REPORT ON THE CRUSTACEA MACRURA. 465 



being rather longer than the others and a little shorter than the carapace. Each of 

 these somites is furnished with a tooth that projects from the lateral margin, just out- 

 side the articulation of the pleopoda (these are not shown in our figure of the male, but 

 they resemble those shown in the female, excepting that they are less prominent and 

 decrease in size posteriorly). 



The sixth somite equals in length the two preceding combined, it is dorsally armed 

 with a small tooth at the posterior extremity, and is furnished with two teeth on the 

 lateral margins, the larger of which is about a fourth of the length of the somite 

 distant from its posterior extremity, and the smaller is near the centre ; both teeth are 

 straight and directed posteriorly. 



The telson is about one-fourth the length of the sixth somite, and is furnished 

 posteriorly on the inferior surface with an obbquely directed lobe. 



The ophthalmopoda are long and pyriform, about one-third the length of the antennal 

 somite. 



The first pair of antennae has the first joint of the peduncle rather shorter than the 

 ophthalmopoda ; second joint shorter than half the first ; third joint shorter than the 

 second, and supports a slender flagellum that is about as long as the antennal somite 

 and carapace together, and has not even the rudiment of a secondary branch. 



The second pair of antennas has the first or coxal joint of the peduncle furnished with 

 a long, projecting, slender tubular phymacerite ; the terminal joint reaches anteriorly 

 nearly as far as the extremity of the ophthalmopoda, and is both strong and robust, 

 it supports a terminal flagellum that suddenly becomes very slender and equals 

 in length about one-half of the animal. At the base of the peduncle stands a 

 narrow styliform scaphocerite, quite as long as the ophthalmopoda, and ends in a 

 subapical point. 



The epistoma anteriorly projects as a strong protuberance, and inferiorly forms the 

 anterior labrum between which and the metastoma the mandibles are impacted ; posterior 

 to which the small fobaceous maxillaa are apparent. 



The first pair of gnathopoda has the first three joints anteriorly directed and the 

 last three posteriorly reflexed against them, the sixth or last being long and spatuliform, 

 fringed on the inner margin with long, slender hairs, as is also the penultimate joint, 

 while the antepenultimate is furnished with hairs on the lateral surface. 



The second pair of gnathopoda is long, slender, and subequal to the next succeeding 

 or first pair of pereiopoda. 



The second and third pairs of pereiopoda are much longer than the first and are 

 subequal in length ; the second is simple and terminates in a blunt point, while the 

 third or terminal pair is furnished with a minute, curved, sharp dactylos, which is 

 fringed with long hairs, as is also the inner extremity of the preceding joint. 



The first pair of pleopoda is long, slender, and has the basal joint longer than the 



(ZOOL. CHALL. EXP. PART LH. 1887.) Fff 59 



