8 



CARL BOVALLTUS, AMFITIPODA IIYPERIIDEA. 



The dactyli of the third and fourth pairs are very strong. 



The fifth pair are the longest; the femur is denticulated along the posterior margin, 

 and armed with a strong, tooth-like spine at the lower anterior corner. The metacarpus 

 and the dactylus are filiform. 



The seventh pair are very small and slender, scarcely adapted for locomotion. 



The uropoda are very slender, the exterior rami are obsolete. 



■2. TYRO GRACILIS, DANA, 1850. 



mLU 



WRXf vvk 



Tyro gracilis, Dana. 



Facsimile from "Dana. U. S. Expl. Exp. Crust, II, pi. , r >. r >, fig. 0. 



Diagn. 



Octili parvi, lenticulis novem. Antenna' primi paris corporis i'ere longitudine, subulata;. 

 Pedes pereii quinti paris corpore non breviores, f'einore longissimo, post minute spinoso, 

 apice spinose product©. Pedes septimi paris pedibus quinti paris plus dimidio breviores. 

 Segmenta plei latere acuta, angulo postieo subtruncato. Segmenta uri duo ultima libera, 

 non coalita. Pedes uri tenues, pedes primi et tertii parium pedibus secundi paris longiores. 

 Pedes tertii paris ramum externum brevem acutum ferunt. 



The eyes are small, with nine ocelli. The first pair of antenna' are about as long as the 

 body. The fifth pair of pereiopoda are as long as the body; the femur is very long, 

 minutely spinulous along the posterior margin, the apex produced into a spine-like process. 

 The seventh pair are shorter than half the fifth. The lateral parts of the phonal segments 

 are sharp, the posterior corners subtruncate. The last two aval segments are free, not 

 coalesced. The uropoda are slender, those of the first and third pairs are longer than 

 those of the second pair. The third pair are provided with a short, sharp, exterior ramus. 



Colour. Reddish in irregular spots, the antenna? are in part reddish. 

 Length. 9 mm. 



Hab. The Atlantic; Lat. 1 N. Long. 18° W. (Dana). 



