ART. 5. NORTH AMERICAN PARASITIC COPEPODS — WILSON, 47 



ignated as trigonocephahis by Heller in 1865 are identical. If this 

 be true, then Kr0yer's name takes precedence and must be retained, 

 while Heller's becomes a synonym. But the identity of the two 

 species does not seem possible, owing to the following differences: 



1. The lateral margins of the head are smoothly convex in trigo- 

 nocephalus, while they are sinuate with deep invaginations in scribae. 



2. The wings on the free thorax project forward at the anterior 

 corners and backward at the posterior corners in scribae and are 

 simply rounded, without projecting, in triganocephalus. 



3. The posterior portion of the dorsal plate is strongly narrowed 

 anteriorly and posteriorly in trlgonocepTialas^ while it is nearly the 

 same width throughout in scribae. 



4. The genital segment, abdomen, and anal laminae are without 

 transverse grooves in trlgonocephalits ; such grooves are present in 

 scribae and give the genital segment the appearance of being made 

 up of three joints, while each anal lamina appears also three- jointed. 



5. The fourth legs in trigonocephalus are divided less than half 

 their length, the rami are narrow, acuminate and equal, while they 

 project laterally half their length beyond the dorsal plate. In 

 scHbae the legs are divided almost to their base, the endopod is con- 

 siderably longer and wider than the exopod and both are bluntly 

 rounded, while they do not reach the margin of the dorsal plate but 

 are wholly covered in dorsal view. 



Such marked differences seem to preclude the idea of the identity 

 of the two species, and accordingly they have been kept separate. 



LBRNANTHROPUS NORDMANNI, new name. 



LernantJiropus kr0yeri Noedmann, Bull. Soc. Imp. Moscou, vol. 37, 1S64, 

 p. 508; pi. 7, figs. 5-8. 



Remarks. — P. J. van Beneden described and figured ^^ a new 

 species of Lemanthropus, to which he gave the name kr0yeri. The 

 species was afterward noted by Claus, who added a description and 

 figures of the male. It has been subsequently mentioned by nearl}?^ 

 every investigator who has worked in the Mediterranean, and finally 

 both sexes were again described and figured by A. Scott,^* thjs time 

 from British seas. Meanwhile Nordmann, in the reference given 

 above, described and figured three female specimens, which he iden- 

 tified as belonging to this species and which were taken from the 

 gills of a large Labrax lupus on the coast of Normandy. A com- 

 parison of Nordmann's description and figures with those of Bene- 

 den and Scott shows that the species are not the same. The differ- 

 ences which separate them are the following : 



23 Ann. des Sci. Nat., ser. 3, vol. 16, 1851, p. 102, pi. 3, figs. 7-9. 

 " Trans. Biol. Soc. Liverpool, vol. 21. 1907, p. 95, pi. 3, figs. 1-13. 



