PILUMNIDAE. 55 



Dimensions: — Length of type 9 37.2 mm., width 59.5 mm. 



Distribution : — 



Nukuhiva, Marquesas Ids.; shore, seine; Sept. 15-17, 1899; 1 ? (type), 

 1 9 juv. (Cat. No. 32,853, U. S. N. M.). 



Papeete, Tahiti; reef; Sept. 28, 1899; 1 <? juv. 



In the two young specimens, the granules of the surface are almost 

 effaced, but the carapace appears more eroded, the teeth of the front are 

 less prominent, those of the sides more prominent than in the adult. 

 The chelipeds are very unequal, the fingers of the larger one gape 

 narrowly. 



In the shape and number of the front and side teeth this species re- 

 sembles 0. verreauxii Saussure, which, however, is flatter and has only one 

 transverse crest. 



Pilumnus andersoni de Man. 



Pilumnua andersoni Rathbun, Bull. U. S. Fish Comm. for 1903 (1906), part 3, 863. 



Funafuti, Ellice Ids.; reef; Dec. 24, 1899; 1 <?, 1 ?. 



Ponape, Caroline Ids; reef; Feb. 11, 1900; 2 <?, 3 ? (1 ovigerous). 



The specimens from Ponape have the first of the 3 lateral spines further 

 from the orbit than in typical andersoni, and the antero-lateral margin cor- 

 respondingly longer. All of the 7 individuals are small, the largest measuring 

 7.3 mm. in width. 



Pilumnus Cursor A. Milne Edwards. 

 Pilumnus cursor Alcock, 1898, 67, 195. 



Funafuti; reef; Dec. 24, 1S99 ; 1 immature ?, which agrees with the 

 description given by de Man 1 but has shorter legs than represented in 

 the figure by A. Milne Edwards. 2 The specimen is only 4.2 mm. long, 

 the second or longest ambulatory leg is 7.5 mm. long. 



1 Arch. f. Naturg., 1887, 53, part 1, 299. 



2 Nouv. Arch. Mus. Hist. Nat., 1873, 9, pi. 9, fig. 4. 



