REPORT ON THE CIRRIPEDIA. 7 



,4eveloped in the larvae of Lepas australis which I studied. Claus says that these glands 

 consist of groups of cells which have either stiU the form of a sinuous string (" eines 

 gewundenen Stranges") or which lie scattered by the side of one another; the latter is the 

 case in Lepas australis. Claus has not observed the communication of these glands with 

 the cement-duct which he figures ; at least in his figure they are at a very considerable 

 distance from one another. I have not been more fortunate ; I even faded to observe 

 the cement-duct. The different cells (PI. II. fig. 5) do not show much resemblance to 

 the cement-glands of the full-grown animal ; yet I think that Claus' sujjposition as to the 

 nature of these elements is right. As regards the place they occupy in the Cypris-larva, 

 it quite corresponds to the place they occupy in the full-grown animal, viz., in the 

 most posterior (when the animal changes its position, the most superior) part of the 

 peduncle. The Cypris-larva which furnished the drawing fig. 2 is a little older than 

 the one figured in fig. 1. In the former the cement-cells are much more separated from 

 one another than in the latter ; moreover, their nuclei are much more easily distinguish- 

 able, and many of them are not so richly furnished with fatty granules as was the case in 

 the younger condition. Very delicate and flat fibres in the later Cypris-stage are visible 

 between the cement-cells ; probably they represent the canals figured by Claus and 

 considered by him as branches of the cement-ducts. 



A pair of club-shaped bodies is situated near the ventral waU of the animal, the 

 thickest part of which is directed towards the front of the Cypris and the narrower part of 

 which can be traced as far as under the coeca of the oesophagus of this larva. These are 

 described by Claus as the ovarium (figs. 1 and 2, Od). I observed these bodies also, and 

 I think it very probable that they represent the female genital apparatus ; they are 

 especially distinct in the longitudinal section of the body shown in fig. 2. In this 

 figure the valves of the Cypris are not represented ; the clear margin round the body 

 represents the chitinous waU of the future Lepas ; the cells of the mantle serve as a 

 matrix for its formation. 



When we look now at the figure of the C}^ris-larva of Scalpellum regium which is 

 destined to develop into a complemental male, we observe great analogy as well as 

 considerable difi"erence. PI. II. fig. 3 represents a larva which has probably attached 

 itself lately, and which therefore is exactly in the same stage as the larva of Lepas 

 australis which I have just described. It is somewhat diflerent from the latter in 

 general outline, being more elongate and not so high. At the hinder extremit)' the Cypris 

 of Lepas australis is obliquely truncated and bluntly pointed, and that of the male of 

 Scalpellum almost entirely transversely truncated. Like the former it is enclosed within 

 a shell consisting of two valves of a very brittle constitution. The antennae (yin) are 

 stretched forward out of the ventral slit between the two valves; they have in aU essential 

 respects the same structure as those of the fuU-grown comjjlemental male which will be 

 described further on. At theix base in the interior of the budy of the larva a cellular 



