae of the marsupium. 

 Type. Cat. No. 29099, U.S.N.M. 



97. Genus BOPYROIDES Stimpson. 



Body of female broad, flattened, somewhat asymmetrical. 



Abdomen distinctly segmented; lateral parts of segments or pleural 

 lamellae not developed. 



Palp of maxillipeds well defined. 



Incubatory plates widely separated, not concealing the entire incu- 

 batory cavity and not fully covering the eggs; distal segment of first 

 pair not produced posteriori} 7 in a lobe. 



See Sara for characters of genus, Crust, of Norway, II, 1899, p. 198. 



FIG. 627. BOPYRINA THORII. a, DORSAL VIEW or 

 FEMALE, b, VENTRAL VIEW OF SAME, x 15. 



