30 MR. E. J. MIEE3 ON THE IDOTEIDiE. 



There are also dried specimens from Genoa and Sicily (Old 

 Collection), three of unkuown locality collected during the voyage 

 of H.M.S. ' Herald,' and two from Egg Harbour, United States 

 (T. Say), designated I. irrorata ; one also from Pictou, Nova Scotia, 

 to which "White applied the name of /. oxyura. 



In the fine series preserved in spirit in the Paris collection 

 are the type specimens of the Idotea tricuspidata of Desmarest, 

 from La Eochelle, and of Milne-Edwards, from Oran. The former 

 well represents what may be considered the typical condition of 

 the species, in which the median lobe of the distal end of the 

 terminal segment is considerably more prominent than the 

 lateral ones, which yet are distinct, and the body is o£ somewhat 

 oblong-oval shape. 



In this collection there are specimens from Iceland (Cape Re- 

 search), Bohuslan (Malm), Dublin (Kinahan), the Channel, Bona 

 on the Algerian Coast (M, Lucas and M. Letourneux). From the 

 latter locality a large series of specimens show great variation in 

 the purplish markings of the body, but very little in the form of 

 the terminal segment, in which the median tooth of the posterior 

 margin is very short ; the same is true of the very numerous 

 series from the Channel. 



I have also had under my examination the types (all more or 

 less imperfect) of Idotea hrevicornis, M. -Edwards, from Australia 

 ("Bale de& chiens marins," M. Ereycinet), and cannot regard 

 them as specifically distinct from /. marina. The differences 

 mentioned by Milne-Edwards in his description cannot be con- 

 sidered of specific importance, in view of the great degree of 

 variability now ascertained to exist in European specimens of 

 this species. 



A male from the Eed Sea (M. Clot-Bey) is of large size, with 

 largely-developed posterior epimera, and terminal segment with 

 a prominent median tooth. Another from Java (Exp. de la ' Chev- 

 rette ') is in fragmentary condition, but probably belongs to this 

 species. Three specimens (male and two females) are in the 

 collection from Brazil, Desterro (Dr. E. Miiller), which closely 

 resemble, except for their pale colour, specimens from the Medi- 

 terranean and British Channel, and a male from New Zealand 

 (M. Petit) ; also a female from the Atlantic Ocean (M.A.Edwards) 

 designated /. brevicauda. 



In the Linnean Cabinet at the rooms of the Linnean Society 

 in Burlington House is a specimen which bears the name " mari* 



