354 A HISTORY OF RECENT CRUSTACEA 



large and curved third pair of claws, and, while with its 

 ventral surface it covers the top of the tongue, it projects 

 beyond the apex of it with its first pair of feet, so that 

 the mouth of the fish can hardly be closed. The male, as 

 usual, many times smaller than the female, is often found 

 covered by her tail and ventral surface.' Though this 

 species appears to be confined to the Atlantic, Glossobius 

 latkauda (Milne-Edwards) pays the same amiable atten- 

 tions to the flying-fishes of the Pacific, and Glossobius 

 aurihis, Bovallius (see Ceratothoa auritus, Plate XV.), is 

 reported both from the Atlantic and the ' Indian Seas.' 



Ceratothoa, Dana, 1852, includes twelve species, in 

 some of which the male is very much smaller than the 

 female. Ceratothoa Banksii (Leach) is identified with the 

 Pediculus marinus of Seba. Miers finds that it is also the 

 same as the Oniscus imhricatus, Pabricius, the type of 

 which is in the British Museum from the collection of Sir 

 Joseph Banks. The name Banlcsii is therefore superseded 

 by imhricatus. Hansen notes as a singular circumstance 

 that in the second stage of the young of this species the 

 fifth pleopods carry hooks, which are absent from that 

 pair in the adults of this whole group. Ceratothoa crassa, 

 Dana, is, according to Dr. Bovallius, a Glossobius. It is 

 worth remarking that, though the genus Ceratothoa is 

 accepted as Dana's, he is not cited as an authority for a 

 single one of the accepted species. On the other hand, his 

 Ceratothoa linearis is transferred to Glossobius, and his 

 Ceratothoa crassa by Schiodte and Meinert is called Glos- 

 sobius laticauda (Milne-Edwards), and by Bovallius Glos- 

 sobius crassus (Dana). It would appear, therefore, that 

 Glossohkis is really a synonym of Ceratothoa, and that a 

 new generic name is required for the species that have 

 been assigned to Ceratothoa. For this purpose Meinertia 

 may be fitly proposed. 



Cymothoa, Pabricius, 1793, still has seventeen species, 

 after the successive restrictions to which it has been sub- 

 jected. Of Cymothoa eremlta (Briinnich) the Copenhagen 

 Museum has specimens still adhering to the tongues of the 

 fishe.'! on which they were originally taken, showing that 



