678 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 55, 



Type of the genus. — Rehelula edwardsii (Kolliker), monotypic. 

 {Rehelula, to Dr. H. Eebel, of Vienna.) 



Remarks. — The distinguishing characters of this genus in the 

 female are the soft cylindrical cephalothorax, the narrow chitin 

 neck with its armature of knobs, processes or horns, the posterior 

 processes covered with respiratory cylinders, and the profusely 

 branched intestinal outgrowths in the anterior trunk. In the male 

 the characteristic features are the oblique truncation of the head, the 

 spherical enlargements for the testes, and the elongated fused basal 

 joints of the maxillipeds. 



The genus was first described under the name Lophoura by Kolliker 

 in 1853 ; Claus added some details and gave a figure of the adult fe- 

 male in 1860, and in 1865 Cornalia i3ublished a detailed account with 

 numerous figures, both of which were so accurate as to leave no doubt 

 of the identity of the species. Poche in 1902 called attention to the 

 fact that the name Lophura had been preoccupied for a genus of birds 

 in 1822 and a genus of reptiles in 1840, and suggested the name 

 Rehelula as a substitute. 



In 1912 Brian in the Resultats des Campagnes Scientifiques du 

 Prince de Monaco, Fascicle 38, again described (p. 28) and figured 

 (pi. 4, figs. 3 and 4; pi. 8, fig. 4, a-d) Kolliker's species, which had 

 been obtained from Maorourus atlanticus Lowe, in the Bay of Bis- 

 cay. He found a number of differences in the details of the head 

 and neck, and discovered the maxillae behind the mouth tube, but 

 failed to find any of the other appendages. 



In the same j^ear Quidor discovered what he claimed to be a new 

 genus upon a Macroums from the Sudan coast in Africa, and which 

 he named Hepatophylus. This proves to be not a new genus, but a 

 new species of the present genus, and is identical w^ith those enu- 

 merated below from the same host. Males of this genus are here 

 described for the first time. 



ABTIFICIAL KEY TO THE SPECIES. 



Cephalothorax short, wide, transversely wrinkled ; neck armed with branched 

 horns ; genital segment obcordate ; posterior processes long and covered with 

 cylinders cornuta, new species, p. 582. 



Cephalothorax long, wide, smooth ; head separated by a deep constriction ; neck 

 armed with four unbranched* knobs ; genital segment quadrate ; posterior 

 processes short, covered with cylinders edwardsii (Kolliker), 1853, p. 586. 



Cephalothorax long, narrow, smooth ; neck armed with three spherical pro- 

 cesses or four short, unbranched horns ; genital segment obcordate ; posterior 

 processes short, covered with cones 'bouvieri (Quidor), 1912, p. 579. 



Cephalothoi'ax filose, ten times as long as wide; neck twisted and armed with 

 small, irregular knobs ; posterior processes short and covered with cones. 



gracilis, new species, p. 585 



