THE SPECIES OF AEGLA — SCHMITT 513 



AEGLA RIOLIMAYANA, new species 



Figure 64 ; Plate 28, E 



Description. — A species of perhaps moderate size, the largest speci- 

 men so far seen does not exceed 24.0 mm. in length of carapace and 

 rostrum together. Stands near the preceding species, A. dbtao. 



Like A. abtao^ our species has the carapace moderately convex; 

 the rostrum, though basally broad and flattened, distally is narrowly 

 and sharply triangular, almost stilletolike, straight, and more or less 

 sharply carinated to the tip {A. rioliTiiayana has the most sharply 

 acuminate and distally narrowed rostrum of all species included in 

 the A' section of our diagnostic key) ; the tip of the rostrum extends 

 beyond the eyestalks by about one-half the length of the cornea ; the 

 rostral carina is armed with a somewhat wavering, virtually single 

 line of small tiny corneous scales, which get a little larger anteriorly ; 

 toward the tip these scales sometimes, for a very brief interval, may 

 form an irregular double row; the dorsal surface of the rostrum is 

 noticeably depressed or excavate either side between the rostral carina 

 and the seemingly elevated lateral margins of the rostrum ; the rostral 

 carina runs back about to the level of the anterior margins of the 

 protogastric lobes which, like the epigastric prominences, are not 

 particularly well marked. 



Orbital sinus relatively wide, orbital spine but a spinule, extra- 

 orbital sinus small, at times scarcely more than a notch at the base 

 of the inner slope or margin of the anterolateral spine; the latter 

 small, conical, scarcely reaching the posterior margin of the cornea. 



Anterolateral angle of the first hepatic lobe well marked, though no 

 more than scabrous with corneous scales no larger than the others 

 with which the lateral margins of the hepatic lobes are armed; 

 second and third hepatic lobes scarcely more than sinuosities in the 

 lateral margin of the forepart of the carapace. 



Hand of moderate size, moderately inflated ; lobular tooth on fixed 

 finger relatively small but plainly marked; a definite, though small, 

 spined lobe on outer margin of movable finger near base. Palmar 

 crest resembling that of A. laevis, outer margin of crest more or less 

 subparallel to upper margin of palm proper, and cut into three or four 

 scabrous-margined shallow serrations, anterior angles or apices of 

 serrations, however, armed with a sharp-pointed scale or spinule; 

 as in yl. laevis there is a more or less definitely right-angled notch 

 between anterior end of the palmar crest and the anterior dorsal 

 margin of palm. 



Ridge of carpus of cheliped above spined inner margin not promi- 

 nent, low and obsolescently nodulated ; armed on these low swellings 

 with a few small corneous denticles or scales; spined inner margin 

 armed with slender, conical, clean-cut spines, of which the anterior- 



