REPORT ON THE CRUSTACEA MACRURA. 



633 



abruptly at the anterior margin of the third somite, and is produced to a strong, sharp 

 tooth at the posterior extremity of this and the two following somites. The sixth somite 

 is smooth and the telson is dorsally flat, and armed at the lateral angles with three small 

 spinules. 



The ophthalmopoda are of moderate size and orbicular. 



The first pair of antennae has the flagella of unequal length ; the shorter and more 

 robust is subequal with the rostrum, and the longer and more slender is half as long again. 



The second pair of antennas is longer than the animal, and carries a scaphocerite 

 which is nearly half the length of the rostrum. 



The second pair of gnathopoda is slender, but does not reach to the extremity of the 

 scaphocerite. 



The first pair of pereiopoda is more slender, and nearly as long as the second pair of 

 gnathopoda. The second pair of pereiopoda (figs. 1?, ll') has the appendage on the 

 right side (fig. ll) shorter and more robust than that on the left (fig. \V), and is long, 

 slender, and minutely chelate. The three following pairs have the meros serrate 

 posteriorly, the propodos fringed with short, stiff, hairdike spines, and the dactylos 

 styliform. 



The outer plates of the rhipidura are a little longer than the telson and furnished with 

 a perfect direresis, the outer angle of which is armed with small spines. 



Length, entire, . 



of carapace, 



of rostrum, 



of pleon, 



of third somite of pleon, 



of sixth somite of pleon, 



of telson, 



Habitat— Station 214, February 10, 1875; lat. 4° 33' N., long. 127° 6' R; south 

 of the Philippines; depth, 500 fathoms; bottom, blue mud; bottom temperature, 41°-8. 

 Fourteen specimens ; eight males, five females, and one young. Trawled. 



Station 232, May 12, 1875 ; lat. 35° 11' N., long. 139° 28' K; Hyalonema-gvoxmd, 

 off Japan; depth, 345 fathoms; bottom, green mud; bottom temperature, 41°'l. 

 One specimen ; male. Trawl and dredge both used. 



Length, 37 mm. 



This species is not very far separated from Heterocarpus oryx, A. Milne-Edwards, 1 

 but the teeth that form the dorsal armature commence over the gastric region, so that 

 there are only two small teeth on the carapace posterior to the rostrum. There 

 are only nine altogether on the upper surface and eleven on the lower, all of which 



1 Ann. d. Sci. Nat., ser. 6, torn, xi., art. 4, p. 10, 1881. 



(ZOOL. CHALL. EXP. — PART LII. 1887.) Fff 80 



