BIHANG TILL K. SV. VET. AKAD. HANDLINGAR. BAND. 4. N:0 8- 7 



Telson simplex. 



Corpus non valde compressum. 



The subfaraily Pterygocerinae is distinguished from the 

 Pontoporeiinge and Phoxinas by its general form as well 

 as by the abnormal structure of the dactyli of the gnathopoda. 

 Another remarkable character is presented by the peculiar 

 form of the carpus and propus of the first and second pairs 

 of the pereiopoda, which I have thought proper to denote 

 as spoonshaped, »liguliformis». Pterygocera diifers moreover 

 from the Phoxinae by the second joint of the mandibular palpus 

 being larger and longer than the third, and also by the telson 

 not being bifid, but simple and only incised. 



Gen. Pterygocera. Latreille 1825. 



Syn. Oniscus (e. p.) Slaebee 1778 (1). ') 



Haustorius. ötatius Muller 1781 (2). 



Pterygocera. Lateeille 1825 (4, 5), 1829 (7). Guékin-Meneville 



1829 (6). Milne Edwaeds 1849 (9). J. D. Dana 1852 (19). 

 Bellia. Spence Bate 1851 (11). J. D. Dana 1852 (18, 19). 

 Sulcator. Spence Bate 1854 (12), 1855 (13), 1857 (14), 1858 (15), 



1862 (16), 1863 (17). P. H. GossE 1855 (20). A. White 1857 (21). 



Å. BOECK 1870 (22), 1872 (23). 



Diagnosis. Corpus latum, vix compressum. 



Caput in rostrum parvum elongatum. 

 Oculi minuti. 

 CoxEe magnse. 



Gnathopoda non cheliformia. 



Pereiopoda prima et secunda articulis ultimis ligulas 



duplices formantibus. Pereiopoda trium pa- 



rium ultimorum articulis valde dilatatis. 



Segmentum plei tertium valde elongatum, semicy- 



lindricum, segmenta sequentia tegens. Telson 



simplex, latum et longius incisum. 



The body is broad and uncommonly little compressed. 



The cephalon is not so long as the two follovfing segments 



and produced into a flat little rostrum. The eyes are very small, 



punctiform and almost evanescent, which well agrees with 



the mode of living of the animal making the organs of sight 



almost superfluous. The superior antennae have a five-jointed 



') For the numbers see the chronological list. 



