REPORT ON THE CRUSTACEA MACRURA. 35 



When viewed dorsally the carapace is broad, having a straight projeeting rostrum 

 extending little beyond the limit of the eyes. There is no distinct excavation or orbit to 

 receive the eyes, but outside and beneath there is a deep notch, caused by the anterior 

 production of the lateral or branchial walls of the carapace. From this point a deep line 

 is prolonged backward to the posterior margin, thus indicating very distinctly, by a clearly- 

 defined line, the part which separates the internal viscera from the external, or the 

 gastric and cardiac regions from the branchial. There is also a deep cervical furrow 

 connecting the lateral depressions corresponding with the posterior margin of the cardiac 

 region, and separating it from the post-cardiac. 



The pleon is about twice as long as the carapace, and has the second somite as long 

 again as the first, the others not quite so long as the second, and subequal to each 

 other. Telson quadrate, slightly hollowed out in the posterior margin, but the immediate 

 centre of the excavation is occupied by a very small pointed projection or tooth, on each 

 side of which are several short hairs, and a bunch of extremely long ones. 



The ophthalmopod, or eye-stalk, is globose, almost round, with a small slightly pro- 

 jecting eye at the anterior extremity. 



The first pair of antennae has a long peduncle, the first two joints of which are short 

 and the third long. The upper or inner flagellum is much stouter than the lower or outer, 

 a feature that is generally characteristic of a male ; it is about the same length as the 

 peduncle ; it is small at the base, and gradually increases in size to near the extremity, 

 when it again rapidly decreases ; the articuli are extremely short and numerous. The 

 outer or lower flagellum is slender, and about the same length as the upper. 



The second pair of antenna? has been destroyed beyond the peduncle, which reaches 

 farther than the extremity of that of the upper. 



The second pair of gnathopoda has a long and nearly straight dactylos, an equally 

 long propodos, and short carpos ; the meros is short and the ischium long, and all the 

 joints are copiously fringed with long hairs. 



The pereiopoda are wanting, except the posterior pair, which terminates in a minute 

 chelate hand enclosed in a thick brush of hairs, some of which are ciliated on one side. 



The branchial appendages consist of five posterior and six anterior arthrobranchiaa, as 

 shown in the annexed table. 



Pleurobranchiae, . . 



Artlirobranchia>, . . 1 2 2 2 2 



Podobranchi,-p, . . 



Mastigobranchia?, . . 



g h i k 1 in n o 



These consist of cylindrical digitiform processes attached to a stem forming a plume, 

 of which those at the base are long and exposed below the lateral margin of the carapace, 

 where the extremities are visible as a row of small grape or bead-like bodies. 



