CALIGOIDEA. ^353 



an obtuse finger plying against a short obtuse immoveable finger. The 

 first pair of legs is similar to the same in the Caligi. The first pair of 

 natatories is rather large, and the following three pairs quite large and 

 broad, the fourth not less so than the preceding. The setse are long 

 and plumose. The mandibles are slender and straight toward the 

 apex, and when in action protrude from the very extremity of the 

 buccal trunk. The second cephalothoracic segment is somewhat alate 

 on either side ; the third and fourth not at all so. The eyes are a 

 little remote, and have between them a minute spot, much resembling 

 what is found in the Sapphirinae, which we have suspected to be 

 another eye. 



NoGAGUS VALIDUS. 



Carapax paido oblongus, ellipticus, segmento secundo ad latera pos- 

 tic£ producto, segmentis duobus sequentibus transve7*sis. Pedes secundi 

 paris crassissimd cheliformes, digito immobili brevi, tmincato, digito 

 rnobili obtuso. Abdomen 2-articulatum, segmento antico subquadrato, 

 angidis posticis prominidis ; segmento postico brevi, ti'ansverso, angulis 

 posticis truncatis. Styli caudales laid lamellati, paxdo oblongo, setis 

 tribus phimosis. 



Carapax a little oblong, oval, second segment with the sides prolonged 

 backward, third and fourth transverse, subequal, half as wide as 

 carapax. Feet of second pair very stout cheliform, immoveable 

 finger short, truncate, moveable finger obtuse. Abdomen two- 

 jointed, anterior segment subquadrate, posterior angles a little pro- 

 minent, second segment short transverse, the angles obliquely trun- 

 cate. Caudal stylets rather large, lamellar, a little oblong, setse 

 three, plumose. 



Plate 94, fig. 9 a, dorsal view of animal, enlarged ; J> to g, organs, in 

 their relative positions ; 6, anterior antennae ; c, posterior antennae ; d, 

 buccal trunk, with the maxillae ; e, first pair of feet ; /, second pair of 

 feet j g, first pair of natatories ; h, third and fourth pairs of natatories. 



From a shark, in the Pacific, northeast of New Zealand; taken 

 April 15, 1840. 



