REPORT ON THE CRUSTACEA MACRURA. 



879 



This specimen was taken in the same locality as Oodeopus geminidentatus and has 



the folio wing measurements :- 



Observations. — These specimens appear to me to belong to the same genus as the 

 preceding, but they are in a less advanced condition. That they are the young of a 

 larger species is probable, inasmuch as one is as large in size, although in a younger stage. 



Oodeopus armatus, n. sp. (PI. CXLII. fig. 4). 



Carapace dorsally smooth and anteriorly produced to a rostrum that is a little longer 

 than the carapace. 



Pleon three times as long as the carapace and armed dorsally on all the somites, 

 excepting the first, with large teeth, the anterior of which is the largest, the others 

 decreasing in size gradually to the last ; the sixth somite is subequal to the three preceding 

 in length, and the telson is subequal with the sixth somite. 



The ophthalmus is ovate, but less pointed anteriorly than in Oodeopus serratus. 



The antennae and pereionic appendages are still in an immature condition, and the 

 terminal pleopoda, which appear to be the only pair developed, do not as yet reach 

 the length of the telson. 



Length, entire, 



of carapace, 



of rostrum, 



of pleon, 



of sixth somite of pleon, 



of telson, . 



Habitat. - 



-The New Hebrides, August 18 



7 mm. (0-3 in.). 

 2 



2-4 

 5 



1-5 

 1-5 



; Cape York, September G, 1874 ; surface. 



Oodeopus intermedins, n. sp. (PI. CXLIII. fig. 1). 



Carapace about one-fifth the length of the animal, dorsally smooth, and anteriorly 

 produced to a rostrum that is about three times the length of the carapace, and has 

 the lateral margins serrate; the fronto-lateral angle is short and the lateral margin 

 slightly serrate near the anterior extremity. 



The pleon is four times as long as the carapace, and has the first somite short and 

 smooth, the second is dorsally armed with a tooth originating from the posterior margin, 



