84 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 60 



Remarks. — From the above key it will be seen that Hesse is respon- 

 sible for seven of the species in this genus. But the same is true here, 

 as in all the work done by Hesse, the discrepancies and contradic- 

 tions in his text and drawings are so numerous and so vital that his 

 species can not be accepted until they have been described and figured 

 anew. Take, for instance, his species crenelabri. Figure 10, plate 19, 

 shows a dorsal view of an adult female, in which the first antennae 

 have 14 joints, all the same length, and the second swimming legs 

 are biramose, the exopod two-jointed, the endopod one-jointed, both 

 well supplied with setae. Figure 11 is a dorsal view of the head and 

 first two thorax segments, enlarged, in which the first antennae have 

 14 joints, but the first or basal joint is as long as all the others taken 

 together; the second swimming legs are uniramose, one-jointed, and 

 destitute of setae. Figure 12 is a ventral view of the head and first 

 two thorax segments, in which the first antennae have 24 joints, all 

 the same size, and the second swimming legs are uniramose, two 

 jointed, and well armed with setae. The creature presented as a male 

 of this species in figure 1 of the same plate certainly does not belong 

 to the genus Hatschekia^ nor indeed to any other known copepod 

 genus. 



Clavella hramae. — P. J. van Beneden in his Les Poissons des Cotes 

 de Belgique, leurs Parasites et leurs Commensaux (Bruxelles, 1870) 

 mentioned on page 43 Cla-vella hramiae.^ new species, as a parasite on 

 the gills of Cantharus hrmna. He did not give a description or figure 

 of the species, and no other investigator has either seen or mentioned 

 it, so that it becomes a nojnen nudum. 



Clavella clavata. — Miiller in his Zoologiae Danicae Prodromus, 

 published in 1776, gave on page 227 a three-line description of a para- 

 site which he called Lemiaea clavota. Kr0yer in Naturhistorisk Tids- 

 skrift (vol. 1, 1837, p. 195) said in a footnote that he was unable to 

 decided whether M tiller's species belonged in the genus Clavella^ be- 

 cause he had never seen it and Miiller's description was unsatisfactory. 

 On the next page, however, he placed it under Clavella^ but with a 

 question mark. These are all the data at present available and they 

 are not sufficient to locate the species definitely. 



Clavella ohesa. — Richiardi published in 1880 what he termed a 

 systematic catalogue of the Crustacea living upon aquatic animals, 

 which was included in the Report of the International Fisheries 

 Exposition held in Berlin during that year. In this catalogue he gave 

 the names of many parasitic copepods, which he claimed as new spe- 

 cies, but which have never been described or figured. Among them 

 was Clavella ol)c.-<a^ which thus becomes a nomen nudum. 



Cycnus? hudegasse. — Kr0yer in his Bidrag til Kundskab om Snylte- 

 krebsene, 1863. page 65. described and figured (pi. 12, fig. 3) a cope- 



