54 U.S. NATIONAL MUSEUM BULLETIN 236 



pearl oyster banks in the Gulf of Mannar (Thompson and A. Scott, 

 1903; length of ad. 9 1 mm.). A single male specimen was recorded 

 by Gurney (1927) from the Gulf of Suez; the specimen measured 1.0 

 mm; the conditions under which the specimen was obtained are not 

 given in Gurney's paper. The present record seems to suggest that 

 the species is more widely distributed in the Pacific area and apparently 

 lives on hydroids, from which the specimens apparently were removed. 

 [The number given in the tube, 756, refers to hydroids taken from the 

 ship's passage, Ifaluk Atoll, 5-5.5 fms. depth, Oct. 28th, 1953. There 

 are no further indications on the label; the specimens apparently 

 either were found in the collecting jar after removal of the hydroid or 

 were washed from the hydroid.] 



Family Bomolochidae C. B. Wilson, 1911 



Genus Bomolochus Nordmann, 1832 



Bomolochus leptoscari Yamaguti, 1953 



Figures 15, 16 

 Bomolochus leptoscari Yamaguti, 1953, p. 222, pi. 1 (figs. 9-11), pi. 2 (figs. 12-18). 



Material. — Harry Sta. 41, 1 ad. 9, 1.05 mm. 



Description. — The following is based on the only female specimen, 

 which has been partly dissected. The appendages of the left side 

 have been removed, during which operation the body was slightly 

 damaged. Appendages and the rest of the female have been mounted. 



Adult female, total length 1.05 mm., greatest diameter 0.50 mm.; 

 length of longest furcal seta 0.30 mm. 



General shape of body elongated ovate, differing from type usually 

 met with in Bomolochus by great development of cephalothorax, of 

 which, in region of cephalic somite, 2nd and 3rd thoracic somite 

 diminished very little in width (fig. 15a). Adbomen short and small; 

 separation indistinct because of small, 4th, thoracic somite. Head 

 and 1st thoracic somite completely fused, no hne of separation visible, 

 distinctly wider than long (proportion 4:3), as long as combined 

 length of thoracic somites 2 and 3. Cephalic somite (and thoracic 

 somites 2 and 3) strongly compressed dorsoventrally. Cephalic 

 somite anteriorly almost semicircular, caudally cut off squarely; 

 frontal part of head leaves basal parts of antennules free: between 

 these basal parts base of rostral plate distinctly visible as produced 

 part, well separated from cephalic somite by shallow groove (fig. 15c). 

 There is a narrow, hyaline band along the lateral parts of the cephalo- 

 thorax, first visible where the antennules become free, and continuing 

 for some distance caudally. Hyaline lamella visible in both dorsal 

 and lateral aspects. Ventral wall of cephalic somite flattened laterally 

 and in frontal part fused to antennular bases (segments 1 and 2), 



