KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 21. N:0 5. 



21 



8. TYKO MARGINATA, C. BOVALLIUS, 1885. 



Pl. III, Hg. 18—33. 



Diagn. Goi-pun non carinatuni, lateribus marginatis. Caput duplo altiiit* qiiam longius, superne 

 carinatuni, carinis divergentibus. Atäennw primi paris dimidio corporis breviores. Fedes 

 pereii primi et secundi pariuni nietacarpis ante productis. Pedes quinti pai-is pedibiis 

 sexti paris multo longiores; fenuir ante fortiter, post leviter serratum, articulis tribus 

 sequentibus multo brevius, spinam rectam validissimam, genu quinquies longiorem, gerens; 

 tibia carpo paullo brevior; carpus inetacarpo paullo longior. Pedes septimi paris dimidio 

 loDgitudinis pedum quinti paris paullo breviores. Dactyli parium trium ultimorum curti, 

 validi, fortiter curvati. Segmenta uri duo ultima coalita. Pedes uri lati, partim fortiter 

 serrati; rami externi primi paris parvi, secundi paris longi, augusti; tertii paris magni, 

 duas partes longitudinis pedunculi superantes. Rami interni primi et secundi parium 

 pedunculis valde longiores, rami secundi paris margine interiore excavato; rami interni 

 tertii paris pedunculos aequantes. Tehon minimum, rotundatum. 



The body is not carinated, the lateral jiarts with a distinct margo. The head, is twice deeper 

 than long, keeled on the upper side, the keels divergent. The first pair of aiäeniia: are 

 shorter than half the body. The first and second pairs of pereiopoda with the metacarpi 

 produced anteriorly into sharp processes. The fifth pair are much longer than the sixth; 

 the anterior margin of the femur strongly, the posterior feebly serrated; the fenuu* is 

 much shorter than the three following joints; the apical spine-like process is straight, vcry 

 strong, five times longer than the genu; the tibia is a little shorter than the carpus; the 

 carpus is a little longer tlian the metacarjius. The seventh pair are scarcely longer than 

 half the fiftli pair. The dactyli of the last three pairs are short and robust, strongly curved. 

 The last two ural segments are coalesced. The uropoda are broad, partly strongly serrated. 

 The exteriör rami of the first pair are small, those of the second pair long, narrow; those 

 of the third pair are longer than two thirds of the length of the peduncles. The interiör 

 rami of the first and second pairs are much longer than the peduncles, those of the second 

 pair with the inner margin excavated; the interiör rami of the third pair are as long as 

 the peduncles. The tehon is very small, rounded. 



Coloiir. White. 



Lengtli. ti mm., without antennas 4 uuu. 



Hal). The Mediterranean; capturod at Messina by Professor W. Leche. (S. M.). 



Syn. 1885. Ti/ro munjinata, C. BOVALLIUS. »On some forgotteii genera anioiig the Amphipodous 



Crustacea». Bill. t. K. Vet. Ak. Handl. Qå. 10. 

 N:o 14, p. 15. 

 » » » 1887. »Systematical list of tUe Arapliipoda Hypeiiidea». Bih. 



t. K. Vet. Ak. Handl. Bd. 11. N:o 16, p. .5. 



Ty ro marginata is a very wcll dcfiucd species, which is at once distinguished from 

 its allies by the sharp metacarpal processe.s of the first two pairs of pereiopoda, the long 

 and strong femoral process of the fifth pair, the peculiar form of the dactyli of the last 

 three pairs, and the dilated, almost tumid joints of the same pairs of pereiopoda. 



