16 CARL B0VALL1US, AMPHIPODA HYPERIIDEA. 



1850. Clydonia longipes, DANA. Th. H. Streets. 1877. "Contributions to the natural history of 



the Hawaiian and Fanning Islands and 

 Lower California.)) Bulletin of the United 

 States National Museum-. 1877. N:o 7, 

 p. 124. 

 Tyro » » C. Bovaluus. 1887. "Systematical list of the Amphipoda Hy- 



periidea». Bib. t. K. Sv. Vet. Ak. Handl. 

 Bd. 11. N:o 16, p. 5. 



Streets does not attempt to prove the identity of his species with Dana's, but as 

 it does not agree with any other of the known species I cite it here, using only the 

 characteristic of the uropoda to complete Dana's decription. 



Dana says: 



There is a prominent angle on front of head and a low angle over each of the 

 antennae; but the front angle is not apparent in a vertical view, as the front margin, 

 which is in advance of the angle, is depressed below the upper surface of the head. 



The eyes are as in Tyro gracilis. 



The first pair of antennae are nearly as long as the body, a little stouter than in 

 Tyro gracilis. 



In the second and third, pairs of pereiopoda the carpus is longer than either the 

 tibia or metacarpus. 



The seventh pair are longer than half the fifth. 



The posterior angles of the first two pleonal segments are acute, not truncated. 



Streets says: 



The first pair of uropoda are longer than the second; both are lanceolate in shape, 

 and serrated along their edges. The third pair are linear, and of the same length as the 

 first pair. The third pair carry exterior rami, articulating just above the middle of the 

 outer edge and reaching exactly to the half of the interior ramus. 



6. TYRO BOREALIS, G. 0. SARS, 1882. 



Diagn. Corpus depressum, non carinatum. Caput duplo altius quam longius, supine applanation, 

 lobis lateralibus minutis rotundatis. Antenna; primi paris dimidiam corporis longitudinem 

 baud assequentes. Pedes pereii primi et secundi parium carpis elongatis. Pedes quinti 

 paris pedibus sexti multo longiores; femur ante et post, fortiter serratum, articulis tribus 

 sequentibus multo brevius, spinam curvatam, genu longiorem, gerens; tibia carpo paullo 

 brevior, carpus metacarpo paullo longior. Pedes septimi paris tertiam partem longitudinis 

 pedum quinti paris haud assequentes. Segmenta iiri duo ultima coalita. Pedes uri lati, 

 minute serrati; margines interni pedum primi paris spinif'eri. Rami externi trium parium 

 minutissimi, rami interni pedunculis longiores. Pedes primi paris ceteris longiores. Telson 

 minimum, trianeulare, acuminatum. 



