. Bulletin - United States National Museum. Science. THE CAXCROID CRABS OF AJMEEICA 61 eighth narrower than seventh, first and second equally advanced, first very small, on a higher level than the second and bent so as to form part of the orbital margin. Lateral spine long and narrow, directed outward and upward; 20 to 25 denticles on its anterior m^irgin. Posterior angles of carapace with a slender curved spine directed upward, forward, and outward. Superior fissures of orbit open, V-shaped, as are also the two outer fissures; one of these is in line with the second antero-lateral tooth, the
. Bulletin - United States National Museum. Science. THE CAXCROID CRABS OF AJMEEICA 61 eighth narrower than seventh, first and second equally advanced, first very small, on a higher level than the second and bent so as to form part of the orbital margin. Lateral spine long and narrow, directed outward and upward; 20 to 25 denticles on its anterior m^irgin. Posterior angles of carapace with a slender curved spine directed upward, forward, and outward. Superior fissures of orbit open, V-shaped, as are also the two outer fissures; one of these is in line with the second antero-lateral tooth, the other is below, in the customary place; on the intervening lobe a stridulating mechanism begins and continues to a point opposite the penult lateral sinus, gradually curving away from the margin; the striae are about 24 and become progressively shorter, the last being only a granule. Inner suborbital tooth large, concave below; next it a smaller tooth, followed by an oblique margin cut into 6 or 7 symmet- rical denticles, situated so as to form a continuation of the stridulating apparatus. Chelipeds short and stout. An- terior margin of merus denticulate and with two spines and a tubercle, the proximal spine narrower and sharper than the other; a slender figure 9.—postuxus (portuxus) vocaxs, spine at postero-distal angle; the male (esso), carapace mm. wide, ven- •^ c 1 . TRAL VIEW TO SHOW STEIDrLATIXG RIDGE upper surface has a crescentic stridulating ridge halfway across its middle which plays against the ridge on the carapace. Carinae of carpus and manus prominent, denticidate; inner carpal spine large, outer small. Two spines on manus, the supero-subdistal one a little smaller than the prominent proximal one; 5 carinae on upper-outer surface; upper carina sinu- ous, overhanging inner surface. Fingers thick at base, the large tooth on each finger of the major chela strongly outstanding. Ambulatory legs long and very slender. Merus of s%vimming leg small, about three t
Size: 2188px × 1142px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
