18 CARL BOVALLIUS, AMPHIPODA HYPERIIDEA. 



The lateral margins of the head project into a small rounded process on each 

 side at the lower corners of the bases of the first pair of antennae; on these lobes the eyes 

 are situated. 



The eyes are small, rounded, of a red colour. 



The first pair of antennce consist of a large, one-jointed peduncle, equalling a fifth 

 of the length of the flagellum. The first joint of the flagellum is long, conical with 

 serrated margins arid some few long hairs, the rest of the flagellum consists of a few 

 short joints. 



The second pair of antenna 7 are rudimentary in the female; in the male they are 

 similar to those of Tyro Sarsi. 



The mouth-organs; the mandibles are laminar, the sharp incisive margo with 3 — 4 

 minute teeth. The second pair of maxilUe are not hirsute. The maxillipeds with simple 

 lamina?, without hairs, lanceolate. 



The pereion is a little tumid, more tumid in the female than in the male; the last 

 three segments are shorter than the first four (16:19). 



The first two pairs of pereiopoda are long with the carpi elongated and the dactyli 

 straight. The third and fourth pairs with narrow metacarpi and very small dactyli. The 

 fifth pair are provided with unusually long metacarpi and minute dactyli. The seventh 

 pair are small without hairs, shorter than a fourth of the fifth pair. 



The pleon is a little longer than the last three pereional segments; the lateral parts 

 are deep, evenly rounded. 



The peduncles of the pleopoda are as long as the rami. 



The first pair of uropoda reach beyond the last, the interior margins are very 

 strongly serrated, the teeth long, spine-like. The second pair reach to the end of the 

 last pair. 



7. TYRO CLAUSI, C. BOVALLIUS, 1885. 



PI. II, fig. 19—28. 



Diagll. Corpus non carinatum. Caput plus quam duplo altius quam longius, superne carinatum, 

 carinis divergentibus. Antennce priini paris dimidio corporis paullo breviores. Pedes pereii 

 primi paris carpis elongatis. Pedes quiuti paris pedibus sexti paris longitudine asquales vel 

 paullo breviores; femur, ante et post spinulose serratum, articulis tribus sequentibus haud 

 brevius, spinam gracilem fere rectam, genu longiorem, gerens; tibia carpo multo brevior, 

 carpus metacarpo sexies fere longior. Pedes septimi paris dimidium longitudinis pedum 

 quinti paris agquantes. Segmenta uri duo ultima coalita. Pedes uri lati, minute serrati, 

 margines interni pedum primi paris spinulose serrati. Rami externi primi et secundi 

 parium minutissimi, tertii paris permagni, longitudinem pedunculi aequantes, ramis intei'nis 

 paullo breviores. Rami interni duorum parium ultimorum pedunculis multo longiores. 

 Pedes primi paris ceteris breviores. Telson triangulare, tertiam partem longitudinis rami 

 externi ultimi paris superans. 



