THE AMPHIPODA. 23 



exactness. The species Scina Chnni, Garbowski, figured and described in that author's 

 very imj)ortant treatise on the SoinidoB, cannot be distinguished from tlie earlier Scina 

 stenopns publislied in the Trans. Zool. Soc. London, 1895. S. longipes (Dana) remains for 

 the present obscure. As observed by Dr. Garbowski, no weight can be attaclied to such a 

 character as the angukr prominence which Dana depicts and speaks of as representing the 

 medio-frontal margin of the head. Dana regards the fifth and sixth segments of the pleon 

 as separate. In these pellucid animals the ventral dividing-line may easily be mistaken 

 for a dorsal division. Scina spinosa, Vosseler, 1901, founded on a female specimen 

 3"5 mm. long, " perhaps not quite full-grown," should not, I think, be separated from 

 S. imcipes, which I founded in 1895 on a male specimen 7 '5 mm. long, this being, to 

 judge by the second antennae, almost completely mature. Scina Lamperti, Vosseler, 

 1901, which, like S. oedicarpus, has the second joint of the third pergeopods longer than 

 all the rest of the limb, is distinguished by an approach to a subchelate ending of the 

 first and second peraeoj)ods. One of these is represented by Yosseler (pi. 9. figs. 3, 3 a), 

 but referred to in the ' Tafel-Erklaruug ' as " Zweites Brustbein," which would indicate 

 the second gnathopod. Other sjiecific names not included in the tabular view are 

 mentioned in the following notes on accepted species. 



f First aHtennje considerably longer than body. 2. 



^ First antennse little or not at all longer than body. 4. 



rPrp. 3, second joint longer than following joints combined . . 1. S. mdicarpus,^ie\)hva.g. 



^ Prp. 3, second joint not longer than following joints combined. 3. 



j" First antennte stoiit 2. S. crassicornis (Yahncini). 



C First antennse slender 3. S. stenopus, ^iehh'm^. 



("First and second gnathopods, apex of sixth joint produced. 5. 

 First and second gnathopods, apex of sixth joint not produced. 6. 



f Prp. 5 more than half the length of prp. 4 4. -S. marginata (Bovallius). 



' '- Prp. 5 much less than half the length of prp. 4 5. -S. incerta, Chevreux. 



f Prp, 3, second joint with front margin dentate only at apex. 7. 



t Prp. 3, second joint with front margin dentate not only at apex. 10. 

 „/ Prp. 3, second joint with apical tooth bifid 6. /S. pac/^ca (Bovallius). 



*- Prp. 3, second joint with apical tooth simple. 8. 



f Prp. 4, fifth joint shorter than fourth or sixth 7 . S. simiiis, Stebbing. 



' l Prp. 4, fifth joint longer than fourth or sixth. 9. 



f Telson triangular 8. S. Tullberffii (Boynllim). 



'iTelson truncate 9. S. concurs, Stehhing. 



/Prp. 3, second joint with few teeth on front margin . . . . 10. S. Rattrayi, Stebbing. 

 " t. Prp. 3, second joint with many teeth on front margin. 11. 



f Prp. 3, second joint longer than following joints combined . . 11. S. Lamperti, Yosaelet 



'^ Prp. 3, second joint shorter than following joints combined. 12. 



j Prp. 3 not longer than prp. 4. 13. 

 Prp. 3 longer than prp. 4. 14. 



r Prp. 3 with sixth and seventh joints short 12. S. C7aH.W« (Bovallius). 



" V. Prp. 3 with sixth and seventh joints long 13. S. lepisma (Chun). 



f Prp. 5 slender 14. S. bnrealis (S&ra). 



'- Prp. 5 robust 15. .S. «»ci/>e«, Stebbing. 



^•If 



'Hv 



