60 NEW-YORK FAUNA — CRUSTACEA. 



Lernea RADIATA. 



Leech. Latrobe, Trans. Am. Phil. Soc. Vol. 5, p. 80, pi. 1. 



Lerneocera radiata. Lescecr, Jour. Acad. Nat. Sciences, Vol. 3, p. 288, pi. 11, fig. 1. 



Description. Body filiform in front ; somewhat enlarged behind. Head with five flexible 

 processes. Caudal extremity with a short central lobe, and a long filiform process behind 

 on each side. Found on the Alewife. 



GENUS PENELLA. Oken. 



Head enlarged, and furnished at the nape with two small horns ; the neck corneous. Body 

 long, wrinkled transversely, and furnished behind with small filaments disposed like the 

 barbs of feathers. Two very long filaments originate at the commencement of this pin= 

 nated portion. 



Penella plumosa. 



Description. Body susceptible of great contraction and dilatation. Head enlarged, with 

 numerous foramina at its extremity. The rudiment of a third elongated process on the nape. 

 Caudal extremity with a series of processes on each side, eighteen to twenty in number, 

 which, under the lens, appear bulbous. 



Color. All the free portion of a dark red or purple. 



Length, 2-0-3-0. 



Found on the bodies of Rhombus ferrugineus and Diodon plumosus of this report. 



(EXTRA-L1MITAL.) 



P.filosa. (Cuv. Griff. Vol. 12, p. 466. Ellis, Tr. Phil. Vol. 63, p. 15, 20. Gould, op. cit. p. 341.) 

 Seven or eight inches long. Found attached and deeply buried in the body of the Orthagoriscus 

 mola. 



