NO. 2063. NORTH AMERICAN PARASITIC COPEPODS— WILSON. 709 



mouth parts. The manuscript notes and sketches of Dr. M. T. 

 Thompson have been of great service in making out the foregoing 

 description. 



BRACmELLA MITRATA, new species. 

 Plate 54, fig. 225, plate 55, figs. 2.35 to 238. 



Host and record of specimens. — Four adult females with egg strings 

 were obtained by Dr. M. T. Thompson from the gills of the tilefish, 

 Loijholatilus chameleonticeps, off Woods Hole, Massachusetts. Three 

 of them are numbered 39594, U.S.N.M., and become paratypes; the 

 fourth is made the type of the new species with the number 43559, 

 U.S.N.M. A single rather poor specimen was obtained from the 

 same host and locality by the present author, and has been numbered 

 39589, U.S.N.M. 



Specific characters of female. — Cephalothorax short and very thick- 

 set, and curved so that the axis of the head is at right angles to the 

 Crunk; a small dorsal carapace; groove separating the cephalo- 

 thorax from the trunk obscure; trunk flattened dorso-ventrally, a 

 little longer than wide, narrowed anteriorly and obliquely truncated 

 (mitered) posteriorly; genital process on the ventral surface with a 

 laminate posterior process on either side of it; egg strings cylindrical 

 and as long as the entire parasite; eggs arranged in 6 longitudinal 

 rows, about 25 in a row. 



First antennae three- join ted, the basal joint much stouter than the 

 others, the terminal joint tipped with three stout setae. 



Second antennae turned down squarely across the frontal margin, 

 the exopod (ventral) much smaller than the endopod, two-jointed and 

 tipped with two short spines, the endopod rounded and unarmed. 

 First maxillae slender and tipped with two long spines and a shorter 

 one on the outer margin; palp short and stout and tipped with two 

 spines. Second maxillae short, about the same diameter throughout, 

 and separate to the very end, where they are joined to a short- 

 stemmed, button-shaped bulla. Maxillipeds with a stout basal joint 

 and a slender terminal claw, carrying an accessory spine on its inner 

 margin near the tip. 



Color (preserved material) , a uniform brownish-yellow. 



Total length, excluding egg strings, 6 mm. Cephalothorax 2.35 

 mm. long, 1.15 mm. wide. Second maxillae, 1.15 mm. long. Egg 

 strings, 5 mm. long. 



(mitratus, mitred or cut off diagonally, alluding to the posterior 

 margin of the trunk.) 



Male. — Unloiown. 



RemarJcs. — This species may be readily distinguished by the short 

 and very thick neck, by the laminate posterior processes, and by the 

 oblique truncation of the posterior part of the trunk. Here, again, 

 the notes and sketches of Doctor Thompson have been of great value 

 to the present author. 



