18 CARL ROVALMUS, AMPHIPODA IIYPERIIDEA. 



'J^he lateral margins of the head project into a small rounded process on each 

 sidc at tlu! lower corners of the bases of the first pair of antennas; on these lobes the eyes 

 are situated. 



The e^/es are small, rounded, of a red colour. 



The fi.rst pair of antenmc consist of a large, one-jointed peduncle, equalling a fifth 

 of tlie length of the flagellura. The tirst joint of the flagellum is long, conical with 

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

 short joints. 



The second pair of antennrp are rudimentary in the female; in the inale thej' are 

 similar to those of Tyvo Sarf^i. 



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

 rainute teeth. The second pair of maxillre are not hirsute. The maxillipeds with simple 

 laminai, without hairs, lanceolate. 



The jJ^r^ion 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 ^vithout 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 interiör margins are very 

 strongl);' serrated, the teeth long, spine-like. The second pair reach to the end of the 

 last pair. 



7. TYRO CLAUSI, C. BOVALLIUS, 1885. 



Pl. II, fig. 19—28. 



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

 carinis divergentibus. Aiitennce primi paris dimidio corporis paidlo breviores. Pedes 2^fi'en 

 primi paris carpis elongatis. Pedes quinti paris pedibus sexti paris longitudine ajquales vel 

 pauUo breviores; femiir, ante et post spinulose serratum, articulis tribus sequeutibus 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 requantes. Segmenta nri duo ultima coalita. Pedes uri lati, minute serrati, 

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

 l)arium miiuitissinii, tertii paris perniagni, longitudineni pedunculi »quantes, ramis internis 

 paullo breviores. Rami interni duorum pai-ium idtimoruin pedunculis multo longiores. 

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

 externi ultimi paris superans. 



