296 (i. 0. SARS, 



donse transverse row of very slender anteriorly curving set.e. The nieral 

 joint is so very minute as easily to escape attention. The carpus, on tlie 

 other hand, is very large and compressed, almost fiisiforin in outline, and is 

 very densely setiferous, especially on the lower edge. The propodos is some- 

 what shorter than the carpus, slightly curved, and rather narrow, though 

 gradually widening distally, being densely clothed anteriorly with slender 

 bristles, partly airanged iu transverse rows. The palm is very short and 

 transverse, being defined below by a distinctly projecting corner; its edge 

 is minutely spinulose. The dactylus is comparatively slender, and extends 

 considerably beyond the defining corner of the palm, when closed. 



The posterior gnathopoda (fig. 13) are more strongly built than the 

 anterior, and of a very difterent structure. The basal joint is rather thick 

 and not much elongated, being firmly connected with the extremely short, 

 nc'arly band-shaped iscliial joint. The meral joint is peculiarly develciped, 

 being produced along the lower side of the carpus to a broad, lamellar ex- 

 pansion, which is firmly connected to the latter, though defined by a dis- 

 tinct suture. The expansion, which extends until the end of the cari)us, is 

 fringed with a double row of exceedingly long and slender set;c, which are 

 finely ciliated and curved anteriorly, forming together a broad fan. The 

 propodos is very narrow and elongated, sublinear in form, and clothed on 

 both edges with fascicles of slender bristles. It projects at the end below the 

 dactylus to an acute corner; but no distinct palm is present. The dactylus 

 is slender and curved, being armed on the concave edge with 4 strong 

 secondary denticles. 



The 2 anterior pairs of pereiopoda (PI. XXI, fig. 5) are exactly alike 

 both in size and structure, and are rather slender, compared with those 

 in the othei- species. The basal joint is slightly expanded and, as in the 

 other species, contains a glandular mass, which probably serves to secrete 

 a viscid fluid to be used for constructing the dwelling tubes. The meral 

 joint is about the length of the last 2 combined, and is not much expanded, 

 terminating at the end anteriorly in an obtuse corner. Anteriorly this joint 

 is in the male clothed with slender diverging bristles, forming a very dense 

 brush. The propodal joint is very narrow and conically tapering, with scat- 

 tered small bristles on the edge and at the tip. The dactylus is about the 

 length of that joint and very slender, terminating in a sharp point. 



The 2 succeeding pairs of pereiopoda (figs. G and 7) are comparatively 

 short and stout, and of essentially the same structure, though somewhat 

 unequal in size, the antepenultimate pair (fig. 6) being considerably shorter 

 than the penultimate one (fig. 7). In both pairs the basal joint is rather ex- 

 panded and of an oval fusiform shape, but in the autei)enultimate pair its 



$U3.-MaT. CTp. 204. 22 



