Boone, Crustacea, Cruise of "Alva," 1931 51 



tending from margin to margin, where each bears one of the 

 lateral spines; each ridge is microscopically granulated and 

 fringed anteriorly with fine, short, amber setae; a fifth, short, 

 incomplete ridge occurs across the rostral base. There are about 

 six similar complete ridges on the postcervical region. The linea 

 anomurica is distinct in the young specimen. The lower lateral 

 wall of the carapace is ornamented with three oblique ridges that 

 curve forward and also a row of four or five denticles below 

 the eye. 



The abdominal segments are devoid of spines in these young 

 specimens ; the second, third and fourth segments each have their 

 anterior margins fringed with fine setae; and each has a trans- 

 verse ridge, also setae-fringed anteriorly ; the fifth and sixth seg- 

 ments have only very faint transverse lines and are quite gla- 

 brous ; the telson has the posterior margin broadly rounded, evenly 

 bilobate ; there is a median longitudinal groove and the posterior 

 suture lines are oblique ; there are a pair of squamae-like arcs edged 

 with fine setae, proximally, faintly delineated on the translucent 

 telson. The uropoda are large, fan-like, the peduncle wide with an 

 acute tooth at the upper inner posterior angle ; the inner blade is 

 the larger, with the distal margin unevenly truncate, slightly 

 rounded; the outer blade is slightly smaller and more regularly 

 rounded distally. On the dorsal surface of the large blade there 

 are several arcs of minute setae emphasizing the posterior border 

 of half-circle squamae-like formations which in older specimens 

 probably become definite squamae. The telson and rhipidura both 

 have the distal margins heavily fringed with long, web-like setae. 



The eye is large, bulbous, with a short, thick stalk and hemi- 

 spherical cornea, set obliquely terminal, so that its lower fronto- 

 lateral surface is much greater than the dorsal. 



The antennulae extend beyond the rostrum a short distance 

 and have the peduncular joints enlarged, the distal peduncular 

 article produced at the outer distal angle into a strong spine that 

 protects the orbit; and has also a slenderer long, median distal 

 spine and another spine subequal to it at the inner inferior distal 

 angle; the flagellum is short, slender, tufted with setae distally, 

 usually concealed on the inner side of the peduncle but when ex- 

 tended reaching a little beyond the rostrum. 



The antennal peduncle has only the distal two articles visible 

 dovsally; these are successively smaller, each about as wide as 



