526 J. R. Henderson — Some '^ Invest iyator" Pagiuidss. [No. 3, 



MoreoTeT in the latter species the dactyli resemble sword-blades, and 

 aie perhaps used for swimming. The American species described by 

 A. Milne-Edwards, and S. I. Smith, come from deep water, and have 

 the sexual organ shorter, stouter, and simply bent rouud the abdomen, 

 whereas in the species just described, and probably in the two other 

 Indo-Pacific forms, the organ is much longer, more slender, and 

 capable of being coiled after the fashion of Spiropagurtis. These 

 differences are not in my opinion sufficiently important to separate the 

 eastern and western species generically. 



Genus Pagcristes, Dana. 

 10. * Paguristes jp-iisUlus, n. sp. 



Station 175, off the east coast of Ceylon, depth 28 fathoms. 

 Three males, and two females with ova. 



The median frontal projection is prominent, extending well be- 

 tween the ophthalmic scales, and is at the same time subacute and 

 deflexed ; the lateral frontal projections are also subacute. The eye- 

 stalks are long, exceeding the antennal peduncles by about half their 

 length, and even slightly exceeding the antenuular peduncles. The 

 ophthalmic scales have their apices in some cases minutely bidentate, 

 or even tridentate, in other cases they are apparently entire. The 

 untennal acicle scarcely reaches the end of the ultimate peduncular 

 joint, and exhibits three well marked spinules on its outer margin ; 

 the external prolongation of the second joint is apparently bispinose. 

 The antennal flagellura is extremely short, being only slightly longer 

 than the eye-stalk ; it is only sparingly ciliated. 



The chelipedes are subequal, or the left is very slightly larger ; 

 they are without prominent hairs anywhere, and the upper surface 

 of the carpus, propodus, and dactylus, is uniformly provided with 

 subspiniform granules. These granules become distinctly spinose on 

 the inner margin of the carpus and propodus, especially on the former 

 joint, Avhich is longer than the hand. A few spinules are also met 

 with at the distal end of the mertis, both on its upper and its lower 

 margin. The fingers are in contact throughout their length, and are 

 without prominent teeth. 



The ambulatory legs are of moderate length ; the first pair with 

 their carpal and propodal joints spinulose anteriorly, the dactylus less 

 distinctly so ; the second pair are almost devoid of spinules. Both 

 pairs are faintly pubescent. The propodi of both pairs are slightly 

 shorter than the dactyli. 



The following colour markings are still visible. The eye-stalks, 

 antennal, and antennular peduncles, are purplish. The meral joints 

 * 111. Zool. Investigator, Crustacea, pi. xxxi. fig. 4 (in preparation). 



