I5S RICHARDSON 



by more than half the width of the head ; at their apex by more than a 

 third. The first pair of antennae have the basal joints very much 

 dilated ; they extend nearly to the posterior margin of the head. The 

 second pair of antennae reach the posterior margin of the third thoracic 

 segment . 



The mandibles are very prominent, the pair much overlapping, with 

 the apical part forming a single cone. 



First five thoracic segments sub-equal, the last two being somewhat 

 shorter. The first two epimera are not longer than the segments 

 and are rounded posteriorly ; the last four are acute, and produced 

 beyond the segments. The abdominal segments are tuberculate on 

 their posterior margins, with a median longitudinal 

 excavation, ornamented in the median line with 

 low tubercles. The terminal segment is acute at 

 the apex, triangulate, with a median longitudinal 

 excavation. At the base of the segment are four 

 tubercles in a transverse line, the two centre ones 

 being largest. A double tubercle is situated lat- 

 erally on either side. The uropoda have both 

 Fig. 2. Abdomen branches equal in length and not longer than the 

 of Corallana acuh- terminal segment. The inner branch is broad, 

 ' and posteriorly acute ; the outer branch is narrow, 



and acutely produced. Both branches and also the terminal segment 

 of the body are fringed with long hairs. 



The male of this species resembles the male of Corallana antillen- 

 sis Hansen, especially in a comparison of the abdomens. They are, 

 however, specifically distinct, as more careful examination has shown. 



Family BOPYRID^. 

 BOPYRUS ALPHEI sp. nov. 



A specimen of Bopynis parasitic on Alphens heterochcclis Say, 

 collected on mangroves on the Rio Parahyba do Norte is probabl}^ iden- 

 tical with the Bopyrus mentioned by Fritz Miiller' as being found on a 

 species of Alphens on the coast of Brazil. Fritz IMiiller's species has 

 been recorded as Bopyrus alphei although no description or figure of 

 it has ever been published. 



The body of the female is broadly oval, its greatest width being 

 equal to its length, broadened anteriorly and narrowed posteriorly. 



' Jenaische Zeitschrift, VI, p. 68,1871. 



