No. 2194. NORTH AMERICAN PARASITIC COPEPODS— WILSON. 93 



These can no longer be regarded as rudiments of the antennae 

 and mouth parts for several reasons: 



1. The true antennae have been found in their proper position 

 on the dorsal surface of the head. In creatures as thoroughly 

 chitinized as this genus of parasites the minute appendages break 

 off with especial ease, and the present author has never before seen 

 specimens to which they remained attached. And when once broken 

 off it is practically impossible to find any scars showing their 

 former presence. 



2. On comparing different specimens of sultanus the form and 

 size of these knobs is found to vary far more than would be prob- 

 able if they were the rudiments of appendages. 



3. The interior of the knobs is in connection with the cavity of 

 the head, which is manifestly unlike the condition of appendages. 



They must be regarded, therefore, as mere processes, correspond- 

 ing to the frontal processes in other genera, but in this genus re- 

 stricted in number and confined to the ventral surface. In this 

 genus then, as in Pennella^ the maxillae have apparently disap- 

 peared. 



The distinctive characters in the morphology of the species are 

 the chitinization of the entire body so that its form remains tlie 

 same however poorly it may be preserved, the two rows of branched 

 processes on the sides of the abdomen and genital segment, the 

 pushing of the ovaries and oviducts forward into the base of the 

 neck, and the convolution of the ducts of the cement gland. 



Genus HAEMOBAPHES Steenstrup and Liitken. 



Haemobaphcs Steenstrup and Luticen, Konselise Dauske Videnskabernes 

 Selskabs Skrifter, 5te Raekke, 1861, p. 405. 



External generic characters of female. — Cephalothorax subspheri- 

 cal, much inflated and soft, with a tripartite eye buried in the tissues 

 over the base of the esophagus; produced laterally into a cushionlike 

 process on either side, with a short, rounded point extending diago- 

 nally forward and outward; anterior margin with a rounded knob on 

 either side of the midline. 



Second, third, and fourth thorax segments distinctly separated, the 

 first two nearly as wide as the cephalothorax and sometimes pro- 

 duced laterally into cushionlike processes, the fourth segment nar- 

 rower with short, bilobed processes on the venterolateral surface like 

 those in C hondr acanthus ; similar processes sometimes found on the 

 third segment. 



Neck long, slender, cylindrical, and flexed upon itself a little in 

 front of the center, where it is completely chitinized and armed with 

 numerous short chitin horns, simple or branched. 



