[McMURRICH] 



NOTES ON SOME CRUSTACEAN FORMS 



59 



greatly enlarged, almost bulbous, and the terminal one cylindrical 

 and bearing at its extremity three setae, two of which were long 

 while the third was much shorter. The second antennae and mandibles 

 were very similar in form. Each consisted of a stout basal joint 

 bearing two rami, the outer of which consisted apparently of five 

 joints, the terminal one bearing two long setae, while each of the others, 

 with the exception of the proximal one, bore a long seta at its distal 

 inner angle. No jointing was evident in the inner rami, which were 

 much shorter than the outer ones and bore two long terminal setae. 



The loss of the single specimen prevented a thorough study of 

 the structure of the larva and some of the statements made as to the 

 structure of the appendages and the arrangement of their setae may 

 require some modification when additional examples are obtained. 



4. A DENDROGASTER LARVA. 



The genus Dendrogaster was established by Knipowitsch in 

 189P for D. astericola, a cirrhipedan parasite of the starfish Echinaster 

 sarsii, inhabiting the White Sea. It has also been observed in So- 

 laster endeca from the same locality and le Roi^ has described other 



Fig. 12. Dendrogaster larva. 



species from Diplacaster sladeni taken off the cape of Good Hope, and 

 from Echinaster fallax from the Phillipines. The adult form appears 

 as a lobed and branching mass lying in the body cavity of the host, to 

 the wall of which it was probably attached by its hamate antennae. 

 One example of D. astericola was found by Knipowitsch to be packed 

 with larvae in the cypris-stage, presenting such distinctive character- 



^N. Knipowitsch. Dendrogaster astericola nov. g., et sp., eine neue Form aus 

 der Gruppe Ascothoracida. Biol. Centralbl. X, 1891. 



-O. le Roi. Dendrogaster arborescens und Dendrogaster ludwigi, zwei ento- 

 parasitischer Ascothoraciden. Zeit. f. wiss. Zool. LXXXVI, 1907. 



