CAKL BOVALLIU.S, AMPHIFODA IIYPERIIDEA. 



Tlic fcmiir of thc sixtli pair ui' pereiopoda morc ur Ichh uperculiform, 



tlio rest of thc Icf^ articulating .subterininally. 

 CC 3. The feimir of thc fifth pair of pereiopoda normal, not uper- 

 culiform 14. l'ronoiil%. 



CC 4. The fcmur of thc fifth pair of pereiojjoda operculiform. 



CCC 3. Thc sevcnth pair of pereiopoda complete, six-jointed ... i». Parascelidx. 

 CCC 4. Thc scventh [)air of jiereiopoda rudimentary, one- or few- 



jointed 16. Eutyphitlie. 



The iirst family, TYRONIDjE, C. BOVALLIUS, 1887. 



Diagn. Caput parvum, non tumidum. Ocidi parvi vel obsoleti. Antennce primi paris rectae, parti 

 anteriori capitis affixse, flagello styliformi instructa;. Antennje secundi paris angulatae, parti 

 inferiori capitis affixa3. Insti-umenta orts masticatoria; mandibulse palpo carentes. Pedes 

 pereii ambulatorii, pedes septimi paris non transformati. Fedes uri ramis instructi. 



The head is small, not tumid. The eyes are small or indistinct. The first pair of antennm 

 are straight, fixed at the anterior side of the head, the flagellum is styliform. The second 

 pair are angulated, fixed at the inferior side of the head. The mouth-orgaus are adapted 

 for mastication; the mandibles without palp. The, pereiopoda are walking legs; the seventh 

 pair are not transformed. The uropoda are provided with rami. 



Syn. 185,2. CovopMdce, Subf. 1. CLydonina. DANA. 



1862. Uorophiidce, Subf. 2. Corophiides (e. p.). SPENCE BATE. 



1887. Tyronidae 



C. BOVALLIUS. 



United States Exploring Expedition. 



Crustacea. Vol. 2, p. 833. 

 Catalogue of the specimens of Amphi- 



podous Crustacea in the collection 



of the British Museum, p. 273. 

 xSystematical list of the Amphipoda 



Hyperiidea». Bih. t. K. Sv. Vet. 



Ak. Handl. Bd. 11. N:o 16, p. 3. 



The Iirst species of this family which was described, was H. Milne Edwards' Hy- 

 peria cornigera in the year 1830. In 1840 the name was changed by -himself into Tyro 

 corniqera. The next additions to the family were made by Dana in 1850, viz. Clydonia 

 gracilis and C. longipef. But in 1852 Dana, not recognizing the identity of Tyro and 

 Clydonia, placed his new species among the Amphipoda Gammaridea as the first sub-family, 

 Clydonince, of the family Corophidce. Spence Bate in 1862 followed Dana in placing 

 Clydonia among the Corophids, but as he did not accept the sub-family Clydonhia;, he 

 connected the genus more closely with the Corophidw than Dana himself. At the same 

 time (1. c. p. 308) he mentions the genus Tyro, ranging it with the family Hyperidce 

 between the geneva Cyllopus and Dairinia. Th. H. Streets^) completed in 1877 the 

 description of Dana's Clydonia longipes, and described the form of the second pair of 

 antennas. In the year 1882 G. O. Särs described a new Clydonia from the North 



') »Contributions to the Natural Historv of the Hawaiian and Fanning Islands and lower California» 

 Bulletin of the United States National Museum, N:o 7. Washington, 1877. 



