COPEPODS OF THE WOODS HOLE REGION 477 



third, and even the fourth pairs ; fifth pair always lacking. Ovisacs 

 short, eggs large. 



Male. — Head and first segment separated; remainder of thorax 

 fused with the genital segment into a spindle-shaped trunk, often 

 with suggestions of segmentation. Abdomen more or less distinct, 

 1-segmented; caudal rami much larger than in the female, armed 

 with spines. Antennae, mouth parts, and swimming legs as in the 

 female. A single species in this area. 



HATSCHEEIA HIPFOGLOSSI (Kr^yer) 



Figure 285, c, d 



Clavella hippoglossi Kr0yer, Naturh. Tidsskrift, vol. 1, p. 205, pi. 2, 1837. 

 EatscheMa hippoglossi T. and A. Scott, The British parasitic Copepoda, p. 112, 

 pi. 33, figs. 3, 4; pi. 34, figs. 8-11, 1913. 



Occurrence. — Forty specimens, including both sexes, were taken 

 from the gills of the halibut, caught off Nantucket Island, June, 1906. 



Distribution. — European seas (Kr0yer, Milne Edwards, Beneden) ; 

 British Isles (T. and A. Scott) ; Iceland, Greenland (Hansen). 



Color (preserved material). — Body a pinkish flesh color, oviducts 

 darker, the contents of the digestive system almost black; ovisacs 

 grayish white. 



Feifncde. — Body elongate, depressed; head wider than long; first 

 segment forming a neck between the head and trunk; remainder of 

 thorax fused with genital segment into a trunk five times as long as 

 wide, with rounded lobes at the posterior corners. Between these 

 lobes is the 1-segmented abdomen, about the same size as one of the 

 lobes and not distinctly separated from the trunk. First antenna 

 5-segmented, sparsely setose; second antenna stout, its apical claw 

 curved into a half circle. Second maxilla tipped with a stout claw 

 and a circular pad, both fringed with minute hairs; maxillipeds 

 elongated and slender, the apical claw nearly straight. Two pairs 

 of biramose legs, rami 2-segmented. Total length, 6-8 mm. Egg 

 strings, 10 mm. long. 



Male. — Head larger than in the female, wider than the trunk, 

 the frontal margin somewhat concave; first segment much narrower 

 than the head and very short; trunk about twice as long as wide, 

 with marginal indentations indicating segments. Abdomen wider 

 than long; caudal rami much longer than those of the female, 

 each apparently jointed near the center. Antennae, mouth parts, 

 and swimming legs as in the female. Total length, 1-1.5 mm. 



Retiiarks. — This is the largest species of the genus and has never 

 before been reported from our American shores. It is rather com- 

 mon, however, upon the halibut around the British Isles and in 

 the North Sea. 



71937—32 32 



