ME. E. J. MIERS ON THE ID0TEIDJ3. 53 



iu tbe Museum collection exceeds 2^ inclies (58 inillim.), but 

 average-sized examples measure about l|inch (45millim.). 



This species appears to be widely distributed throughout the 

 Antarctic or, rather, Austral circumpolar region. It occurs also 

 in the Indian Ocean (Pallas), Southern Australia, and on the 

 Eastern coasts of S. America northward to Eio de Janeiro, and 

 on the "Western coasts as far north as Talcahuano (Chili). 



The above description is drawn up from specimens, formerly 

 designated I. affinis, in the British Museum. 



There are examples of both sexes, and preserved dry, in the 

 collection without definite locality, designated by Leach I. elevata : 

 others from Australia (Earl of Derby) ; some young examples 

 from S. Australia (purchased), a specimen from Tasmania, a male 

 and female from Elinders Island (Surg. Eayner, H.M.S. ' Herald ') ; 

 two males and a female from the Auckland Islands (Admiralty), 

 designated by White I. longicornis ; a male of large size and two 

 females from JN'ew Zealand (purchased) ; two smaller examples 

 from Collingwood, Nelson County, New Zealand (H. Drew) ; a 

 male of large size, said to come from the Cape of Grood Hope. 

 All of the above preserved dry. Also two males, preserved in 

 spirit, from the Ealkland Islands (Admiralty). 



In the Paris collection I have examined the types of I. Lalandii 

 from the Cape of Grood Hope (M. de Lalande), which are of very 

 large size (2^ inches, 59 millim.), having the epimera as described 

 above, and the postero-lateral angles of the fourth to seventh 

 thoracic segments slightly produced and acute. Also the tyjjes 

 of I. affinis, M. -Edwards, from Eio de Janeiro (M. Ereycinet), in 

 which the antennae are now imperfect. These specimens are of 

 rather small size ; but the differences between them and I. Lalandii 

 are not greater than I have observed between examples from one 

 and the same locality of this species, and I have only marked the 

 citation with doubt on account of the wide-removed habitat. 

 There is, however, a specimen of larger size from South America 

 (M. A. Edwards). Specimens are in the collection, also, from 

 Talcahuano, Chili (M. Jacquinot), one from Auckland, several 

 from New Zealand (Exp. de la Zelee, Quoy and Graimard, M. 

 Lavoux), and others without locality. 



In the large series that has been under my observation I have 

 noticed considerable variation in the leugtli of the flagella of the 

 antennae, the robustness of the legs, and the depth of the posterior 

 notch of the terminal segment and the acuteuess of its postero- 



