ö c. BOVALLIUS, NOTES ON PTERYGOCERA ARENARIA, SLABBER. 



secondary flagellum. The inferior antennse have the second 

 and fourth joints enlarged in a winglike process, wherefrom 

 the name Pterygocera. The Gnathopoda are not subchelate. 

 The two first pairs of pereiopoda have the last joints extra- 

 ordinarily transformed, the propus being broadly spoonshaped 

 and movable transversally against the process of the carpus. 

 expanded in a laminar crest, so as to form a kind of doiible 

 scoop or pair of tongs, forceps, fitted for catching objects in 

 the fine sand. 



The joints of the three last pairs of pereiopoda are deve- 

 loped in broad expanded lamince sheltering the posterior part 

 of the body as well as serving as instruments of digging. 



The last segment of the pleon is strongly developed, as 

 long as both preceding taken together, broadly cylindrical. 

 The whole urus is sheltered under it. 



The telson is broad, deeply incisved. Of this family only 

 one species is known: 



Pterygocera arenaria. Slabber 1778. 



Syn. Oniscus arenarius. Slabber 1778 (1). 



Oniscus (Haustorius) arenarius. St. Muller 1781 (2). 



Oniscus arenarius. Latreille 1818 (3). 



Pterygocera arenaria. Latreille 1825 (4). 



Pterygocera arenaria. Guérin-Meneville 1827 (8). 



Bellia arenaria. Spence Bate 1861 (11). 



Sulcator arenarius. SPENCE Bate 1854 (12), 1855 (13), 1857 (14). 



1858 (15), 1862 (16), 186.3 (17). 

 Sulcator arenarius. Ph. H. Gosse 1855 (20). 

 Sulcator arenarius. A. White 1857 (21). 

 Sulcator arenarius. A. BoECK 1870 (22), 1872 (23). 



Diagnosis. Rostrum parvum, dimidium primi articuli pedunculi 



antennarum superiorura non aequans. 

 Cculi minuti rubri. 

 Antennas superiores inferioribus breviores, flagello 



pedunculo breviore. 

 Åntennee inferiores articulo quarto pedunculi perdi- 



latato, multo longiore et latiore quam quinto; 



utroque in margine inferiore setis plumosis den- 



sissimis instructo. 

 Gnathopoda secuiida dactylo duplice quasi forficem 



formante. 

 Coxae tertii paris pereipodum maxiraae. 

 Telson laciniis latis, ovatis, in margine exteriore et 



in apice spinis validis armatis. 



