IÓ2 



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 vd cirrus, both rami with a few (2—3) very small teeth on the middle segments. 



Section Solido-Balanus 



B. ciliatus : 3" 1 cirrus, both rami with rows of recurved teeth along the anterior face of the 

 segments; the last segment of the longer ramüs, and the last three segments of the 

 shorter excepted. 

 4 ,h cirrus, anterior ramus, 2 nd to 6 th segment with small recurved teeth. 



B. compressus : y d 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 nd cirrus, both rami, nearly all the segments armed near extremity with 



transverse rows of small triangular teeth. 

 3 rd cirrus, both rami, as on second cirrus, but teeth slightly stronger. 

 4 th 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-Balaiius 



B. arcuatus : 3 ld cirrus, both rami, row of recurved teeth along nearly all the segments. 



4 th cirrus, with a few teeth along the anterior margin of some of the segments of the 

 shorter ramus only. 

 B. tcrebratus : 3 rd cirrus, longer ramus has a few small teeth along the lower segments. 



4 th cirrus, shorter ramus has a row of recurved teeth along anterior face of the lower 

 segments. 

 B. qaadrivittatus : 3 rd cirrus, anterior ramus, on the segments 2 — 7, near the extremity, a 

 row of extremely small teeth is disposed. 

 4 th cirrus, second segment of pedicel, and lower segments of anterior ramus with a row 

 of sharp recurved teeth. 

 B. quinquevittatus \ as qnadrivittatus, but spines on 3 rd cirrus still smaller and the teeth along 



2 nd se g- men t of pedicel of 4* cirrus forming a much longer row. 

 B. hystrix : 3 rd cirrus, both rami, numerous rows of recurved teeth all over the surface, the 

 strongest along the anterior margin of nearly all the segments. 

 4 lh cirrus, both rami, teeth along the anterior face and on the surface of numerous 



segments. 

 5 th cirrus, both rami, teeth along anterior face and on surface of numerous segments. 



Section Patella-Balanus 



B. cornutus: 3 rd 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 



