ART. 9 NEW PAEASITIC CRUSTACEA NIEESTKASZ AND BEANDIS 



tus — Trapesicepon is more thickset. With Leidya it differs also in 

 the absence of a frontal lamina, whereas the uropods of the latter 

 are much narrower. 



The chief differences with these genera lie in the male : The male 

 of Trapezicepon has rudimentary pleopods, whereas the male of 

 Leidya has " peculiar ventral appendages " (Leidy) and long uropods. 

 Moreover the male of Trapezicepon has a medio-ventral boss on the 

 thoracic segments and the first abdominal segment. 



APOCEPON PULCHER, new species 



Holotype.—QdX. No. 62961, U.S.N.M. One female with male on 

 Philyra pisn/ni de Haan. Tsingtau, China ; T. Urita coll. 



Description of Female. — Length (without uropods) 8 mm.; 

 breadth 514 mm. Without eyes. Body more 

 or less ovoid ; cephalon clearly bilobed. Pleural 

 bosses (ovarian bosses) very prominent and 

 wrinkled, but generally not clearly set off. 

 Coxal plates absent. Exopods of first pair of 

 pleopods very long, reaching to the second 

 thoracic segment. Remaining exopods on the 

 longer side of the animal also very long, reach- 

 ing to the third, fourth, fifth, and sixth seg- 

 ments, respectively. Those of the shorter side 

 much shorter. Endopods linguiform. At the 

 longer side, the pleural lamella of the first ab- 

 dominal segment is about one-third or one- 

 fourth of the length of the exopod ; remaining 

 pleural lamellae somewhat longer than the first. 

 Uropods very broad in the middle, and with 

 the extremity turned outward. 



Description of Male. — Length 31/2 mm. Slender, and somewhat 

 tapering caudally. Eyes absent. Pleotelson V-shaped, and as long 

 as the abdominal segments IV and V together. 



Figure 20. — Apocepon 

 pulcher, male, 

 doesal view 



LITERATURE 



Caulleey, M. : Reclierches sur les Liriopsidae. Mitth. Zoolog., Neapel, vol. 18, 

 1906-1908, pp. 583-643. 



V. Kampen, p. N. and H. Boschma : Die Rhizocephalen der Siboga-Expedition. 

 Monographie 31bis Siboga-Expeditie, Leiden, 1925, pp. 1-61. 



NiERSTEASz, H. F. and Z. S. Beender a Beandis : Die Isopoden der Siboga-Expe- 

 dition, II Ispoda Genuina I. Epicaridea. Monographie 32.6, Siboga- 

 Expeditie. 



Richardson, H. : A Monograph on the Isopods of North-America. Bull. 54 

 U. S. Nat. Mus., 1905, pp. 1-727. 



Smith, G. : Rhizocephala, Fauna u. Flora d. Golfes v. Neapel, Monographie 29, 

 1906, pp. 1-123. 



U. S. GOVERNMENT PRINTING OFFICE: 1930 



