24 BULLETIN 60; UNITED STATES NATIONAL MUSEUM. 



The carina is moderately arcuate, with the iiml)o projectintr a little, 

 near the apex. The roof is convex, and shows a few weak longitudinal 

 striae at the sides. The sides (parietes) are rather narrow; the intra- 

 parietes are somewhat wider. 



The upper lateral plate is larg-er than in related species, pentago- 

 nal. The carinal and two lower facets are subequal. The scutal mar- 

 gin is about twice as long as the basal, and the tergal margin is slightly 

 longer than the scutal. The umbo is not quite terminal. 



The rostrum is very long, narrowly wedge-shaped, slightly enlarged 

 at the projecting apex. 



The rostral latus is triangular, a trifle longer than wide. The ros- 

 tral margin is slightly convex, the lateral margin slightly sinuous, 

 the scutal margin somewhat concave. 



The inframedian latus is more than twice as high as wide, with 

 the umbo on the rostral margin below the middle. The scutal mar- 

 gin is slightly shorter than that against the upper latus. The carinal 

 margin is nearl}^ straight. 



The carinal lateral plate is about twice as high as wide. The umbo 

 projects slightl}^ behind the base of the carina. Below it there is a 

 nearl}' straight margin almost as long as the basal margin and about 

 one-third the length of the plate. The upper margin is oblique. The 

 dorsal margins of the two carinal latera meet below the umbones in a 

 straight suture. 



The peduncle is about one-third to one-half the length of the capit- 

 ulum. It tapers to the base and is covered with 8 rows of rather large 

 imbi icating scales, 8 to 10 scales in a row. 



Length of the capitulum 8, breadth 4, greatest diameter 1.8 mm. 

 Length of the peduncle 3 mm. 



This species, which seems to be somewhat abundant off our north- 

 eastern coast, resembles the form which Auri villi us has called S. 

 septentrionale. It differs from that, however, by the narrower base 

 of the capitulum, the greater compression, and the position of the 

 umbo of the carina, which is much nearer the apex. The inframedian 

 lateral plate is longer than in any of the related forms, and the rostrum 

 has the long and narrow shape figured by Aurivillius for S. sepien- 

 trionale and 8. obesum. The capitulum of S. pressnm is more length- 

 ened than that of 8. stroemii, chiefly by reason of the elongation of 

 the plates of the lower whorl. 



Besides the lots mentioned above, there are several others without 

 exact localities, donated by Gloucester fishermen. This barnacle is 

 often seated on the &gg capsules of rays or sharks. (Fig. 6.) 



