CARL BOVALLIUS, AMPHIPODA HYPERIIDEA. 



C 2. The femur of the sixth pair of pereiopoda more or less operculiform, 

 the rest of the leg articulating subterminally. 

 CC 3. The femur of the fifth pair of pereiopoda normal, not oper- 

 culiform _ 14. Pronoidse. 



CC 4. The femur of the fifth pair of pereiopoda operculiform. 



CCC 3. The seventh pair of pereiopoda complete, six-jointed ... 15. Parascelidse. 

 CCC 4. The seventh pair of pereiopoda rudimentary, one- or few- 

 jointed 16. Eutypkitlse. 



The first family, TYROMDJE, C. BOVALLIUS, 1887. 



Diagn. Caput parvum, non tumidum. Ocull parvi vel obsoleti. Antenna? primi paris rectas, parti 

 anteriori capitis affixa?, flagello styliformi instructa?. Antennas secundi paris angulatas, parti 

 inferiori capitis affixa;. Instrumenta oris masticatoria; mandibular palpo carentes. Pedes 

 pereii ambulatorii, pedes septimi paris non transformati. Pedes uri ramis instruct!. 



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

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

 pair are angulated, fixed at the inferior side of the head. The mouth-organs 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. 1852. Corophidce, Subf. 1. Clydonince. DANA. United States Exploring Expedition. 



Crustacea. Vol. 2, p. 833. 

 1802. Corophiidce, Subf. 2. Corophiid.es (e. p.). SPENCE BATE. Catalogue of the specimens of Amphi- 



podons Crustacea in the collection 



of the British Museum, p. 273. 

 1887. Tyronidce C. BOVALLIUS. "Systematical list of the Amphipoda 



Hyperiidea». Bih. t. K. Sv. Vet. 



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



The first 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 

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

 gracilis and C. longipes. 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 lie did not accept the sub-family Clydonince, he 

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

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

 between the genera Cyllopus and Dairinia. Th. H. Streets 1 ) completed in 1877 the 

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

 antennae. In the year 1882 G. O. Sars described a new Clydonia from the North 



J ) "Contributions to the Natural History of the Hawaiian and Fanning Islands and lower California" 

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



