212 



BULLETIN 93^ UNITED STATES NATIONAL MUSEUM. 



striate (somewhat T-sliaped in section), but not in the least clenticu- 

 hite at the basal edge. There are many accessory short lamella? 

 on the inner edge of the outer lamina of the wall. 



The basis is strong, white, poreless, wdth only very weak, obtuse 

 traces of peripheral denticles. 



Greatest carinorostral diameter 67 mm. ; lateral diameter 66 mm. ; 

 height 150 mm. (station 4253). 



Height 88 mm.; length of scutum 41 mm., breadth 18.7 mm.; 

 length of tergum 33 mm., breadth 13 mm. 



h i A' /' ( 



J 



Fig. 68. — Balanus evermanni. a, labkum. b, more magnified central part of same. 



C, mandible. d, maxilla. e, intermediate segment of CIERDS VI. /, SPINDLES OP 

 THE area INDICATED ON FIG. C. 



The labrum (fig. 68a, h) has a wide, shallow notch, with several 

 unequal teeth and numerous short hairs on each side. 



Mandible (fig. 68(?) has four acute teetii and a rounded lower 

 point, Avhich is densely hairy. There is a small tooth between the 

 third and fourth large teeth and another above the lower point. 



Maxilla (fig. 686?) has a nearly straight edge, very slightly notched 

 below the upper pair of spines. It is set wdth many crowded spines, 

 in pairs. 



Cirrus i has equal rami of about 16 segments. Cirrus ii longer, 

 with rami of 26 and 24 segments. Cirrus iii has rami of about 32 

 segments, which have a few minute, multicuspid spinules distally. 

 Cirrus iv has segments set with spike-like spinules as figured for 

 B. hmnerl, but covering a larger portion of the segments, closely and 



