2 5 



is a spine-like tooth in the interval between the 4 th tooth and the inferior angle, and the 

 upper margin of tooth 4 is, moreover, delicately serrated in this specimen. 



Max il la (PI. XXVI, fig. 12) with the notch behind the upper pair of spines broad 

 and shallow and occupied at the bottom by 4 to 5 short spine-like hairs. The part of the 

 edge beneath the notch is somewhat oblique and furnished with 6 to 8 spines gradually increasing 

 in length, and 4 to 6 smaller ones at and round the inferior angle (PI. XXVI, fig. 12*). 



Ou ter maxillae (PI XXVI, fig. 13) have the outer lobe rounded at the extremity, 

 its whole shape being short and broad. Hairs numerous over distal half of inner surface, and also 

 forming a longitudinal group directed downwards. In none of the specimens a distinct separation 

 between outer and inner lobe could be made out : so there seems to be one lobe only, which, 

 however, at its inner and basal surface is furnished with the longer and feathered hairs that are 

 characteristic of the inner lobe in Balanus. 



Cirri. First pair. Rami not very unequal : 



in the specimen from Station 59, number of segments 9 and 12, 

 in the specimen from Station 105, number of segments 8 and 14, 

 in the specimen from Station 251, number of segments 8 to 9, and 13. 

 Segments not protuberant, those of the shorter ramus with the inner faces rounded. 

 Surface of most segments densely clothed with delicate hairs : those on the longer ramus directed 

 mostly along the long axis of the cirrus, those of the shorter ramus standing off in different 

 directions. A couple of spines are seen on the tip of the last segment of both rami. 

 Second pair. Rami nearly equal and relatively short: 



in the specimen from Station 59, number of segments 11 to 12, and 11, 

 in the specimen from Station 105, number of segments 10 and 12, 

 in the specimen from Station 251, number of segments 11 and 14. 

 Inner faces of segments rounded, without being protuberant. Delicate hairs stand off in 

 all directions and grow stronger towards the extremity; a few of them disposed on the 

 extremity of the last segment look more like spines. • 



Third pair. Rami very unequal, the cirrus, and the longer ramus especially, looking 

 much more like an ordinary cirrus of the 4 th — 6 th pairs : 



in the specimen from Station 59, number of segments 16 and 21, 

 in the specimen from Station 105, number of segments 20 and 23, 

 in the specimen from Station 251, number of segments 22 and 28. 

 The distal part of the longer ramus is very slender ; each of its segments is armed with 

 two pairs of spines on its inner face. The lower segments bear dense bushes of spine-like hairs. 

 Fourth pair. Rami hardly unequal, having in the specimens from the three Stations 

 27 and 29, 31 and 33, and 37 and 39 segments respectively. 



Fifth pair. Numbers of segments in the same specimens 29 and 31, 40 and 40, 40 

 and 43 respectively. 



Sixth pair. Number of segments 32 and 33, 41 and 41, 42 and 43 respectively. The 

 dorsal surface of the pedicels of the last three cirri, and that of the lower segments of the cirri 

 also, are, in the older specimens especially, hirsute, in consequence of the presence of short 



