74 



found to exist, and it therefore may be allowed to include the present family 

 in the same great division. Moreower in habits these forms agree with the 

 other Notodelphyoida in so far that they are parasites of the same group^of 

 animals, viz., the Tunicata. The want of any true masticatory appendages 

 would seem to prove, that these Copepoda do not feed on any firm particles, 

 but only on some nourishing fluids licked up from their hosts. In ^o far they 

 present an evident agreement with the poecilostomoiis Cyclopoida, from which 

 they indeed may be assumed to have been originally derived by a close adaption 

 to changed conditions of life, just as the other Notodelphyoida in all probabi- 

 lity by a similar adaption have taken their origin form gnathostomous Cyclopoida. 

 3 genera referable to the present family will be treated of below. Another 

 genus, Enteropsis, has been established by Aurivillius, and moreover several 

 of the peculiar forms recorded by Hesse, as found in compound Ascidians, may 

 in all probability be included in the same family. 



Gen. 15. Cryptopodus, Hesse, 1865. 



Syn: Aplostoma, Canu. 



Generic Characters. Body of female oblong, more or less curved ven- 

 trally, with the anterior division well marked off from the posterior and 

 terminating behind on each side in a short rounded lobe (the transformed 5th 

 pair of legs), the last 2 trunkal segments coalesced. Tail very small and 

 imperfectly segmented. Posterior antennae smaller than the anterior ones, distal 

 joint sublinear and minutely denticulate outside. Oral aperture forming a 

 transverse fissure limited in front by a slightly prominent bell-shaped anterior lip. 

 Maxillae only present as a very trifling rudiment on each side of the oral 

 aperture. Maxillipeds comparatively small, biarticulate, and terminating in a 

 minute hook. The 4 anterior pairs of legs very imperfectly developed, basal 

 part not distinctly defined, rami confluent at the base, the outer one forming 

 a simple rounded lobe, the inner knife-shaped, with a few short denticles inside. 

 Last pair of legs having the appearance of 2 simple conical lobes projecting 

 on each side somewhat dorsally from the last trunkal segment. Ovisacs large, 

 cylindrical in form. 



Remarks. This genus was established in the year 1865 by Hesse, but 

 very imperfectly characterised, and on that account it was not recognised by 

 subsequent authors. I think however I am right in identifying the genus 

 Aplostotna of Canu with Hesse's genus. In any case the generic name pro- 

 posed by Canu cannot be supported, as it has been long ago preoccupied. 



