PARANTHURA COSTANA. 



ISOPODA. 



ABERRANTIA. 



165 



ANTHURID^. 



PARANTHURA COSTANA. 



Specific character. Cylindrical ; segments of the body of nearly equal 

 size ; middle tail- piece not carinated, ovate at the extremity ; inner branch 

 of the sixth pair of tail appendages articulated and rounded at its extremity. 

 Hand of the first pair of legs produced into a minute, reflexed tubercle at its 

 extreme inner base. 



Anthura gracilis. MILNE EDWARDS, Hist, des Crust, iii. p. 136, pi. 31, 



fig. 3, but not of Montagu, ut supra. 



Idotea penicillata. Risso, Hist. N. Crust. Nice, 1816, p. 137, pi. 3, fig. 



10 (?). DESMAREST, Crust, p. 315. 



OlisTca penicillata. Risso, Hist. N. Eur. Merid. 5, p. 113. HOPE, Cat. 



Ital. Crust, p. 27 (?). 



IN the Hopeian Collection of Crustacea are preserved 

 several specimens of this species, fixed on card, to which 

 is attached a label " S. W. Coast of England on Broad 

 Sea Weed." It differs from A. gracilis in its more 

 cylindrical form, the sides of the body wanting the 

 raised lateral margins, the distinct articulation of the 



