BARNACLES FROM THE NORTH PACIFIC — HENRY 



233 



below the upper large pair of spines. There are seven pairs of 

 spines below the upper pair. The last three are on a slight promi- 

 nence. The inferior border and the surface near the origin of the 

 spines are covered with fine hairs. Highly promi]ient tubular olfac- 

 tory organs are situated on the external surface of the outer maxillae. 



Figure 5. — Scalpellum cohimbianum from Point No Point, Puget Sound : a, Immature, side 

 view, X 58 ; 6j labrum, X 39 ; c, caudal appendage, X 39 ; d, maxilla, X 80 ; e, sixth 

 segment of cirrus VI, X 80 ; ^, mandible, X 80. 



The anterior ramus of cirrus I is only slightly shorter than the 

 posterior ramus; both rami have seven segments. The first cirrus 

 is set a little apart from the other cirri. The second cirrus is longer 

 than the first and a little shorter than the third. The rami of both 

 the second and third cirri are unequal in length. The posterior cirri 

 are slightly curled. The sixth cirrus (fig. 5, e) has four pairs of 



