594 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxiii. 



These are sufficient reasons to warrant a redescription of any of 

 the species on obtaining fi-esh material. Two such redescriptions 

 are liere inckided, those of Caiigus haemulonis and Lepeophtheirus 

 monacanthus, and others will follow in future papers. 



The other five species are new to science, and are particidarly 

 interesting because two of them are the types of new genera wliich 

 stand as connecting links between some of the older forms and serve 

 to emphasize their close relationship. A third species, Parapetalus 

 occidentalis, is a new representative of a genus wliich previously had 

 but a single species, and it changes the old generic diagnosis in many 

 important particulars. 



The drawings are all original and made from living material. 



CALIGUS H^MULONIS Kroyer. 



Plate XLIX. 



Caiigus haemulonis Kroyeu, 1863, p. 48, pi. iv, figs. 3a-d. — Basse tt-Smith, 1899 

 p. 448. 



Female. — Carapace orbicular, as wide as long, somewhat narrowed 

 anteriorly, considerably less than half (0.4) the entire length. 

 Frontal plates distinct, half as wide as long, with an emarginate 

 frontal border and a deep incision at the center. Lunules orbicular 

 and occupying the entire width of the plates, but not projecting 

 anteriorly. Eyes large, with prominent lenses, and situated well 

 forward. Posterior sinuses broadly U-shaped and comparatively 

 deep. Median lobe three-sevenths as wide as the carapace, squarely 

 truncated posteriorly and not projecting beyond the lateral lobes. 

 Thoracic area large, its outline almost a perfect half circle; digestive 

 glands large and horseshoe shaped, filling the entire width of the 

 median lobe. 



Free segment three-fifths as wide as the genital segment and com- 

 paratively long, showing a strong constriction anteriorly where it 

 joins the carapace. 



Genital segment oblong, half the width of the carapace, its width 

 to its length as 5 to 7. Its posterior corners are evenly roimded and 

 without lobes; its posterior margin is slightly concave. 



Abdomen narrow and elongate, one-jointed, less than half the width 

 of the genital segment, its length 2.4 times its width. 



It is widest at the center and sHghtly narrowed toward each end; 

 anal laminae small, each carrying tlu-ee large terminal setae, and a 

 short spine on the outer margin. 



Egg strings as wide as the abdomen and reacliing but little beyond 

 the tips of the setae; eggs large and only 15 or 18 in each string. 



Of the appendages the second antennie are small, with the terminal 

 claw but slightly curved; the basal joint is armed posteriorly with a 

 blunt spine half as long as the terminal claw. 



First maxilhe as long as the claw of the second antennae and bent 

 sharply at a right angle near their center. 



