1896.] J.R.Henderson — Some "Investigator" Paguridse. £>33 



least to show that characters derived from the gills are of somewhat 

 doubtful value in the classification of the Paguridae. On the other 

 hand the species of Sympagurus do not appear as a rule to reach the 

 great depths at which species of Parapagurus are found, and in some 

 of the species, including the one about to be described, the eye-stalks, 

 unlike those of the last named genus, exhibit a certain amount of 

 dilatation. Moreover the gill-branches of Parapagurus are more or 

 less filamentous, while those of Sympagurus are lamellate. For the 

 present the two genera may therefore I think be kept separate. 



14. * Sympagurus monstrosus, (Alcock). 

 (?) Parapagurus monstrosus, Alcock, Ann. Mag. Nat. Hist. (6) xiii. 1894, p. 243. 



Station 151, off the coast of Ceylon, depth J42 to 400 fathoms. 

 Four specimens. 



Station 162, off the'Madras Coast, depth 145 to 250 fathoms. A 

 large number of specimens, the majority inhabiting Bostellaria shells, 

 some of which have an investing Epizoanthus, others an Actinia. 



The anterior portion of the carapace is slightly convex, with a 

 curved line on either side terminating behind the basal joint of the 

 autennal peduncle. The three frontal projections are slight, but the 

 median one exhibits a faint dorsal carina. The eye-stalks are stout, 

 with the upper surface slightly pubescent, and the corneae consider- 

 ably dilated. The ophthalmic scales are broad basally, but acute and 

 spinulous at the apex. The antennal peduncle only slightly exceeds 

 the eye-stalk ; the acicle is moderately curved, with its inner margin 

 dentate ; the external prolongation of the second peduncular joint is 

 spinulous. The antennular peduncle exceeds the eye-stalk by slightly 

 more than the length of the terminal peduncular joint. 



The chelipedes are slightly pubescent, and yet glabrous, with the 

 terminal joints of the larger one regularly dentate. The right cheli- 

 pede has the merus provided with a serrated lobe on its lower distal 

 margin, while the upper margin is more faintly serrated, and the outer 

 surface is obscurely tuberculate. The carpus is considerably swollen 

 below, and all its projecting margins are dentate, the denticles being 

 best marked on the outer margin, and on the lower and inner margin. 

 The upper surface of the hand is regulaidy arched or convex from end 

 to end, the curvature showing clearly on the thin outer margin ; both 

 inner and outer margins are regularly dentate, the thick inner margiu 

 showing & double line of denticles. The upper surface of the hand is 

 smooth and glabrous, only a few minute granules being present, but it 

 is at the same time more or less pubescent. The ringers are strongly 

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



J. ii. 68 



