NO. 9 HILTON : PYCNOGONIDS 297 



Ammothella bi-unguiculata (Dohrn), 1881 



Plate 42 



J?nmothea bi-unguiculata Dohrn, Fauna and Flora Gulf Nap. Monag. 



Ill, Leipzig, 1881, 4°, pp. 158-160, Taf. 8. 

 Ammothella bi-unguiculata var. calif ornica Hall, First Ann. Rep. of La- 



guna Marine Lab., 1912, pp. 93-95. 

 Ammothella bi-unguiculata Hilton, Jour. Ent. and Zool., vol. 8, no. 3, 

 1915; vol. 12, no. 4, 1920, p. 92; vol. 31, no. 2, 1939, p. 32.— 

 Ohshima, Rep. de Bui. Sc. de la Fakultato Terkultara, Kjusi 

 Imp. Univ., vol. 2, r5, 1927, pp. 610-612, 1 pi.; Proc. Imp. 

 Ac. Ill, 1927, no. 9. 



Diagnosis: Body and legs rather smooth, 2 tarsal claws. Segmenta- 

 tion of body evident. Y.yt tubercle rather low, blunt. Long, large pro- 

 boscis. 



Description 



Body: Segmented, lateral processes moderately separated, moderate 

 development, their length about half their diameter. Body rounded in 

 front. 



Eye tubercle: Low, broad, 4 eyes well pigmented. 



Proboscis: Quite broad, smaller at the ends. Its length 21^ times its 

 diameter and % the length of the body. It ends in an obtuse rounded angle 

 as seen from above. 



Abdominal segment: Small, cylindrical, less than 1/4 ^^^ length of 

 the body, with a bluntly rounded tip. Anus in a notch at the end. 



Chelifori: Short, ^q the length of the proboscis, 3-jointed. The 1st 

 joint very short, not quite so long as the 3rd or last joint. Second joint 

 about twice the length of the 1st. Third joint a little larger than the 1st, 

 rounded. The thickness of the appendages a little less than that of the 

 palpi. 



Palpi: Nine-jointed, as long as the proboscis. First joint short and 

 thicker than the others. Second joint 4 times as long as the 3rd, 4th almost 

 as long as the 2nd, 5th and 6th about as long as the 3rd. Terminal joints 

 decrease in order. Few hairs on any joints except the last. 



Ovigers: Slightly longer and wider than the palpi. In order of 

 length, except the first, which is shorter and thicker, they are 4th, 5th, 

 6th, 3rd, 7th, 8th, 9th, and 10th. The terminal joints are spirally rolled, 

 and on the tip of the last are 3 stiff plume hairs. There is a similar hair 

 on each side of the 8th joint. 



