BIHANG TILL K. SV. VET.-AKAD. HANDL. BAND 10. N:0 14. 15 



3. Tyro marginata, n. sp. 



The head is nearly as long as deep. The upper antennae 

 are straight and reach to the anterlor margin of the third 

 pleonal segment. The epimerals distinct, the upper line form- 

 ing a proeminent margo; the fifth pair of pereiopoda are 

 longer than the sixth, the femur longer than the three fbl- 

 lowing joints; the seventh pair are much shorter than half 

 the fifth. The first pair of nropoda are long, reaching beyond 

 the end of the second to the end of the third, finely serrated 

 at the interiör margin. The exteriör ramus of the last pair 

 of uropoda is longer than half of the coalesced interiör one. 

 The hinder corners of the two first pleonal segments are 

 rounded, those of the last truncated. 



Hab. The Atlantic. 



4. Tyro Sarsii, n. sp. 

 (Fig. 3 and 3 a). 



The head is not fully twice as deep as long. The upper 

 antennae straight, reaching beyond the anterior margin of the 

 second pleonal segment. The epimerals are distinct. The 

 fifth pair of pereiopoda are longer than the sixth, the femur 

 as long as the three following joints. The seventh pair are 

 nearly as long as half the fifth. The first pair of uropoda 

 are long, reaching beyond the end of the second, but not to 

 the end of the third, feebly serrated at the interiör margin. 

 The exteriör ramus of the last pair of uropoda is scarcely 

 half as lono- as the coalesced interiör one. The hinder corners 

 of the two first pleonal segments are rectangular, those of the 

 last truncated. 



Hab. The Atlantic. 



5. Tyro Tullbergii, n. sp. \ 



The head is twice as deep as long. The upper antennsfev 

 straight, robust, short, not reaching to the hinder margin of 

 the third pereional segment. The epimerals are distinct. The 

 fifth pair of pereiopoda are longer than the sixth, the femur 

 is shorter than the three following joints. The seventh pair 

 are shorter than the femur of the fifth. The first pair of uro- 

 poda reach beyond the second and nearly to the end of the 



