48 Carl Bovallius, The Oxycephalids. 



Syn.^) 1861. Simorhyuchus. C. Claus. 25^2), p. 156. 



» 1879. 27, p. 188 (42). 



» 1887. 36, p. 65. 

 1888. Simorhynchotus. jTh. Stebbing. 39, p. 1572. 



When Claus in 1861 instituted the genus Simovhynchus he placed 

 it in the family Oxycephalidae; in 1879 he removed it from this fa- 

 mily and put it among the Lycœidœ. In my opinion however it must 

 be regarded as an Oxycephalid, so I have placed it here as the first 

 genus of the family Oxycephalidge, chiefly for the reason that the 

 mouth-organs agree with those in the Oxycephalidge in the form of 

 the mandibles and maxillipeds, and in the rudimentary state of the 

 maxillœ. Also in the form of the last five pairs of peraeopoda there is 

 a great resemblance between this genus and the genus Oxycephalus. It 

 is however a link between the Oxycephalidge and the Lycœidœ, con- 

 necting these two families for which it is so hard to find good distin- 

 guishing characteristics, since the principal characteristic used by Claus, 

 namely the elongation of the head, is so very gradual; the best charac- 

 teristic is without doubt the presence of maxillae in the Lycœidœ, but it 

 is of no value for external examination. 



Claus' name Simovhynchus was changed in 1888 to Simorhynch- 

 otus by Stebbing, because the former name was found to have been 

 previously applied to a genus of birds. 



The species established by Claus in 1861 was S. antennarius, 

 the next new species was S. Lilljeborgi, proposed by me in 1887 

 (35, p. 34), and here I describe a new species S. Stebbingi. 



The three species are easily distinguished, as is shown below. 



A. The head is produced into a short, obtuse rostrum. 



The telson is acute at the apex. 



a 1. The outer ramus of the second pair of 



uropoda is about as long as the peduncle. 1. S. autennarius. 

 a 2 The outer ramus of the second j)air of 



uropoda is much shorter than the peduncle. 2. S. Stebbingi. 



B. The head is rounded in front, not produced into a 



rostrum. The telson is rounded at the apex. 3. S. Lilljeborgi. 



1) For a more complete synonymy of this and the following genera and species 

 see: C. Bovaluus, Contributions to a Monograph of the Amphipoda Hyperiidea, I, 3. 



2) This and the following similar figures in the lists of synonyms and in the 

 text refer to the bibliographical list above, p. 2—10. 



