no. uoi. PARASITIC COPEPODS—CALIGIBM— WILSON. 649 



Total length 2.8 mm. Length of carapace 1.53 mm. ; width of same 

 1.6 mm.; length of genital segment 1 mm. Egg strings wanting. 



Color not given. 



{heckelii, to Prof. Ernst Heckel.) 



This species was founded by Kroyer upon three specimens,, all 

 females, two of which he obtained from the Vienna Museum while 

 the third came from Biloxi, near New Orleans, on the shore of the Gulf 

 of Mexico. The two Vienna specimens were said to. have been found 

 by Heckel on the gills of an Ephippus glgas from the Brazilian coast. 

 They had been labeled by Kollar Caligus lieckelii and Kroyer retained 

 the specific name of the label but changed the genus. The North 

 American specimen was found on the gills of the same fish (the angel - 

 fish or spadefish, Clisatodlpterus faber, Broussonet). 



This is the onl} r representative of the genus found in North Ameri- 

 can waters and may be recognized by the entire absence of the 

 abdomen. 



NONAMERICAN SPECIES. 



The collection of the National Museum includes specimens of the 

 following species, which have not thus far been found in North Amer- 

 ican waters. Three of the species are new to science and one of them 

 is made the type of a new genus. 



CALIGUS TERES, new species. 

 Plate XXVI. 



Female. — Carapace one-fourth longer than the rest of the bod} T , 

 about the same length and width, and very strongly ovate in shape, 

 the posterior portion being more than twice as wide as the frontal 

 plates. The latter are well differentiated, with large, almost circular 

 hi n i ilcs which project strongly in front of the antenna?. The posterior 

 sinuses arc wide and comparatively deep, leaving a median lobe about 

 half the entire width and projecting considerably behind the lateral 

 lobes. The sinuses are slightly inclined away from the mid line, and 

 the posterior margin of the median lobe is a little concave. 



The lateral lobes are broad and well rounded, their thoracic portion 

 being very prominent and projecting considerably behind the rest of 

 (he lobes. Thoracic area large and well rounded, embracing half the 

 length and fully two-thirds the widtli of the carapace. The crossbar 

 ami the lower portion of the sides of the "H" make a nearh r perfect 

 semicircle. 



The free thorax segment is almost half as long as the genital seg- 

 ment, and is strongly narrowed in front, of the bases of the fourth legs, 

 lea\ ing t he sides concave. 



The genital segment has a broad, barrel shape, with evenly rounded 

 •-ides; it is two-fifths the length of the carapace, as wide as it is long, 



