ALCIPPE LAMPAS. 541 



The mandibles are simpler than in any other Cirripede ; 

 they are minute ; they consist of an oblong plate, with only 

 one very strong tooth at the upper end : the face towards 

 the labrum is swollen : beneath the upper free part there 

 is a small, sub-triangular piece of thickened membrane, let 

 in and forming part of the general outer surface of the 

 mouth, and representing the large square plate found in 

 other Cirripedes. The maxillce (fig. 15) are smaller but 

 broader than the mandibles ; they have an upper tooth 

 and a smaller lower one, lying not quite in the same plane 

 with the upper one, but nearer the mandibles. The 

 apodeme (fig. 8, 15) is of remarkable length, extending 

 beneath the basal fold of the mouth : it does not arise 

 from the ridge or outer edge of the maxilla, but a little 

 on one side, from the face directed towards the mandible. 

 Between maxillae and mandibles there is a very singular 

 prominent fold of membrane (fig. 8, 15), which resembles, 

 but probably falsely, the supposed rudimentary palpus 

 attached to the mandible. Altogether the maxillae differ 

 considerably from the same part in other Cirripedes. In 

 structure they seem adapted to assume the function of man- 

 dibles ; but they do not stand directly over the oesophagus. 

 The outer maxilla (fig. 8) appear like a. minute, deeply 

 notched lower lip : each consists of a simple, oblong, 

 rounded plate, with a few small bristles at its upper end. 

 The basal fold of the mouth in front, beneath the outer 

 maxillae is distinct, and runs in a line with the basal arti- 

 culation of the first pair of cirri. In the rudimentary palpi, 

 minute and little developed outer maxillae ; and in the inner 

 maxillae, taking the function of the mandibles, the mouth 

 of Alcippe presents some resemblance with that of Ane- 

 lasma. 



Cirri. — These consist of the first, fifth, and sixth pairs : 

 the other pairs are absent, except in one monstrous spe- 

 cimen, in which there was a fourth cirrus quite like the 

 fifth. First pair, fig. 14, these are seated on each side of the 

 mouth in the usual position. They are formed of very thin 

 and flexible membrane. The pedicel, as usual, consists of 

 two segments, the upper one is short and not very distinct ; 

 but when viewed on the inner side can be seen to have 



