370 



CARL BOVALLIUS, AMPHIPODA HYPER1IDEA. I. 2. 



PHRONIMIDjE. 



2. PHRONIMA SPINOSA, C. BOVALLIUS, 1887. 



PL XVI, fig. 8—18. 



Diagn. Caput segmenta quinque prima peraei longitudine fere sequans. Segmenta duo priora percei 

 segmento tertio baud altiora. Processus tibialis pedum percvi secundi paris dimidio stipite 

 carpi multo brevior. Pedes quinti paris pedes quarti paris longitudine asquantes; femur 

 curvatum; carpus longior quam latior; processus carpalis tuberculo marginis inferioi-is duplo 

 longior; tuberculus leviter incisus; metacarpus tuberculo lato instructus. Femur pedum 

 septimi paris angustum, femore pedum sexti paris duplo fere longius. Latera segmentorum 

 plei post acuta, non producta. Ramus internus pedum uri secundi paris dimidio rami ex- 

 tend paullo longior. 



The head is nearly as long as the five first pergonal segments together. The first two pe- 

 rcBonal segments ax'e hardly deeper than the third. The tibial process of the second pair 

 of perceopoda is much shorter than half the stem of the carpus. The fifth pair are about 

 as long as the fourth; the femur is S-curved; the carpus is longer than broad; the carpal 

 process is twice as long as the tubercle on the under margin of the joint; the tubercle is 

 broad, and is slightly notched; the metacarpus is provided with a broad tubercle on the 

 front margin. The femur of the seventh pair is nearly twice as long as that of the sixth. 

 The lateral parts of the pleonal segments are sharp-pointed, but. not produced. The inner 

 ramus of the second pair of uropoda is a little more than half as long as the outer. 



Colour. Hyaline. 



Length. 14—20 mm. 



Hal). The subtropical and tropical regions of the Atlantic; the Indian Ocean. (D. M.; 



S. M.) 



Syn. 1887. Phronima spinosa, C. BOVALLIUS. — »Systematical list of the Amphipoda 



Hyperiidea». Bih. t. K. Sv. Vet. 

 Ak. Handl. Bd. 11, N:o 16, 

 p. 25. 



» » » Th. Stebbino. 1888. »Report on the Amphipoda». Voy. 



of H. M. S. Challenger. Zoology. 

 Vol. 29, p. 1352. 



» » » 0. Chun. 1889. »Das Mannchen von Phronima se- 



dentaria nebst Bemerkungen fiber 

 die Phronima-Arten». Zoologi- 

 scher Anzeiger. 12 ter Jahrg. 1889, 

 p. 382. 



As I have said above Phronima spinosa is closely related to Ph. sedentaria, but 

 it is to be distinguished by the S-shaped femur in the fifth pair of perseopoda, and by 

 the inner ramus of the second pair of uropoda being shorter than the outer. As there 

 are only slight variations in the other organs from those in Pit. sedentaria, I shall restrict 

 myself to some few remarks only. 



