382 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxiii. 



the tail of a "Hemorfische," which was in all probability Lamna 

 cornuhica. 



The Zoological Museum of the university at Copenhagen possesses 

 several specimens of this species from the Faroe Islands which were taken 

 from Lamna cornuhica. The Physiological Museum of the same univer- 

 sity possesses another particularly fine lot of females of D. producta 

 fastened tightly to a piece of shark's skin. This piece of skin looks 

 as if it came from Scymnus glacialis, and it has been so recorded by 

 one or two investigators, but the scales on it show that it really 

 belonged to a Lamna cornuhica. Such a shark was captured and 

 kept on exhibition for some time, and then purchased by the Univer- 

 sity Museum. It bore numerous marks of fish lice and the specimens 

 fastened to it while on exhibition were all D. producta. 



Mliller was the next to describe the species in 1785; lie does not 

 state whence he obtained liis specimens, but Steenstrup and Liitken 

 think it probable that they came from the same Faroe Island col- 

 lection. Mliller' s figures and description are less satisfactory than 

 Herbst's, and he makes the serious blunder of including Fabricius's 

 Binoculus salmoneus, which belongs to the genus Lepeophtheirus , 

 with liis " Caligus productus." 



In 1829 Latreille, recognizing that this was not a Caligus, made 

 of it a new genus which he called Dinemoura. He was content, 

 however, to accept the descriptions already given and added almost 

 nothing in the way of further information. Consequently his contri- 

 bution consisted of little more than a change of name. 



In 1835 Johnston described a British species wliich he called Pan- 

 darus lamnx, and wliich was taken from a Beaumaris shark, Lamna 

 monensis. Baird incorporated this in his Natural History of the 

 British Entomostraca in 1850 under the name of Dinemoura lamnse. 

 He recognized that it was the same that Herbst had described, but 

 singularly enough did not identify it with Miiller's Caligus productus; 

 the name he gave it therefore becomes another synonym of that 

 given by Latreille. 



P. J. Van Beneden in 1857 described and figured this species under 

 the name Dinemoura elongata, still another synonym. 



It might have been difficult to decide whether Beneden really had 

 a new species or not, but Steenstrup and Liitken found that his speci- 

 mens came from Copenhagen and that they were taken from the 

 same piece of shark's skin already mentioned. 



Their host, therefore, was Lamna cornuhica and not Scymnus gla- 

 cialis, as Beneden states, and the species is identical with those 

 described before. Thirty-five years later, in 1892, Beneden pre- 

 sented what he claimed was the male of his D. elongata, still retain- 

 ing his former name for it, although he acknowledges in so many 



