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along the anterior face of several segments; similar but smaller teeth, are also 
observed on a few segments of the shorter ramus. 
B. minutus: 3° cirrus, both rami with a few (2—3) very small teeth on the middle segments. 
Section Sofzdo-Balanus 
B. ciliatus: 3° cirrus, both rami with rews of recurved teeth along the anterior face of the 
segments; the last segment of the longer ramus, and the last three segments of the 
shorter excepted. 
4‘h cirrus, anterior ramus, 24 to 6t* segment with small recurved teeth. 
B. compressus: 3% cirrus, both rami, numerous segments near anterior face, and upper extremity 
armed with groups of triangular and straight teeth. 
Section Membrano-Balanus 
B. longirostrum: 2.4 cirrus, both rami, nearly all the segments armed near extremity with 
transverse rows of small triangular teeth. 
3" cirrus, both rami, as on second cirrus, but teeth slightly stronger. 
4‘ cirrus, both rami with well-developed transverse rows along upper margin of most 
segments, and also of the two segments of the pedicel. 
Section Armato-Lalanus 
B. arcuatus: 3%4 cirrus, both rami, row of recurved teeth along nearly all the segments. 
4‘h cirrus, with a few teeth along the anterior margin of some of the segments of the 
shorter ramus only. 
B. terebratus: 3° cirrus, longer ramus has a few small teeth along the lower segments. 
4th cirrus, shorter ramus has a row of recurved teeth along anterior face of the lower 
segments. 
B. quadrivittatus: 3' cirrus, anterior ramus, on the segments 2—7, near the extremity, a 
row of extremely small teeth is disposed. | 
4'h cirrus, second segment of pedicel, and lower segments of anterior ramus with a row 
of sharp recurved teeth. 
B. quinguevittatus: as qguadrivittatus, but spines on 3 cirrus still smaller and the teeth along 
2nd seement of pedicel_of 4 cirrus forming a much longer row. 
B. hystrix: 34 cirrus, both rami, numerous rows of recurved teeth all over the surface, the 
strongest along the anterior margin of nearly all the segments. 
4" cirrus, both rami, teeth along the anterior face and on the surface of numerous 
segments. ; 
5‘ cirrus, both rami, teeth along anterior face and on surface of numerous segments. 
Section Patella-Balanus 
L. cornutus: 3° cirrus, both rami have a row of small thorns or teeth along inner face of 
all the segments, with the exception of the last. 
34 
