REPORT ON THE CRUSTACEA MACRURA. 



r.sr, 



First pair of antennae more robust than the second. 



First pair of pereiopoda shorter and more robust than the second. 



Telson about half the length of the lateral plates of the rhipidura. 



Length, entire, 



„ of rostrum, 



„ of carapace, 



Depth of carapace, 



Length of pleon, . 



,, of telson, . 



6 mm. (0'2 in.). 

 1-5 „ 

 1-5 „ 



1 „ 



4-5 „ 

 0-G .. 



Habitat. — Off Sibago, Samboangan, Philippine Islands, October 23, 1874. 

 specimen. 



One 



The body of the animal is moderately robust, the carapace being the broadest part 

 and dorsally elevated, anteriorly depressed and produced to a deep, laterally compressed 

 rostrum, which projects to an acute point at the apex and is armed with a serrature of 

 teeth, five of which are below the apex and ten above ; the dorsal surface of the 

 carapace is smooth, rising behind the gastric region, and continuous with the dorsal 

 surface of the pleon. The telson is about half the length of the sixth somite. 



The ophthalmopoda are short, stout, and carry a prominent tooth on the inner 

 side of the globular ophthalmus. 



The first pair of antennas has the first joint of the peduncle subequal in length 

 with the ophthalniopod and curved in correspondence with it, the upper distal angle 

 being produced to a strong tooth or process ; the second and third joints are short and 

 subequal in length, and produced on the upper distal angle. The inner flagellum is 

 short, stout, and tapering, reaching a little beyond the apex of the rostrum, it is 

 multiarticulate, and fasciculi of membranous cilia arise from alternate articuli. 



The second pair of antennas is broken off at the extremity of the peduncle ; the 

 scaphocerite is narrow and reaches nearly to the distal extremity of the rostrum. 



The oral appendages have not been examined in this species. 



The second pair of gnathopoda is moderately long and robust ; the lower or 

 posterior surface is smooth and straight, the upper or anterior is arcuate and furnished 

 with transverse rows of fasciculi of hairs, and tapers to an acute point. 



The first pair of pereiopoda is short and robust. The second pair is long and 

 slender, and terminates in a chela that has the dactylos longer than the pollex. The 

 posterior three pairs of pereiopoda are slender and subequal, and terminate in a 

 moderately long and slender dactylos, the propodos of each being fringed with fasciculi 

 of hairs. 



The first pair of pleopoda is simple, the others are biramose, the posterior pair 

 being furnished with subequal rami that terminate in rounded extremities. 



Observations. — This species was found associated with Latreutes unidentattis. 



(ZOOL. CHALL. ESP. — PART LIL — 1887). Fff 74 



