366 



BULLETIN 15 8, UNITED STATES NATIONAL MUSEUM 



and transversely elongate. Along the frontal and lateral margins 

 of the head and the sides of the thoracic segments are bright red 

 dots, sometimes arranged in rows parallel with the margins, some- 

 times scattered about irregularly. Similar dots run down the median 

 line of the genital segment and abdomen, and there is a single 

 transverse row across the anal segment. Along each side of the 

 digestive canal in the metasome is a yellow longitudinal band, which 

 becomes red in the genital segment and abdomen. The pigment of 

 the retina and optic nerve is dark bluish green, almost black; the 



appendages are bluish gray like the 

 body; the ovisacs are deep blue 

 (Rathbun). 



Female. — Head two-fifths wider 

 than long, projecting slightly at the 

 posterior corners; second segment 

 wider than the first, with rounded 

 corners; third segment abruptly 

 narrowed to three-fourths the width 

 of the second segment ; fifth segment 

 half the width of the fourth. Caudal 

 rami obovate, inclined toward the 

 midline, with a minute aculeate spine 

 on the inner margin near the tip. 

 Fourth segment of second antenna 

 twice as long as third, the two to- 

 gether the same length as the second 

 segment. Fourth endopod with two unequal apical spines. Total 

 length, 1.75-2.15 mm. 



Male. — Total length of body to greatest width as 5:3; corneal 

 lenses just visible in dorsal view; second metasome segment nar- 

 rower than first ; third segment not abruptly narrowed. End segment 

 of second endopod with a large lanceolate flanged spine on the outer 

 margin, three toothed apical spines, a curved claw at the inner distal 

 corner, three inner setae, and three short spines around the apex. 

 Total length, 1.35-2.25 mm. 



Remarks. — This species is also a straggler from the Tropics in 

 the Gulf Stream and was taken in company with the same Salpa 

 as the preceding species. 



SAPPHIRINA PYROSOMATIS Giesbrecht 



Figure 223 



Sapphirina pyrosomatis Giesbeecht, Fauna und Flora des Golfes von Neapel, 

 vol. 19, p. G19, pis. 4, 52-54, 1892. 



Occurrence. — Both sexes were taken with the two preceding species 

 in a surface tow at Station 1107, Fish Hawk^ south of Nantucket ; a 



Figure 222. — Sapphirina auronitens: 

 a. Female, dorsal ; 6, female, second 

 antenna ; c, female, fourth leg 



