KONGL. SV. VET. AKADEMIENS HANDLINGAK. BAND. 21. N:0 5. 13 



Ovitectrices are present on the third to tlie sixtli pairs; tliey are large, very thin 

 laiuinaj, friiiged with some few distant thick hairs. 



The pleon in tlie niale equals the length of the last four j)ereional segments, but in 

 the female only the length of the last three and half the fourtli. The segments are equal 

 in length. The lateral parts are marked b}' a feeble keel, the continuation of the epimeral 

 line on the pereion. The hinder corners are obtusely rounded. 



The pleopodo (Pl. II, fig. 9) are well developed; the peduncles are robust and thiek, 

 longer than the rami. The outer rainus is 8 — 9-jointed, the inner 10 — 11-jointed. The 

 cilia3 are not longer than the rami, and not ])eduiiculated. 



The urus (Pl. II, tig. 10); the seeond and third segments are coalesecd, and as loTig 

 as the tirst, biit narrower. 



The uropoda; the inner rami ofall the pairs are seareely shorter than the eorresponding 

 peduncles; the exteriör rami of the tirst and seeond pairs are very minute, thosc of the last 

 pair are distinct, tinely seiTated along the inner margin, shorter than half the interiör rannis. 

 The first pair are mimitely serrated along the onter margin and slightly but more coarsely 

 along the upper two thirds of the inner maj-gin; the seeond pair are smooth along the 

 outer, and linely serrated along the innei- margin. The third pair are smooth on the 

 whole inner margin and on the outer margin of the peduncle, but tinely serrated along 

 the outer margin of the interiör rannis. The last pair reach beyond the tirst pair. The 

 uropoda eontain distinct glands. 



4. TYRO ATLANTICA, C. BOVALLIUS, 1885. 



Pl. Il, fig. 11—18. 



Diagu. Curjius leviter fjariiiatuui. Capnt puiillu altius quani longius, supernc carinatuin, cariiiis 

 divergentibuy. Antennw priiui paris corpore pavillo breviores. Pedes ^jereii prinii \rdris 

 carpis haud elongatis. Pedes quinti paris pedibus sexti inulto longiores; fenuir antc non 

 serratura, leve, post distincte seiTatuin, articulis tribus seiiuentilHis brevius, spiuani rectam, 

 genu paullo longioreiu, gei-ens; tibia carpo inulto brevior; carpus luetacarpo duplo lougior. 

 Pedes septimi paris tertiain partem longitudinis pedum quinti paris superantes. Segmenta 

 iiri duo ultima coalita. Pedes uri lati, iniuute serrati; rauii exterui priuii et secuiuli 

 parium parvi, rami extern! tertii paris magni, pedunculo paullo breviores. Kami interni 

 trium parium pedunculis multo longiores. Telson anguste lingulatum, dimidium rami cx- 

 terni tertii paris haud icquans. 



The budij is feebly keelcd. The liead is a little deeper tiian loug, provided on the upjier 

 side with two divergent keels. The first pair of antennw are a little shorter than the body. 

 The first pair of pereiopoda with the carpi not elongated. The fiftli pair are mucli longer 

 than the sixth; the anterior margin of the femur smooth, not serrated, the posterior distinctly 

 serrated; it is shorter than the three following joints together: the ajjical spine-like process 

 is a little longer than the genu, straight; the tibia is much shorter than the carpus; the 

 carpus is seareely twice longer than the uietacarjius. The seventli pair are longer than a 



