NO. 1573. PARASITIC COPEPODS— WILSON. 381 



plates of the sixth segment. Anal laminae large and elliptical, 

 articulated by their outer corners only to the outer corners of the 

 abdomen; each armed with three terminal spines, and one on the 

 outer margin. Egg-strings narrow and about twice the length of 

 the body. 



First antennae of medium size, their basal joints entirely concealed 

 beneath the frontal plates; second pair enlarged with a short, sickle- 

 sliAped terminal claw. Mouth-tul)e as long as in ferox and a little 

 ^vider; maxilla^ large and three-jointed, the basal joint nuich the 

 largest and carrying on its outer margin two small processes, in con- 

 tact with each other, and each tipped with a small spine. These 

 are evidently the rudiments of the exopod; the endopod is made up 

 of two cylindrical joints, the terminal one considerably the smaller. 



First maxillipeds similar to those in ferox: second pair with the 

 basal joint more swollen and armed with larger corrugated knobs; 

 the terminal claw rather slender but of the usual pattern. Swimming 

 legs similar to those in ferox, the basal joint of the first exopod not 

 enlarged as much and more pointed. 



The spines and seta? are arranged as follows: First exopod, 1,0; 

 3,111: endopod, 0,0; 0,111: second exopod, 1, 0; 1,0; 2,V: endopod, 

 0,1; 0, 1;0,AT: tliird exopod, 1,1; 1,1; 3, VI: endopod, 0,0; 0,11; 

 0, VI. Fourth rami each with four rudimentary spines near their tips. 



Total length, 17 mm.; length of carapace on mid-line, 5 mm.; 

 width of same, 7 mm. ; length of second and third thorax segments, 

 1 mm. ; of genital segment, 8 mm. ; of dorsal process of sixth segment, 

 3.5 mm.; of egg-strings, 40 mm.; width of genital segment, 4 mm. 

 Color of preserved material a light brown without pigment spots. 



(producta, elongated, drawn out.) 



The present is the species described by Mliller in 1785 as Callgus 

 produdus, and afterwards taken by Latreille as the type of the new 

 genus Dinemoura wliich he established in 1829. 



Neither Midler's nor Latreille' s description was very satisfactory, 

 but fortunately the specimens upon wliich these descriptions were 

 founded were preserved in the museum in Copenhagen, and Steen- 

 strup and Ltitken were enabled to recognize Midler's species and to 

 correct some of the errors in regard to it and to its hosts. Accord- 

 ingly they have given us a history of this species up to 1861, wliich 

 clears up many of the difficult puzzles and mistakes in identity and 

 nomenclature. They declare in substance that the present species 

 was described and figured first by Herbst in an article entitled 

 " Beschreibung eiiier sehr sonderbaren Seelaus vom Hemorfische," 

 published in Schriften der Berlinischen Gesellschaft naturforschenden 

 Freunde for 1780, pp. 56 to 67. Herbst obtained his specimens from 

 Pastor Chemnitz, of Copenhagen, who in turn had them from the 

 Faroe Islands with the information that they had been fastened to 



