THE BRANCHIAE OF BATHYNOMUS 345 



garded individually, resemble little trees or plumes, arising 

 from stems, which, by repeated subdivision, produce a 

 regular bush of hair.' These branchial trees are connected 

 by their tubular stem with a network in the ordinary 

 laminae of the pleopods, and when the blood has been 

 aerated it is gathered into a marginal vessel, from which it 

 is transferred in the usual way to the cavity surrounding 

 the heart. 



AnuropuS) with its single species, the large and re- 

 markable Anuropus branchiatiis, Beddard, may have greater 

 claims to be the type of a distinct family, Anuropidas, 

 since, in addition to the conversion of the uropods into 

 branchial pleopods, and the absence of eyes, the first an- 

 tenna3 have only two joints, and the very short ' palp ' of 

 the maxillipeds consists of a single joint. 



As two of the genera of the Cirolanidas have thirty or 

 forty species between them, while the other three genera 

 have only a single species apiece, it is not unreasonable to 

 suppose that there may be many species of this family 

 either extinct or still undiscovered. Between Eurydice 

 and Cirolana the late M. Hesse, in 1866, places a new 

 genus, which he variously called Eucolumba and Eucolom- 

 ban, with two species named picta and ornatus. 



Family B. Corallanidce. 



Corallana, Dana, 1852, the single genus, contains some 

 fifteen or sixteen species from the Atlantic and Pacific. 

 The male of the species Corallana tricornis, Hansen, from 

 the West Indies, is ornamented by a large frontal horn 

 and two other large horns near the back of the head. The 

 epithet ' large,' however, is comparative, for these horns do 

 not approach in size the three processes of the head in 

 Ceratocephalus Grayanus, Woodward, among the Sphasro- 

 midaB. Since the type-species of Corallana, hirticauda, 

 Dana, was obtained from the coral reefs at Tongatabu, the 

 origin of Dana's generic name cannot be misunderstood. 

 At the same time it chimes in with the sound and com- 

 position of such names as Cirolana, Conilera, and Rocinela, 



