ILaguna C0arinc Laboratory 



Body very convex and oblong, about three times as long as wide, 

 7 nim. by 2.5 mm. being the dimensions of a small specimen. 



Head twice as wide as long with frontal margin rounded. Eyes 

 composite, occupying lateral margins of the bead. Second antenna 

 has a peduncle of five articles ; the first three are small ; fourth about 

 as long as first three ; fifth longer and narrower than fourth ; flagel- 

 lum composed of twenty-two articles ; in five specimens examined the 

 number of articles varied from twenty-two to twenty-nine, average 

 twenty-four.. Anteuuule has a peduncle of three articles ; first two 

 small and subequal; third half as wide and equal in length to the 

 first two ; flagellum composed of twelve articles, average out of five 

 specimens examined, ten articles ; maxillipeds composed of seven 

 articles; last five provided with many long plumose spines; third 

 article has two blunt hooks. Mandible robust, broad and strong 

 distally where it ends in a trideutate margin. Mandibular palp has 

 three articles. Frontal lamina short and broad and is sub-trian- 

 gulate at the distal end. 



First segment of thorax longer .than the following three, which 

 are subequal. Last three longer than the three preceding. Epiniera 

 distinct on all but first segment. Last foi;r segments marked with 

 an oblique, first two with a longitudinal carina. Epimera of last 

 three, especially of last two, segments produced at post-lateral 

 angles. First three legs prehensile, last four ambulatory. In the 

 first pair the propodus has three spines on the inner margin which 

 increase in size toward the distal end, where one long slender spine 

 also occurs ; on the outer distal end there are one or two slender 

 spines. The carpus usually has but one long spine ; the inerus has 

 five or six thick, blunt spines on the inner margin and two or three 

 sharp ones. On the outer distal end there are two long slender 

 spines; the ischium has one blunt spine on the inner distal margin 

 similar to the blunt spines on the nierus ; there is one long, stout one 

 and one long, slender spine on the outer distal end. The propodus 

 of the second and third legs has on the inner margin four spines 

 increasing in length toward the distal end. The carpus has three 

 blunt spines on the inner distal end. The merus has eight or nine 

 large spines on the inner margin; one long and strong and from one 

 to four shorter ones on the outer distal end. The ischium has two 

 very blunt spines at the inner distal end, and two or three smaller 

 spines at the outer distal extremity. Last four legs provided with 

 many stout spines. 



Abdomen composed of six visible segments. Last, triangular, 

 gradually narrows to a rounded apex which is provided with about 

 eight teeth and numerous long hairs. Peduncle of uropod is pro- 

 duced to two-thirds the length of the telson; inner ramus is wider 



