GEOGRAPHICAL RANGE. 159 



dividing into new and smaller segments,— in one instance ten 

 in number, — which at the next exuviation would, no donbt, 

 be invested with an external membrane, and be freely 

 exposed. In another instance, the pedicel of a posterior 

 cirrus had been cut off and subsequently closed ; in this 

 instance, a whole, immature, miniature cirrus, w r ith the two 

 rami, each having fifteen minute segments, was thus en- 

 closed in what had been the single lower segment of the 

 pedicel. I have seen several specimens of Balanus bala- 

 noides, as described under that species, with several of the 

 cirri and the penis truncated ; but I believe this was owing 

 to monstrosity, which seemed particularly to affect the male 

 organs of generation ; for no reparation seemed to be in 

 progress. In a specimen of Coronula, however, the penis 

 appeared to have been really cut off by accident ; it had 

 been closed, by a scab, with concentric lines, like the 

 articular rings on the penis itself; and within the case thus 

 formed, the corium had healed, and had become pointed, 

 but inverted ; I presume that the point would, after another 

 exuviation, have been everted, and its length thus increased. 



Geograpldcal Range and Habits. 



With respect to range, the results arrived at have no 

 particular interest, for the species are not sufficiently nume- 

 rous ; and, what is still more adverse, the genera, with 

 unimportant exceptions, range over the world; so that 

 there is no scale of differences, and it cannot be said that 

 these two regions differ in their genera, and these two only 

 in their species. In all the following remarks, I have 

 trusted exclusively to my own specific identification ; and 

 have rejected all assigned localities which appeared from any 

 cause to be doubtful. Sessile cirripedes are found in every 

 sea, from lat. 74° 18' north to Cape Horn. The area 

 included between the north point of the Philippine Archi- 

 pelago and the south point of Australia, extending on the 

 right hand to New Zealand, and on the left to Sumatra, — 

 an area, which, though including two distinct Cirripedial 

 regions, is small compared with the surface of the globe, 



