28 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 121 



Gangliopus pyriformis Gerstaecker, 1854 



Figures 139-146 



Gangliopus pyriformis Gerstaecker, 1854, p. 192. — Wilson, 1907, p. 350. — Monod 



and Dollfus, 1938, p. 204. 

 Nogagus angustulus Gerstaecker, 1854, p. 193. 

 Gangliopus tetrapturi Yamaguti and Yamasu, 1960, p. 142. 



Specimens studied. — Three collections from Prionace glauca in 

 the Indian Ocean (0°58'N, 55°00'E; 0°14'N, 55°00'E; 6°37'S, 55°00'E). 

 One collection from the same host in the North Atlantic (39°32'N, 

 28°02'W). 



Female. — Body form as in figure 139. Total length 9.1 mm 

 (based on an average of 3 specimens). Greatest width 4.9 mm 

 (measured at widest part of the cephalon). Dorsal thoracic plates 

 on segments 2-4. Plates of segment 2 small and not extending to tip 

 of plates of segment 3. Plates of segments 3 and 4 each with a deep 

 median incision. Genital segment nearly square. Abdomen 1- 

 segmented and joining genital segment at posterior border. Abdomen 

 with a small dorsal plate. Caudal rami small and held at lateral 

 angles of abdomen. 



Oral area of usual pandarid type. No adhesion pad with first 

 antenna. Adhesion pad of second antenna small and inconspicuous. 

 Adhesion pad of maxilliped large and L-shaped (fig. 140). 



Monod and Dollfus (1938) have given a detailed description of 

 female appendages. 



Legs 1-4 biramose with spine and setal formula as follows: 



Leg 5 (fig. 141) consisting of a single finger-like spine with 2 short 

 setae. Fifth leg near junction of abdomen and genital segment. 



Egg strings long and each composed of a single strand. 



Color in life pale yellow and without pigment. 



Male.— Body form as in figure 142. Total length 7.4 mm (based 

 on 1 specimen). Greatest width 3.5 mm (measured at widest part of 

 cephalon). Thoracic segments without dorsal plates except for a 

 winglike expansion on the posterolateral corners of segment 2. 

 These extend nearly to end of segment 3. Genital segment (fig. 

 143) nearly square, 1.75 mm long by 1.85 mm wide. Genital segment 

 with each posterior corner produced into broad lobe. Abdomen 

 2-segmented. Caudal rami prominent, with 4 long plumose setae 

 and 2 smaller ones at each distal corner. 



Oral area as in female except a small adhesion pad associated 

 with first antenna. Adhesion pad of maxilliped small and incon- 



