ABT. 5. NORTH AMERICAN PARASITIC COPEPODS WILSON". 71 



of the same diameter throughout, and are bluntly pointed. The 

 color of the appendages and body margins is that of transparent 

 cartilage; the center of the body is opaque and dark gray. The 

 nauplius eye is not visible in any of the specimens examined. 



Remarks. — This species is very abundant on the gills of the sand 

 shark, where they appear as minute dark brown or black lines against 

 the red filaments. They are firmly fastened by their maxillipeds, 

 which are clasped around the filaments, with the terminal chelae 

 buried in the tissue of the filament. "When removed they always 

 retain some of the tissue still clasped in the chelae, together with an 

 abundance of slime, and must be thoroughly cleaned before they can 

 be properly preserved. When placed in water they wriggle about 

 like a worm, but can not move definitely in any direction. They get 

 hold of any fragments of tissue or waste material that may be 

 within reach and cling to them as tenaciously as to the gill filaments, 

 but if thej^ are well cleaned when removed and are kept free from 

 such waste material they will live three or four days. No males 

 could be found, although the gills of manj^ fish were searched dili- 

 gently for them. 



Genus LAMPROGLENA Nordmann. 



Lainprog'lena Nordmann, Mikrographische Beitriige, 1832, pt. 2, p. 1. 

 Lamproglena Milne Edwakds, Histoire Naturelle des Crustaces, 1840, vol. 3, 



p. 487. 

 Lamproglena Claus, Zeit. fiir wiss. Zool., vol. 25, 1875, p. 352. 

 Lamproglena Brian, Copepodi parassiti del Pesci d'ltalia, 1906, p. 78. 



Generic characters of female. — Head partially separated from the 

 first thorax segment and divided by deep lateral sinuses into an 

 anterior and posterior portion. First segment only half the width 

 of the head and very short, forming a neck; second, third, and 

 fourth segments increasing in size, the latter as large as the head; 

 fifth segment smaller than the first; genital segment nearly spherical 

 nnd much wider than the fiflh segment. Abdomen made up of three 

 segments, diminishing considerably in length and slightly in width 

 from in front backwards, the three together nearly as long as the rest 

 of the body. 



First antennae indistinctly jointed, heavily armed with setae; 

 second pair slender, four-jointed, strongly curved, setose and not 

 imcinate. Mandibles awl-shaped, with a double curve. Second 

 maxillae powerful prehensile organs, armed with stout claws. Max- 

 illipeds also prehensile but weaker, with multiple terminal claws. 

 First four pairs of legs biramose, the rami indistinctly two-jointed; 

 fifth legs uniramose, one-jointed, and very small. Male unknown. 



Type of the genus. — Lamproglena pulchella Nordmann, first 

 species. 



