248 



CARL BOVALLIUS, AMPHIPODA HYPERIIDEA. I. 2. 



HYPERIID^. 



Genus 6. PARATHEMISTO, A. BOECK, 1870. 



Diagll. Caput mediocre, globosum. Perceon leve, epimeris distinctis instructum. Pedes percei primi 

 paris simplices, non subcheliforraes. Pedes secundi paris cheliformes; carpus paullo di- 

 latatus, valde productus, processus carpi anguste concavus, in formam cochlearis redactus. 

 Carpus pedum tertii ac quarti parium dilatatus, simul cum metacai'po, instrumentum pren- 

 sorium formans. Pedes parium trium ultimorum longitudine subsequales, duobus prae- 

 cedentibus multo longiores; carpus non dilatatus; metacarpus valde elongatus. Pedes uri 

 elongati. 



The head is moderately large, globular. The perceon is smooth, provided with distinct epi- 

 merals. The first pair of perceopoda are simple, not subcheliform. The second pair are 

 cheliform; the carpus is a little dilated, and much produced; the carpal process is narrowly 

 concave, gouge-shaped. The carpus of the third and fourth pairs is dilated, forming to- 

 gether with the metacarpus a folding hand. The last three pairs are subequal in length, 

 and much longer than the third and fourth pairs; the carpus is not dilated; the meta- 

 carpus is much elongated. The uropoda are elongated. 



Syn. 1870. Parathemisto, A. BOEOK. 



"Crustacea Amphipoda borealia et arctica». 



Christiania Videnskabs-Selskabs Porhandl. 



for 1870, p. 87 (7). 



1872. De Skandinaviske og Arktiske Amphipoder, 



p. 84. 



G. 0. Sars. 1882. »Oversigt af Norges Crustaceer med fore- 



]0bige Bemoevkninger over de nye eller 

 raiudre bekjaendte Arter». Christiania Vi- 

 denskabs Selskabs Forhandl. for 1882, 

 N:o 18, p. 20. 

 C. Bovallius. 1887 . "Systematical list of the Amphipoda Hyperii- 



dea». Bih. t. K. Sv. Vet. Ak. Handl. 



Bd. 11. N:o 1G, p. 20. 



» 1887. »Arctic and Antarctic Hyperids». Vega- 



Exp. Vetensk. lakttagelser. Bd. 4, p. 566. 



Th. Stebbing. 1888. "Report on the Amphipoda». Voy. of H. M.S. 



Challenger. Zoology. Vol. 29, p. 1419. 



The genus Parathemisto was instituted in 1870 b} 7 A. Boeck who gave the 

 following diagnosis : 



»Corpus sat compressum; dorso carinato. Mandibula? in apice perlata?, serratae, aaqve ut 

 mala interna; tuberculo molari latissimo, in margine crenato; palpo longissimo. Maxilla; 1 mi paris 

 dentibus quatuor perlongis et firmis armata?. Pedes 2di paris (non pedes Imi paris) carpo in 

 angulo inferiore posteriore valde producto; manu cheliformi. Pedes 3tii 4tiqve paris articulo 4to 

 subdilatato. Pedes trium parium ultimorum suba;qvales.» 



