PARASITIC COPEPODS OF THE ZOOL. MUSEUM, KRA. 107 



Lepeophtheirus hippoglossi (Krøyer). 

 A single female was taken from an unknown host at New- 

 foundland, but it is practically certain that the host was a halibut 

 smce the species is confined to that fish or nearly so. 



Achtheinus dentatus Wilson. 



A single female lacking the second antennae, which were 

 probably left in the flesh of the host, was taken from the gill 

 €avity of Raja hinoculata at San Francisco, California. 



A second lot consisting of fifteen females and five males 

 was taken from the gill cavity of a species of Mustelus at San 

 Diego, California. 



A third lot contains three females and was taken from the 

 same host and locality as the one last mentioned. 



This species was first obtained from the skin and fins of 

 the soup-fin shark, Galeus Zyopterus, off the coast of Peru, and 

 included only females. Stebbing in the Annals of the South 

 African Museum, vol. 17, part 1, 1918, p. 40 described and figured 

 both sexes from the tail of a shark captured at Algoa Bay, 

 South Africa. While he adopted the name given by the present 

 author, he also suggested in the text that Dana might have 

 overlooked details in his genus Lepidopus (Pholidopus), or might 

 have made mistakes in his descriptions, and that thus his genus 

 may have been identical with Achtheinus. For example Steb- 

 bing suggested that while Dana recorded the first legs as unira- 

 mose one of the ranii might have been lost during dissection. 

 Such an accident is of course possible, but even then a drawing 

 of the basal joint and the remaining ramus would be markedly 

 different from the one Dana made. His figure showed a typical 

 uniramose leg, the second joint attached to the lateral margin 

 of the basal joint, and the whole leg standing out at right angles 

 to the body axis. And there is no place for the attachment of 

 a second ramus, because the one figured occupies the whole 



