322 
Forma nivea Gruvel. 
Off Jolo; ab. 20 fathoms, Lithothamnion, 17/111 14. Two specimens on 
a half corroded, dead gastropode shell. 
I was at first inclined to refer the present specimens to Bala- 
nus Kriigeri Pilsbry owing to the feeble sculpturation of the internal 
side of the scuta; but the crenulation of the edge of the radii 
agrees with Balanus amaryllis . The external sculpture of the oper- 
cular plates is very delicate and the spur fasciole shallow, although 
distinet. The labrum has three denticles at each side of the notch, 
and the mandible has the typical shape of Balanus amaryllis, thus 
distinetly differing from Balanus Kriigeri. Moreover the cirri cor- 
»I 
respond with Balanus amaryllis in the want of anterior smaller 
spines in cirrus III and IV. On the other hånd, the posterior sides 
of the basal segments in the rami of cirrus III and IV are finely 
pectinate, and the pectination may also be traced in cirrus V. The 
short and rapidly tapering penis has a strongly developed basi- 
dorsal protuberance. 
Subgenus Austrobalanus Pilsbry. 
Balanus vestitus Darwin. 
? Masked Island, Carnley Harbour, Auckland Island; below stones at low 
tide 3 / X11 14. The opercular plates being absent the identific- 
ation is not quite sure here. 
Queen Charlotte Sound, N. Z.; 3—10 fathoms, hard bottom intermingled 
with softer spots, 19—20/1 15. A group of three specimens to- 
gether with Calantica villosa. 
Darwin (1853) gives the details of this interesting species al¬ 
though without drawings of the body details. I therefore here give 
the outlines of the mandible and maxilla (Fig. 61). In the invest- 
igated specimen the labrum has only one very small denticle at 
each side of the deep notch. 
Among the cirri of the specimen dissected cirrus I has a 
shorter ramus of only one third the length of the longer ramus 
which latter is rather siender; the numbers of segments are 11 and 
25. The rami of cirrus II are of equal length with 10 and 11 
segments. In cirrus III the rami are subequal with 23 and 26 
segments; only the basal segments are broader and bullate; the 
