384 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 39. 



Eucanthus halistse. — Clans established the new genus Eucanthus in 

 1864; in speaking of its distinguishing characters he says: 



Unterscheidet sie sich von Bomolochus durch den Besitz von zwei kraftigen Kopf- 

 haken, durch eine abweichende Form und Lage des untern Kieferfusses .... Nach 

 den beide ausserhalb der untern Antennen befestigten Ilaken mag die Gattung Eucan- 

 thus .... heissen (p. 378). 



He thus recognizes that the presence of these prehensile hooks is 

 an important generic character, but he makes no attempt to explain 

 them. In fact the above quotation is all that is said of them. 



Unfortunately the name Eucanthus had been used in 1848 by 

 Woodward for a genus of Coleoptera, and so can not stand for this 

 genus of copepods. Brian, however, described m 190G a new sub- 

 genus which he called Anchistrotos, and which seems to be identical 

 with Eucanthus, and hence his name can be substituted for the one 

 given by Claus. 



Bomolochus gracilis. — In the followmg year (1865) Heller published 

 in his account of the Crustacea obtained during the Reise der 

 Novara descriptions of Ergasilus peregrinus, Bomolochus megaceros, 

 and a form which he called Bomolochus gracilis, all new species. 

 In speaking of B. megaceros, which is a genuine Bomolochus species, 

 he calls the large maxillipcds ''Diese grossen seitlichen Hornhaken." 

 After noting that they were found by Kroyer (1863) m most of the 

 Bomolochus species which he investigated and were designated — 



Als das vergrosserte zweite Fusspaar (zweites Kaufusspaar der Autoren) — 



Heller goes on to say that he can not agree with this desigation. 

 He adds by way of explanation : 



Man findet niimlich auch hier die gewohblichen zwei Kaufusspaare (das erste 

 imd zweite Fusspaar Kroyers) ganz in der Niihe des Mundes eingefiigt. Sie sind 

 zwar klein und zart, eber bei starker Vergrosserung ganz dentlich als solche wahr- 

 zunehmeu. Die seitlichen Hornhaken sind dieselben Gebilde, welche wdi' bei den 

 Geschlechten Caligus und Lepeophthcirus fast constant nn der Aussenseite der 

 hintem Antennen bemerken, sie sind hier nur auf eine ausserordentliche Weise 

 entwickelt und bilden jedent'alls ein ganz kriiftiges Werkzeug, mit welchen das 

 Schmarotzcrthier sich ah seinen Wirthe festsetzen kann (p. 155). 



Then in speakmg of Bomolochus gracilis he says: 



Der seitliche Hornhaken is hier ^-iel weniger entwickelt und mehr nach vorne 

 hingeriickt, so dass er wle ein Anhang der vor deren Antennen erscheint (p. 153). 



Heller made several mistakes which, when clearly understood, go 

 far to explain these apparently conflicting statements. In the first 

 place he fhids what he calls the mandibles of B. megaceros inside of 

 the mouth instead of on the ventral surface of the head, where all 

 other investigators have located them and where he himself locates 

 them in B. gracilis. This leaves him free to designate the true 

 mandibles as first maxillipcds and the second maxillas as the second 

 pair, and under these conditions the only thing he could do with the 



