614 PROCEEDll^QS OF THE NATIONAL MUSEUM. vol. 47. 



transparent area. Maxillipeds concealed between the second max- 

 illae, short and stout, with a curved terminal claw, having near its 

 base several small spines. 



Color (preserved material) a uniform grayish-yellow, the contents 

 of the digestive tube a shmuig black. 



Total length (without egg strings), 4 mm. Length of second 

 maxillae, 1.6 mm.; of trunk, 2.8 mm,; of bulla, 1.5 mm. Thickness 

 of trunk, 1.75 mm. 



(thymaUi, the generic name of the most common host.) 



Male. — Unknown. 



Remarlcs. — This species was first described by Kessler in 1868. 

 Olsson in 1872, not knowing of Kessler's description, called it Lernae- 

 opoda clavigera. Gadd in 1904, recognizing the identity of the two 

 species, adopted Kessler's name and made Olsson's a synonym. It 

 may be readUy distinguished from aU other species by its enormous 

 club-shaped bulla. The three females taken from Salmo alpinus 

 were labelled by the University of Stockhohii ' ^ Lernaeopoda alpina," 

 but they show none of the characters of that species whUe they do 

 conform m every particular to the present species. The short and 

 very plump body and the contour of the dorsal surface of the head 

 are also distinguishing characters. 



SALMINCOLA INERMIS (Wilson). 

 Plate 32, figs. 47 to 51. 

 Lernaeopoda inermis Wilson, 1911, p. 632, pi. 68, figs. 33-36. 



Host and record of specimens. — Found abundantly on the Lake 

 herrmg, Argyrosomus artedi, in Lake Huron and Lake Superior. 



The United States National Museum contains five lots of speci- 

 mens: a single type female, Cat. No. 42283, U.S.N.M., from Knife 

 Kiver, Duluth, Mmnesota; a paratypc female, Cat. No. 42284, 

 U.S.N.M., from Blind River, Lake Huron; a paratypc female. Cat. 

 No. 42285, U.S.N.M., from Marquette, Lake Superior; 140 females, 

 Cat. No. 42278, U.S.N.M., from Saginaw Bay, Lake Huron; a single 

 female, Cat. No. 6113, U S.N.M., from the gills of the humpback 

 whitefish, Coregonus nelsonii, taken in the Yukon River, Alaska, 

 byE. W.Nelson. 



Remarlcs. — When this species was first described in 1911 it was 

 placed with its nearest relatives in the genus Lernaeopoda. 



Now that these relatives are to constitute a separate genus this 

 species must be kept with them. It has already been fully described 

 and figured, but attention may be called to one or two characters 

 which appear in the large lot from Lake Huron, obtamed after the 

 previous description had been published. 



The second maxillae are usually turned back against the ventral 

 surface of the trunk, brmging the buUa close to the posterior end of 



