CALIGOIDEA. 1369 



Carapax slightly oblong, suboval, posteriorly much excavate, the 

 angles long produced and obtuse. Following segments transverse; 

 the second with the wings not divergent, obtuse behind ; the third 

 and fourth of the breadth of the abdomen, and posterior margin of 

 each broad, rounded excavate at middle. First segment of abdo- 

 men subquadrate, narrowing posterior to middle, the posterior 

 angles truncate, and exteriorly having a minute seta, behind sub- 

 truncate and narrow ; second abdominal segment very small, trans- 

 verse, the stylets either side three times longer than the segment. 



Plate 95, fig. 3 a, dorsal view of animal, enlarged; b to g, organs in 

 their relative positions; b, anterior antennae; c, posterior antenna, 

 with suction disk on its base ; d, buccal trunk and maxilla ; e, first 

 pair of legs ; /, second pair of legs ; g, first pair of natatories ; h, last 

 two pairs of natatories. 



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

 April 15, 1840. 



Length, one-fourth of an inch. 



The carapax has the posterior angles much prolonged. The 

 winged prolongation of the following segment extends parallel with 

 the body, beyond the posterior part of the segment. The concavity 

 in the posterior margin of the third segment is much broader and 

 shallower than in the fourth. The second segment is rather longer 

 than the third, which is unusual. The posterior margin of first abdo- 

 minal segment is not concave, and not longer than half the greatest 

 breadth of the joint. 



The eyes are quite near but not in contact, and between them there 

 were two minute coloured spots. The basal part of first pair of feet 

 is about as long as the following portion. The second pair of feet is 

 very large and stout cheliform. Basal joint of first pair of natatories 

 subquadrate. 



Genus DINEMATURA. 



Corpus antice parce latius. GephalotJiorax %-articulatus, segmento 

 secundo parvo, tertio testa dorsali retrorsus valde expamo et profundi 



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