240 



BULLETIN 93, UNITED STATES NATIONAL MUSEUM. 



The maxilla has an even edge, armed with eight large spines, below 

 the last a group of short spines. There are unusually long bristles 

 behind the spines (fig. 76d). 



The first cirrus has strongly unequal rami, the shorter ramus of 

 seven segments (longer ramus broken). 



The second cirrus has rami of 10 and 7 segments, the anterior 

 ramus longer by about 4 segment. 



The third cirrus has 12 and 9 segments, unequal as in the second. 



Fourth to sixth cirri are similar. The sixth has segments with 

 four pairs of spines, lower pair quite small. None of the cirri have 

 any " teeth " or spinules. 



The penis is decidedly longer than the last cirri, closely annnlated, 

 with a very few short hairs near the end. There is no basi-dorsal 

 point. 



FIG. 76. BALANUS SCANDENS. a, LABRUM. Z>, MANDIBLE, c, PALPUS, d, MAXILLA. 



This species stands near B. cymbiformis Darwin and B. proripiens 

 Hoek. In both of these species the carinal margin of the tergum 

 makes a right angle with the scutal margin. In B. scandens the 

 angle is acute and the valve is narrower. In B. proripiens and 

 presumably in B. cyinbiformis the rostrum is elongated and touches 

 the supporting stem, as usual in Conopea, whereas in B. scandens the 

 rostrum is not especially lengthened and is lifted high above the 

 support. B. proripiens has "teeth" on the third and fourth cirri, 

 but there are none in B. scandens. The cirri of B. cymbiformis are 

 unknown. These characters seem sufficient ground to forbid a refer- 

 ence of the Japanese species to any of the described forms. 



B. cymbiformis and B. proripiens seem to be very closely related 

 to one another. The latter has a somewhat less broad tergum and 

 the articular ridge of the scutum is better developed. B. proripiens 



