578 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxviii. 



CALIGUS CURTUS Muller. 

 Plate X, tigy. 8, 24, 2S in the text. 



Callgus curtnxMviAjKK, 1785, p. loO, pi. xxi, lit::. 1. — .Smith, 1874, p. 575. — Rath- 



HUN, 1884, p. 486. 

 Caligua muller i Leacu, ISUi, p. 405, ]>]. w, tigs. 1-8. — D.\na, 1854, p. 1352. 

 Cdligit!-: hicKxpiddliix 'NomyuxNN, 1832, II, p. 17. 

 Va/igtis (i)ut'i-inuiii^ Pii'KERixci and Dana, 1838, p. 65, pl.s. iii, iv, v.^Dana, 



1854, pi. xtiii. 

 OdigiiK dktplKUuif^ IJaikd, 1850, j). 260, \A. xwii, tig. 1. 

 <^tligi(s eJcgavK van Beneden, 1851, ]>. 01, a male. 



F( iiKth'. — C4ir;i|):ice soniowhtit 1oiio(M' than the rest of tlie bod3",obo- 

 viite. Frontal phite.s distinct, the unterior niaroin well rounded and 

 incised at the center. Liinules larue and circidar, not very widely 

 separated and not projectino-. Posterior sinuses narrow, shallow, and 

 with nearly parallel sides; the median lobe less than half the entire 

 width, projecting- for two-thirds of its length be3'ond the lateral lobes; 

 the latt(u- l)road and well rounded (tig. 118). 



Thoracic area (juadrilateral, comprising about one-third of the cara- 

 pace; its anterior groove nearly straight. Eyes small and situated far 

 forward. Free segment short and very narrow, not more than half 

 the width of the genital segment, and spindle-shaped. Genital seg- 

 ment o])long, half as long as the carapace, with parallel sides and well- 

 rounded corners. There are no lolxvs on. this segment and the fifth 

 legs are not visible dorsally. Abdomen short, half as long" as the 

 genital segment, often slightly swollen at the center. Anal lamina> 

 rather small with very long setw; o.'g^^ strings wide and a])Out as long- 

 as the entire l)ody. 



Anterior anteniue large, the basal joint much longer and wider than 

 the terminal and both joints plentifully supplied with seta^ and spines. 

 These antenna^ stand out very prominently from the carapace. Second 

 antenna' stout, with a long accessory spine on the inner border of the 

 terminal claw, near its base. 



First maxilhe of good size and situated close to the edge of the 

 carapace, the terminal portion strongly curved and the base consider- 

 ably swollen. Second maxilhe l^roadl}' triangular with curved sides, 

 a))ruptly narrowed near the tip into an acuminate spine. This repre- 

 sents the endopod of the appendage, while upon the ventral surface of 

 the base of the triangle is the rudimentary exopod, consisting of a long, 

 slender spine and three or four small seta\ This exopod is articulated 

 with the base of the endopod and is capable of considerable motion. 



The mandibles are curved inward and dentated along the inner edge, 

 the lumd^er of teeth being about fourteen. 



First maxillipeds very slender and weak, the terminal joint much 

 longer and narrower than the basal, with a short spine on its inner 

 margin near the distal end. The two claws at the tip of these append- 



