ZOOLOGY OF FERNANDO NORONIIA. 



517 



middle line at a very obtuse angle. Carapace nearly smooth 

 frontal spines considerably sliorter than the eye-stalks, slightly 

 incurved at the apices, armed above at the base with a single 

 spine ; one spine situated near the ocular margin of the carapace, 

 one in the anterior third of the supero-lateral margin, and a 

 third beneath the eye-stalk near the outer portion of the basal 

 antenual segment. 



Antennal peduncle about two thirds tlie length of the 

 carapace ; basal segment armed externally with a single spine oq 

 its anterior margin; second segment armed above with five spines, 

 two forming a longitudinal series externally, three forming an 

 oblique series internally ; third segment armed above with ten 

 short spines. Below, the three segments are smooth. 



Antennular plate nearly horizontal, with rounded antero- 

 external angles not armed with spines ; the peduncle shorter than 

 peduncle of antennae ; segments of peduncle not spined. 



Epistoma with a straight unspined anterior margin. 



The first and fifth pairs of limbs simple, unspined. (Second, 

 third, and fourth pairs absent.) 



Postero-external angles of the sternum prolonged into a sharp, 

 long spine. 



Abdominal tergites smooth, punctured, not marked with a 

 transverse sulcus; inferiorly and laterally prolonged into a spine. 

 The posterior margin of tlie last dorsal plate furnished with two 

 long, sharp spines. 



Proximal portion of telson furnished in the middle of its 

 upper surface with two spines and with its posterior margin 

 armed on each side with four spines. 



Total length from anterior margin of carapace to posterior 

 margin of telson 27 miliim. Length of upper surface of carapace 

 11 miliim. 



One specimen. 



Judging from its size, the specimen from which the above 

 description has been taken is certainly immature. It, never- 

 theless, presents the characters of a true PanuliruSf and difi*ers 

 from all the specimens of that genus that I have examined in 

 the absence of spines from the basal plate of the antennulse. 

 Dredged in Water Bay. About 10 fathoms depth. 



