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46 



STALK-EYED CRUSTACEA. 



In the genus Paraiomis^ as typified by P. granulosa and illustrated also 

 by P. diomedecc, the ambulatory appendages are considerably longer tban the 

 chelipedsj and much longer than the carapace is broad ; when flexed beneath 

 the thorax, the tips of the dactyli extend over the ischia even to the basal 

 se^-racnts ; although the legs are folded beneath the body when at rest, 

 there are none of those special modifications of strnctwe resulting in that 

 perfect fitting together and fixity of parts exhibited in the geirus Echinoccrus, 



as described above. 



The natural position of Paralomis lies between Ecldnoccrus and LepioUihodes, 



Paralomis diomedese Fax. 



P/ate VIL, Fig. 3, 3% 3K 



Echinocenis diomedem Fax., Bull. Mus. Cornp. ZooL, XXIV. 16d', 1893. 



Carapace subpentagonal, gastric and branchial regions inflated, the whole 

 surface beset with tubercles which give rise to minute seto). There is one 

 rather more prominent tubercle in the depression on each side of the gastric 



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area. Rostrum short, three-spined ; one of the spines is median and inferior^ 

 two are paired near the base above ; in one of the two specimens obtained 

 the median spine is toothed below. The antero-lateral margin of the cara- 

 pace is irregularly toothed. Eye-stalks spinulose above, with one prominent 

 spine projecting forward over the cornea. The movable scale or spine of 

 the antenna is spinulose on each side (four or five spines on each margin). 

 The merus of the cheliped bears a spine on the inner side at the distal end; 

 the carpus is smooth outside, the inner border expanded into a seven-toothed 

 crest setose within, the outer border straight, naked, and keeled; the chelae 

 are of unequal size (the right being the larger), setose, spiny on the upper 

 edge, fingers spoon-shaped within, setose and somewhat gaping. 



Ambulatory appendages : the meri are spinose on their edges; the ante- 

 rior border of the carpus of the first pair is furnished with a crest whose 

 edge is even and entire ; the propodite of the first pair is crested along the 

 proximal half of its anterior border, while the distal half is armed with two 

 or three teeth; the carpus and propodite of the second and third pairs are 

 toothed on the anterior margin, the propodite of the third pair is also toothed 

 on the posterior margin; all the segments are hirsute, especially the dactyli. 

 When the leo-s are closely folded against the sides of the carapace a wide 

 interval is left between the carpi of the cheliped and first pair of ambulatory 



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