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genus, for the sake of convenience names were also given to the two last mentioned forms. The 

 number of known species of the genus Alepas not being very large and the species more or 

 less recognisable from their outward shape, no confusion will arise I hope from my naming these 

 two forms, deviating in so doing from what I consider a very good rule in general. 



Genus Microlepas n. gen. 



Capitulum without valves, with rather large and prominent aperture. Mandibles and 

 maxillae foliaceous without teeth or stronger spines. Cirri of the first pair one-jointed without 

 rami, those of the 2"^^ — 6"' pair with uniarticulate rami of very unequal size. 



This cirripede resembles at first sight a species of Alepas \ it cannot be considered as 

 belonging to that genus, however, owing to the structure of its mouth-parts and cirri. Only one 

 species of the genus is known ; to give a more detailed description of the genus is useless and 

 even dangerous, as it is quite impossible to decide what characters have generic and what 

 specific value only. The only specimen of the species of this genus which is at my disposal 

 was found by Prof. Max Weber attached to one of the spines of Diadenia saxatile (Linn.) at 

 Station 53. I propose to call the species: 



I. Alici'olepas diademae n. gen., n. spec. PI. X, Fig. 8 — 16. 



Capitulum blending insensibly into the short peduncle, aperture oval, large, situated at 

 some distance from the slightly produced summit. Peduncle indistinctly wrinkled. 



Capitulum elongate-oval, moderately flattened (PI. X, fig. 8); its summit bluntly pointed, 

 forming a small conical excrescence in front of the orifice. The membrane composino- the 

 capitulum is thin, flexible, smooth on the left, longitudinally wrinkled on the right side. Orifice 

 large, broadly oval with darker, brownish coloured margin. Peduncle short, blending insensibly 

 into, but a little narrower than the capitulum ; surface with an indication of transverse wrinkles. 



The colour of the capitulum is light greyish-brown, but it has been in spirit for several 

 years. The size is, including the peduncle, 5,6 mm. 



The little animal's body was hanging out of the orifice of the capitulum, it was distorted 

 and in a somewhat deteriorated condition. A piece of the sack or mantle was loosened from 

 the inner side of the capitulum and also forced out of the orifice and a cluster of e^crs was 

 attached to this piece of mantle. The body was to some extent covered by these parts, so 

 that I only succeeded in making out its structure by loosening it from the capitulum. 



I found the mouth not very prominent and placed at a little distance from the first 

 pair of cirri. The prosoma was well-developed, its muscles rather strong, the j^art of the body 

 representing the thorax small, rather rudimentary. 



Of the parts of the mouth, I found the 1 a b r u m not distinctly bullate or swollen with 

 a straight crest without distinct teeth and with small triangular palp i. The mandibles and the 

 maxillae were relatively large, and extended bejond the labrum and the outer maxillae; they 

 were of a very peculiar shape. 



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