No. 2194. NORTH AMEltlCAN PARASITIC COPEPODS—WJ LSON. 85 



3. All three processes or horns developed; genital segment with a double 



sigmoid curve; egg cases coiled but slender 4 



4. Horns slender and cylindrical, all about the same length ; abdomen com- 



pletely fused with genital segment (40 mm.) 



hranchialis (Linnaeus), 17G7, p. 85. 



4. Horns flattened and laminate, posterior one three times the length of the 



lateral ones; abdomen not recurved; coils of the egg strings very large 



(14 mm.) lusci (Bassett-Smith), 1S9G. 



4. Horns very short, bilobed but not branched ; abdomen boot-shaped and 

 strongly narrowed where it joins the genital segment (32 mm.) 



godfroyi (Quidor), 1912. 



LERNAEOCERA BRANCHIALIS (Linnaeus). 



Plate 10, fig. 88 ; plate 12, figs. 98-107 ; plate 17. lig. 140. 



Lcrvaca lira7ichialis Linnaeus, Systenia Naturae. 17G7, vol. 1, pt. 2, p. 

 1092. — Glaus, Gesellschaft zur Beforderung der gesanunten Naturwissen- 

 schaften zu Marburg, vol. 9 supplement, 18GS, p. 16, pis. 3, 4.— IMetzgeb, 

 Archiv fur Naturgeschichte, vol, 34, 18G8, p. 106. — A. Scott, Liverpool 

 Marine Biology Committee Memoirs, No. G, 1901, p. 33. — T. and A. Scott, 

 British Parasitic Copepoda, Ray Society, London, 1913, p. 142, pis. 42, 43. 



Lcrnaca yudina Fabricius, Fauna Groenlandica, 1780, p. 33G. 



Lerncoccra branchialis Bi^mnville, Journ. de Physique, 1822, vol. 95, p. 

 376. 1 plate. 



Lcrnacoccra branchialis Nordmann, Mikrographische Beitriige, 1832, heft 2, 

 p. 130. 



Host and record of specimens. — This parasite is very coninion upon 

 various species of Gadidae, especially the common cod, as the follow- 

 ing list of specimens in the National Museum collection Avill show. 

 It is always found near the base of the gill arches with its head 

 buried in the underlying tissues close to the heart or the ventral 

 aorta. 



From the Greenland cod, Gadus ogac, 2 females, Cat. No. 6211, 

 from Disco Bay, Greenland. From the common cod, Gadus cal- 

 larias, 1 female. Cat. No. 6145, from Georges Banks; 1 female, Cat. 

 No. 8488, from Harpswell, Maine; 4 females. Cat. No. 12910, from 

 "Woods Hole, Massachusetts; 2 females, Cat. No. 12911, from Browns 

 Banks; 2 females. Cat. No. 12912, from Casco Bay, Maine; 1 female. 

 Cat. No. 14324, from Harpswell, Maine; 5 females. Cat. No. 42329, 

 from Casco Bay, Maine; 1 female. Cat. No. 47811, from Harpswell, 

 Maine ; 3 females. Cat. No. 47812, from Woods Hole, Massachusetts ; 

 3 females. Cat. No. 47813, from Woods Hole, Massachusetts; 2 fe- 

 males, Cat. No. 47814, from Harpswell, Maine; 3 females, Cat. No, 

 47815, no locality. 



Cat. No. 42300 contains 2 females with no host given ; it came from 

 the Omaha Exposition. 



External specific characters of female. — Cephalothorax globular 

 and provided with three branched horns, two lateral and one median 



