1002 MB. L. A. BORRAUAILE ON CKUSTACEANS [DeC. 13, 



the legs the carpus the longest joint ; M'ithout a rudiment of the 

 anterior arthrobranch on the fourth leg (?) ; with the riglit side of 

 the petasma louger than the left; fifth and sixth abdominal 

 segments with well-marked dorsal keel, fourth and fifth segments 

 ending in two spines, sixth in one spine ; telson elongate, triangular, 

 ending in a point, and armed on each side witli four spines, of 

 which the last but one is the longest, while the most anterior 

 is the smallest and the most distant from the rest." 



Length of present specimen 42 mm. from tip of rostrum to end 

 of telson. 



Tlie inner flagellum of the first antenna appears to be broken 

 off near the tip on each side. 



The systematic position of this species must remain somewhat 

 doubtful till the collection of a series of specimens shall render it 

 possible to decide the branchial formula. So far as could be 

 ascertained without considerable injury to the single specimen, 

 this is identical witli that given by AVood-Mason and Alcock [Ann. 

 Mag. N. H. (6) viii. p. 273 (1891)] for M. conir/er, with the excep- 

 tion of the absence of the rudiment of an anterior arthrobranch 

 on the fourth leg. This, however, is also wanting in M. recf- 

 acutus (Bate). The nearest ally of the new species would appear 

 to he. M. pliilippinensis (Bate) [' Challenger ' Macrura, p. 261] ; 

 from which, however, it differs in having an additional tooth on 

 the rostrum, in the length of that organ and of the antennal scale, 

 in having the right, and not the left, side of the petasma the longer, 

 and in the absence of the rudiment of an anterior artlu'obranch on 

 the seventh thoracic segment. 



The living animal is almost transparent, with two or three bright 

 pink bands. Its habits are most interesting. Mr. Gardiner found 

 it living in the stomodaeum of a green and yellow actinian, 14 cm. 

 broad, allied to Discosoma Jiaddoni. Also commensal in the same 

 actinian was a small fish with bright red and yellow bands, 

 identified by Mr. Boulenger as Coris greenoughi. 



One male specimen from Eotuma. 



Tribe STENOPIDBA. 



Family S t e bt o p i d .Ti. 



Genus SiEwoprs Latreille, 1825. 



2. Stenopus hispidus (Olivier), 1811. (Plate LXIII. figs. 2a, 

 2h.) 



Pala'mon hispidus, Olivier, Encycl. viii. p. 6G6 (1811). 



Stenopus hispidus, Latreille, Desmarest's Consid. sur les Crust, 

 p. 227 (1825) ; H. M.-Edwards, H. N. Crust, ii. p. 407 (1837) ; 

 id. Cuvier's E. An. 3rd ed., Crust, p. 137, pi. 1. fig. 2 ; Dana, U.S. 

 Expl. Expd., Crust, i. p. 607, pi. xl. fig. 8 (1852); Bate, 

 ' Challeuger ' Macrura, p. 211, pi. xxx. (1881). 



The males of this species differ from the females in the form of 



