THE SESSILE BARNACLES. 



117 



The description, figs. 29, 30a, ~b, and pi. 25, figs. 2, 3, are from south 

 coast of England (Exmouth) specimens, and represent the typical 

 form of the species. 



Several specimens taken in 34 fathoms, 10 miles east of the north 

 end of Patros Island, Brazil, 1 presented to the United States National 



FIG. 30. TERGA OF BALAOTS SPONGICOLA. a, 6, EXMOTJTH. c, OFF PATROS ISLAND, 

 BRAZIL; ALL DRAWN TO SAME SCALE, d, BALANTJS CALEDUS. 



Museum by Dr. R. Rathbun, taken by the steamer Norseman, Cat. 

 No. 14144 U.S.N.M., grew with B. ampJiitrite niveus. Externally 

 they do not differ from pale examples of the English B. spongicola, 

 but the scuta are somewhat narrower, and the terga (fig. 30c) 

 have the basal margin a little more hol- 

 lowed out on both sides of the spur, which 

 is noticeably narrower. The basal diameter 

 is 13 mm. in the largest example -(pi. 25, 

 figs. 4-4c). 



The dried bodies of these specimens were 

 much broken, but I note that the mandible 

 is very similar to that of B. calidus. It 

 has the fourth tooth conic though short, the 

 fifth very small, and largely united with the 

 ob tuse lower point. The maxilla has an even 

 edge, and nine spines between the upper and 

 lower large pairs. The third cirrus has minute 

 bifid and trifi d spines near the distal borders of 

 the lower five segments, which alone were preserved. The fourth cirrus 



1 Unable to locate Patros Island, I applied to Dr. R. Rathbun, who replied as follows: "We exhausted 

 every resource at the Museum in an effort to locate Patros Island, and then I appealed to the Hydrographic 

 Office of the Navy, but they have not met with better success. The facts are these: When I was in Brazil 

 between 1875 and 1878, with headquarters at Rio de Janeiro, I came in contact with the officers of the British 

 steamer Norseman, which was the repair steamer for the cable along the Brazilian coast. Small specimens 

 used to be brought up attached to the cable or loose in the apparatus they employed. The doctor of the 

 steamer always brought these to me, and I labeled them in accordance with his information. I do not 

 recall anything from the steamer Norseman that did not come from at least moderate depths of water on 

 the coastal platform, and where the name of an island is given, I imagine it simply indicates the approxi- 

 mate locality. I was not the collector of any of the specimens from the Norseman, and my name was 

 put on the labels only to show that they came through me." 



4729 Bull. 9316 9 



ANTERIOR-DISTAL PART OF THE 

 12TH SEGMENT OF CIRRUS IV. 



