REPORT ON THE CRUSTACEA MACRURA. 871 



both have the chela long, fringed, with their margins serrate, but the system of dentation 

 is somewhat different ; the teeth are sharper, more resembling each other on the pollex 

 and dactylos, and fall more obliquely forward. 



Habitat.— Station 236, June 5, 1875 ; lat. 34° 58' N., long. 139° 29' E.; depth, 

 775 fathoms; bottom, green mud; bottom temperature, 37°"6. One specimen, 

 fragmentary. Trawled. 



Our only specimen is imperfect, the pleon with its appendages and all the pereion 

 and its appendage posterior to the second pair of pereiopoda are wanting ; but what 

 remains is sufficient to identify it as a distinct species from any other known to me. 



The length of the carapace is about 19 mm., and assuming that it is about one-third 

 of the length of the animal, or a little less, we may consider the entire length of the 

 perfect animal to be from about 75 to 80 mm., or about three inches. 



Pasiphwa acutifrons, n. sp. (PI. CXLI. fig. 3). 



Carapace one-third of the length of the animal, laterally compressed, dorsally carinated, 

 and anteriorly armed with a strong sharp tooth abruptly elevated over the frontal region; 

 anterior margin in front of the tooth not carinated, slightly advanced between the ophthal- 

 mopoda, but not enough to form a rostrum. Orbits imperfectly excavate ; first antennal 

 tooth feeble ; second antennal tooth small but well defined, thence the frontal margin 

 recedes until it meets the lateral margin of the carapace, which gradually recedes 

 oblicpiely to the posterior margin. 



Pleon slightly carinated on the second and following somites. 



Telson (fig. 3z) laterally compressed, dorsally grooved, posteriorly forked, and nearly as 

 long as the sixth somite of the pleon. 



The ophthalmopoda short, stout, and standing on a small pedicle. 



The first pair of antennse having the first joint of the peduncle excavate on the upper 

 surface, and armed with a stylocerite that is sharply pointed and as long as the 

 joint ; the two succeeding joints are short, subequal and cylindrical, and carry two 

 flagella that are very slender and about half the length of the animal. 



The second pair of antennae has a scaphocerite that reaches beyond the distal 

 extremity of the peduncle of the first pair, and gradually tapers to a point, which is 

 armed on the outer angle with a strong tooth. 



The gnathopoda correspond with those of the preceding species. 



The first two pairs of pereiopoda also agree, excepting that both pairs have the 

 posterior margin of the meros armed with teeth, but these are few in number, and fewer 

 on the first than on the second. The three following pairs are short, slight, and 

 correspond with the generic type. 



