320 CAUL BOVALLIUS, AMPHTPODA HYPERIIDEA. I. 2. HYPERIIDiE. 



Phronimopsis Sarsi. 



3. The femur of the fifth pair of perteopocla being longer, — or shorter, than the carpus. 



4. The uropoda being fringed with hairs, — or smooth. 



One would easily be inclined to suspect that the inflated peraeon is only a sexual 

 feature, but as Claus expressly gives it as characterizing the male as well as the female 

 of his species it must be considered a specific characteristic in this genus. 



The question of the morphological homologies of the joints in the second pair of 

 peraeopoda is difficult to clear up; I have called the leg dactylo-chelate, thereby sug- 

 gesting that the metacarpus has assumed the form and function usually appertaining to 

 the carpus, and the dactylus that of the metacarpus. Perhaps it might be more proper 

 to say that the tibia is divided into two joints, but it must be noticed that independent 

 muscles are developed in both. 



The species are to be distinguished as the following table shows. 



A. The margins of the uropoda are fringed with hairs. The person is not inflated. 

 a 1. The telson is shorter than a sixth part of the peduncle of the last pair of 



uropoda. The outer ramus is about as long as the inner '... 1. Ph. Sarsi. 



a 2. The telson is a fourth part as long as the peduncle of the last pair of uro- 

 poda. The outer ramus of the second pair is much shorter than the inner 2. Ph. tcuella. 



B. The margins of the uropoda are smooth. The person is globularly inflated 3. Ph. spiuifera. 



1. PHRONIMOPSIS SARSI, C. BOVALLIUS, 1887. 



PL XIV, fig. 1—29. 

 The name is given in honour of Professor G. 0. Sars of Christiania. 



Diagll. Caput segmentis quattuor primis peraei longius, paullo altius quam longius. Perason non in- 

 flatum; segmenta duo ultima in dorso leviter producta. Pedesperm secundi paris pedibus 

 primi paris paullo longiores, apicem carpi pedum tertii paris haud attingentes. Femur 

 pedum quinti paris carpo non longius. Rami pedum uri marginibus fimbriates; ramus 

 externus internum longitudine fere asquans. Telson sexta parte pedunculi pedum uri ultimi 

 paris brevior. 



The head is longer than the first four pergonal segments together, and is a little deeper than 

 long. The pereeon is not inflated; the last two segments are dorsally feebly produced in 

 the median line. The second pair of perceopoda are only a little longer than the first, and 

 do not reach to the apex of the carpus in the third pair. The femur of the fifth pair is 

 not longer than the carpus. The rami of the uropoda have the margins fringed with fine 

 hairs; the outer ramus is about as long as the inner. The telson is not a sixth part as 

 long as the peduncle of the last pair of uropoda. 



Colour. Reddish white, almost hyaline. 



Length. 5 — 6 mm. 



