NO. 2063. NORTH AMERICAN PARASITIC COPEPODS— WILSON. 655 



sequence of the structure of the second maxillae. A more careful 

 study of both sexes and especially of the male, in the light of the 

 differentiations here established, shows that the species belongs to 

 the genus Charopinus and not to Brachiella, and it is here transferred, 

 with the necessary change in the adjective (see pi. 26, fig. I). 



This and the two following species are the only ones thus far found 

 in North American waters. 



CHAROPINUS DALMANNI (Retzius). 

 Lernaea dalmanni Retzius, 1829, p. 109, pi. 6. 



Lemaeopoda dalmanni Kr0yer, 1837, p. 264, pi. 2, fig. 11; pi. 3, figs. 4a aud 46. 

 Charopinus dalmanni Kr0yer, 1863, p. 280, pi. 14, fig. 6, a to g.—T. Scott 1900 p 

 169, pi. 8, figs. 6 to 10. ' . • 



Host and record of specimens. — Two females with egg strings were 

 obtained from the nostrils of a skate at Polperro in 1884, and were 

 sent to the United States National Museum by Rev. A. M. Norman, 

 of England. They were nmnbered 12909, U.S.N.M. Another lot of 

 three females mth egg strings was obtamed from the nostrils of the 

 barndoor skate. Raja levis, at South HarpsweU, Maine, July, 1913, 

 by the author. These have received Cat. No. 43575, U.S.N.M. 



Remarls.—T\\Q description and figures published by Retzius, 

 although in many respects imperfect, leave no doubt as to the identity 

 of the parasite. And when supplemented by the excellent work of 

 Kr0yer and T. Scott there is practically nothmg to be added except 

 a few comments upon the morphology, and one or two corrections. 

 Turner and Wilson published, in 1862, an extended account of the 

 present species, includmg observations on its larval form. Their 

 figures are admirable, but whatever value their description may 

 possess is greatly dimmished by the fact that they mistook the ventral 

 for the dorsal surface, and have not named correctly a single appen- 

 dage except the second antennae, whose nomenclature they borrowed 

 from Kr0yer. The "eyelike" spots noted by Retzius and Ivr0yer 

 on either side of the thorax in front of the base of the second maxillae 

 are doubtless the maxillary glands, which often appear in other genera 

 of this family in the form of protuberances upon the external surface 

 of the cephalothorax. During the migration forward of the maxil- 

 lipeds and the migration backward of the second maxillae, these 

 glands are sometimes draAvTi out of the maxillae into the body of the 

 cephalothorax. Turner and Wilson describe what is evidently the 

 body of the gland and the excretory duct leading from it. The pos- 

 terior appendages are said by every investigator who has described 

 the species to spring from the ventral surface of the body in front of 

 the egg strings. But they are just as certainly dorsal as in ramosus 

 and the other species of the genus. If the cephalothorax be straight- 

 ened up into line with the rest of the body, the mouth parts are of 

 course on the ventral sm^f ace, and the posterior appendages are just 



