that I • "ii tlf cresl of the labrum in the specimens "i /. Cumingi 



PI l\ 

 il pi of tli«- labrum are small, rounded al their ends; the hairs on the palpi 

 e tuit .n the extremity, those on the palpi of both sides hardly touching 

 when in the natural position. The outer margin bears .1 row ol extremely 

 minute haii 



Mandibles. In one of the specimens from Station 17 the upper edge of the second 

 not pectinated. The inferior angle is onlj slightly produced in all the mandibli I 

 I; it is pectinated as figured (fig. 22 

 Maxillae PI. V. fig. 1 . I dge ver) indistinctly indentcd; it supports, be ides the thi 



.1 number ol moderately strong spines, which can hardly be divided into 

 stronger m\A more d< mes. Maxillae small, apodeme short. 



The shape of the outer maxillae (fig. 2), of the conical prominence clothed with 



bristles and coloured purple lying over the ir.fra-oesophageal ganglion between the bases of the 



tlrst pair of cirri, corresponds exactly with Darwin's description of the same parts in /. Cumingi. 



Cirri. rhe tirst cirrus has the rami unequal in length by from 2 to 5 segments, by 



about two segments in /. Cumingi, according to Darwin. I dissected in all six specimens of 



•■ and I found the following numbers of segments for the first cirrus: 21 — 17, 2c — 16, 



14. 17 13, 17-12 and 14 12. These- numbers show greater variety than is the case 



in most other Lepadids. 



(In a specimen of /. Cumingi I found a difference of 5 segments in the first pair of 

 cirri, in another of 3 segments). 



The other cirri conform in general to Darwin's description of/. Cumingi. Investigating 

 carefully the arrangement of the bristles on the segments of the sixth cirrus, I found very often 

 on the anterior surface not three pairs of spines, the lowest pair being minute, but tour pairs, 

 three of which were stronger, the fourth very delicate. A number of segments showed this 

 arrangement, others on the same cirrus the three pairs as described by Darwin for /. Cumingi. 

 (On the 6 lh cirrus of a specimen of /. Cumingi collected at Station 86 I also found tour pairs of 

 bristles on some of the segments - however, the number of segments showing this arrangement 

 was very small . 



The caudal appendages have from \- to [3 segments. The upper segments which 



in /. Cumingi "are slightly constricted round the middle, so that they resemble in a small 



degre< an hour-glass" (Darwin), in /. sibogae do not show the hour-glass shape as a rule. In 



some specimens the two last joints show a tracé of that peculiar shape. which I found distinctly 



1 in the last si\ segments of the caüdal appendages of specimens of /. Cumingi. As 



in this species the caudal append of /. sibogae are as long as or slightly longer than the 



Is of the sixth cirrus. 



li -lamellae are not very large, nor is the number of eggs in each lamella: a 



lamella contains one layer of eggs only, in that of a medium-sized specimen trom Station 61 



Il 2 |' In each lamella the eggs are kept together by an extremely delicate 



ear membrane, which surrounds each egg as a capsule. At one place the margin of 



5° 



