8 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 122 



The appendages of G. watsoni cannot be distinguished from G. 

 ornatus, G. americanus, or G. huttoni with the result that descriptions 

 of appendages of those species apply to G. watsoni as well. 



Male. — Body form in general as in G. huttoni. Total length 11.45 

 mm (10.45-12.75 mm) based on an average of 36 specimens from all 

 4 hosts in the Indian Ocean. As in the female those specimens from 

 /. orientalis tend to be smaller (10.65 mm. average) than other hosts. 

 Dorsal surface ornamented with hairs and spinules as in G. huttoni. 



Genital segment (fig. 39) about as wide as long (2.6 x 2.6 mm). 

 Fifth leg usually extends posteriorly beyond middle of abdomen. 

 Abdomen and caudal rami as in G. huttoni. 



Appendages as in G. huttoni. 



Remarks. — Females of this species can be separated from G. 

 huttoni by the nature of the genital segment. In G. watsoni the genital 

 segment is wdder than long whereas it is longer than wdde in G. 

 huttoni. The posterior lobe is shorter in G. watsoni. In G. huttoni 

 the posterior lobe of the genital segment extends nearly as far as the 

 5th leg (see pi. 3). In G. huttoni the tip of the 5th leg extends only 

 to about the posterior three-fourths of the abdomen, whereas in 

 G. watsoni it extends to the end of the abdomen. Males of the two 

 species differ in the nature of the genital segment. In G. huttoni 

 the segment is longer than wide, whereas in G. watsoni it is nearly 

 square. 



Gloiopotes hygomianus Steenstrup and Liitken 



Figures 40-42 



Gloiopotes hygomianus Steenstrup and Liitken, 1861, p. 363. — Bassett-Smith, 

 1899, p. 458.— Stebbing, 1900, p. 670.— Wilson, 1907, p. 702.— Rao, 1951, 

 p. 254.— Shiino, 1954, p. 278; 1960, p. 533.— Yamaguti, 1963, p. 103.— 

 Hewitt, 1964, p. 95.— Lewis, 1966, p. 11. 



Specimens studied. — Two collections from the western North 

 Atlantic, 1 collection from Socorro Island (eastern Pacific), 1 collec- 

 tion from the Indian Ocean, and 4 collections in the USNM (3 Hawaii, 

 1 Puerto Rico) , all from Acanthocyhium solandri. 



Female. — Body form as in figure 40. Total length 16.7 mm (15.9- 

 17.7 mm); greatest mdth 6.2 mm (6.0-6.5 mm) based on an average 

 of 8 specimens from 4 collections. 



Shiino (1960) has provided a good description of both sexes of this 

 species except for the changes recommended below. Shiino considers 

 the first antenna as 3-segmeiited. The distal segment is heavily 

 sclerotized on its outer half and appears 3-segmented, but I could 

 find no evidence of segmentation at the midpoint of the distal segment. 

 Consequently, the 1st antenna should be considered 2-segmented in 

 all species of the genus. The process referred to as the "second 



