24 Carl Bovallius, 



Triscliizostoma Raschii. A. BOECK, i860. 



Syn. 1860. Triscliizostoma Raschii. A. BOECK. Forhandl. ved de Skandinaviske Natur- 



forskeres 8:de Mode. p. 6.37. 

 1870. ,, „ ,, »Crustacea aniphipoda borealia et arctica». 



p. 11. in Christ. Vidensk. Selsk. Por- 

 handlinger for 1870. 

 1872. ,, „ ,, De skandinaviske og arktiske Amphipo- 



der. p. 97. 4:to. 



Diagn. Caput cum rostro segmento primo pereii brevius. 



Antennœ primi paris flagello decem-articvilato, articulo primo sequentibus lou- 



gitudine sequante. Flagellum secundarium tri-articulatum. 

 Genu paris secimdi jieclum fereii perlongum, longitudine carpum superans; 



dactylo minimo. Tibia paris quarti longitudinem femoris sequans. 

 Epimera segmentorum secundi, tertii et quarti permagna, epimerum segmenti 



secuudi maximum, triaugulatum. 

 Pedes uri secundi paris apicem ultimi paris attingentes. 

 Telson rotundatura, pedunculo pedum uri. ultimi paris longius. 



The head with the rostrum shorter than the first pereional segment. 



The flagellum of the first pair of antennœ ten-jointed, the first 

 joint as long as the following together. The secondary flagellum is 

 three-jointed. 



The genu of the second pair of pereiopoda is very long, longer 

 than the carpus; the dactylus is very small. The tibia of the fourth 

 pair equals the length of the femur. 



The epimerals of the second, third, and fourth segments are very 

 large, that of the second segment is the largest, triangular. 



The second pair of uropoda reach to the end of the third pair. 

 ' The telson is rounded, longer than the peduncle of the last pair 



of uropoda. 



The description of Boeck is not quite accurate; it seems that he 

 has taken some characteristics from the adult animal and others from 

 very young ones; the drawings given by him do not always agree with 

 his description; on this account it seems convenient to give here also 

 figures of some details of a younger specimen for comparison with the 

 same organs in the adult animal. The specimens described here were 

 taken by me at »Tjöttö», Northern Norway, from a depth of 80 fathoms 

 July 1871, and in »Hardanger fjord» south-western coast of Norway, 

 July 1880. 



