312 RECORDS OF THE AUSTRALIAN MUSEUM. 



The ambulatory legs vary somewhat with age, being shorter and 

 thicker in .smaller than in larger specimens. The first is the longest 

 and reaches to or beyond the scaphocerite. The ischium is armed 

 with a spinule, and there are three more on the lower exterior 

 margin of the merus. The carpus lias two spinules, and the 

 lower margin of the propodus bears a row of minute spiniform 

 seta?. Thedactylus also has some teeth on its lower edge. There 

 are scattered seta? on the end of the merus and on the following 

 joints. All three pairs of ambulatory legs are similar, except in 

 length. 



The telson has three pairs of spinules on its upper surface, and 

 ends in an acute point, on either side of which are three spinules, 

 the median being the longest. 



Obs. — Rhynchocinetes rugulosus is a common species around 

 Sydney, inhabiting dark crevices between rocks and in weedy 

 pools. It is very beautifully marked when alive with streaks 

 and dots of a bright blue colour on a darker ground. There are 

 also specimens in the Australian Museum collection from Lord 

 Howe Island. 



According to Stimpson, the anterior part of the rostrum in the 

 type specimens was tridentate. In all that I have seen there are 

 five or six teeth at the tip of the rostrum. My specimens being 

 from the same locailty as the types, however, places their identi- 

 fication beyond doubt. 



Rhynchocinetes typus, M. Edw., is included in the Australian 

 fauna on the authority of Miers, 5 who wrote in the Catalogue of 

 New Zealand Crustacea that it was found also on the coasts of 

 Australia and Chili. I have not seen this species, and think that 

 he probably confused it with R. rugulosus, Stimp., which, however, 

 appears to be readily distinguished by having fewer teeth on the 

 upper and lower margins of the rostrum. 



Having sent Miss M, J. Rathbun a tracing of my figure of R. 

 rugulosus for comparison with specimens of R. typus, she has 

 very kindly favoured me with the following notes. 



The rostrum has seven or eight spines above, near the tip, and 

 they occupy a greater space than in R. rugulosus; there are nineteen 

 spines below. Maxillipeds longer and more slender ; antennal 

 scale not reaching the last segment of the maxilliped. Carpus 

 of the first leg less than half as long as the propodus, and equal 

 to the dactylus in length; margins of the palm not convex. 

 Second leg very little longer than the first ; propodus about four- 

 fifths as long as the carpus and not stouter than that joint. 



Miers— Cat. Crust. N. Zealand, 1876, p. 77. 



