\ 



HoMOLA. This genus, which is represented in India by three good species, 

 was long regarded as characteristic of the Mediterranean. The Mediterranean 

 species {H. harhata) is now known to occur in the West Indies and neighbouring 

 coasts of N. America, and a form that is probably only a variety of it — described 

 in the sequel as H. andavianica — has lately been taken in the Martaban end of 

 the Andaman Sea at 79 — 90 fms. This H. andamanica may possibly be the 

 same as Henderson's H. orientalis from the Banda and Sulu Seas. 



Furthermore, of the 3 Indian species of HomoJa, one — described in the 

 sequel as H. profmidorum — is closely related to the Mediterranean H. Cuvieri in 

 Wood-Mason's genus (preferably subgenus) Paromola. 



Dyngmene ranges across the whole Indo-Pacific from Mauritius to California. 



Calappa is a shallow-water genus : the species are distributed all over the 

 Indo-Pacific, from Africa to California, and are also represented in the West 

 Indies, the Mediterranean, and on the west coast of Africa as far as the Cape. 



MuRSiA. The geographical distribution is not remarkably different from that 

 of Calajjpa, except that it does not occur in the Mediterranean. 



Rakdallia seems to be confined to the Indo-Pacific. 



Ethusa, of which Ethusina is a subgenus, extends from the West Indies 

 and neighbouring coasts of N. America to the Azores and the Mediterranean. 

 In the Indo-Pacific it extends from the Arabian Sea to Japan and the Philip- 

 pines, to Fiji, and to California and the Pacific coast of Panama. 



Lyeeidus. One species is common in Indian waters at 200-400 fathoms : 

 another belongs to the North American Atlantic slopes at 100 fathoms : a third 

 species belongs to the Japanese fauna, and also extends into Australasian waters. 



Eohinoplax, Cyrtomaia and Platymaia appear to be confined to the Indo- 

 Pacific. But I do not think that Cj/rfomaia is really different from Echiuoplax, 

 or that either should be separated from the Atlantic and Mediterranean Ergasticus 

 of A. Milne-Edwards. 



Sphenocaecinus, one species of which occurs in the Andaman Sea at 

 161-250 fathoms, is a genus originally discovered in the Caribbean Sea at 100 

 fathoms. A third species, however, has been described by Miss Rathbun from 

 shallower water in the Gulf of California. Oxypleurodon hardly differs fi-om 

 SphenocMrcimis. 



ScYEAMATHiA is a North-Atlantic genus (European, N. American and Carib- 

 bean) that is well represented in Indian Seas. Other species are known from 

 the Philippines and from the Galapagos. 



Maia. In the time of H. Milne Edwards this was supposed to be a genus 

 peculiar to the seas of Europe (Mediterranean, British Seas, North Sea). One 



