10 ARKIV FÖR ZOOLOGI. BAND 14. N:0 10. 



in a large conical tooth and has along the posterior margin 

 a row of similar teeth, diminishing in size toward the base. 

 The maxiUiped has a large basal joint, a mnch smaller se- 

 cond joint, with a knob armed with spines on its inner 

 distal corner, and a small curved terminal claw, with a small 

 spine on its inner margin near the tip. The first and second 

 swimming legs are quite small, each one-jointed, bifurcate, 

 with the rami bluntly rounded. The egg strings are cylind- 

 rical, as long as the entire body, and very wide. They are 

 not straight as in other species, but are curved in and out 

 twice near the base, giving them a peculiar, distorted appea- 

 rance sufficient to distinguish the species. 



Color (preserved material) a uniform snow-white. 



Total length, including soft processes, 6 mm. Head l.eo 

 mm. long, I.25 mm. wide. Thorax 2 mm. wide. Egg strings 

 6 mm. long, 1 — 1.25 mm. wide. 



Specific characters of male. First and second thorax 

 segments fused with the head, the resultant cephalothorax 

 evenly curved dorsally and projecting a little ventrally. 

 Third segment free but poorly differentiated, the remaining 

 segments fused with the genital segment into an ellipsoidal 

 posterior body, terminated by two conical anal laminae, 

 which are destitute of setae. Appendages like those of the 

 female with the usual sexual variations; maxillae without 

 teeth on the posterior margin, but with a palp. Swimming 

 legs apparently lacking. 



Total length O.eo mm. Cephalothorax O.35 mm. long, 

 0.30 mm. thick. 



{distorhis, distorted, alluding to the egg strings). 



Remarks. This species at first sight seems something 

 like the type of the genus, C. zei, but differs from it in 

 many particulars. It is only half the size, has a much 

 smaller number of soft processes, only a single pair of which 

 are bifurcate, and the egg strings are radically different in 

 size and shape. Consequently, although it is a parasite of 

 the same genus of fisli, it must be credited as a new species. 



The peculiar distortion of the egg strings is totally un- 

 like that of any other parasitic copepod, and serves of itself 

 to distinguish the species. 



