Fauna Associated with Crinoids of Tropical Coral Reef, etc. 



75 



List of animals commensal with crinoids on the reefs of Murray Island and off 



Mabuiag, Torres Straits, Australia. 



[Other forms described as commensals of crinoids in other areas are included 

 in brackets. Only those forms which show colour resemblance to 

 the host are included.] 



CRUSTACEA . 



Decapoda Macrura 

 Alpheidse. 



Pontoniidae. 



Decapoda Anomura. 



Isopoda 



Amphipoda. 



ECHINODEBMATA. Ophiuroidea . 



fPolychaftta 



ANNELIDA ] 



(.Myzostomida. 

 MOLLTJSCA Gasteropoda. 



fSynalpheus comatularum Haswell, S. brucei sp. n. 

 \ (S. stimpsonii var. maldivensis, Indian Ocean. 

 [S. carinatus var. binongeensis, East Indies.) 

 Periclimenes commensalis Borradaile. 

 P. pottsi Borradaile. 

 [P. cornutus, ceratophthcelmus, brocketti, Indian 



Ocean.] 



4Pontoniopsis comanthi Borradaile.] 

 Galathea elegans Adam and White (G. deflexi- 

 pons and longirostris are probably synonyms 

 of this species). 

 G. inflata sp. n. 

 G. minuta sp. n. 

 Cirolana lineata sp. n. 

 Cyclotelson gen. n. purpureum sp. n. 

 Amphiuridse. Ophiactis sp.? 

 Ophiotrichida:. Ophiomaza cacaotica Lyman. 

 Ophiomaza cacaotica var. picta Koehler. 

 [Ophiophthirius actinometra; Doderlein, 

 Torres Straits; Thursday Island. Ophioa> 

 tlu'ops unicolor Brock, Amboina. Ophio- 

 sphasra insignis Brock, Amboina. 



. Polynoe minuta Potts var. comanthi var. n. 

 [P. crinoidicola Potts, Indian Ocean.] 



DECAPODA MACRURA. 

 ALPHEID/E. 



The species of alpheids commensal with crinoids in Torres Straits 

 are two in number: 



Synalpheus brucei sp. n. from Comanthus annulatum and Comatula purpurea 



on the reef at Murray Island. 

 S. comatularum Haswell from Comanthus annulatum in shallow water from 



localities in Torres Straits (Albany Passage, Cape York, and north 



of Mabuiag). 



Coutiere has divided the species of this huge genus Synalpheus into 

 several groups, each consisting of nearly allied forms. In the Coma- 

 tularum group those species are included which fall in the following 

 diagnosis : 



"Supraorbital spines insignificant compared to the rostrum; antennules 

 shorter than the antennae; spines of the basicerite almost equal, the external 

 always smaller than the stylocerite; external maxillipeds oral, feebly spinous 

 distally; first segment of the carpus of the second pair of feet very long, 

 following feet cylindrical; ventral hook of the dactyl obsolete; telson with an 

 oval median lobe." 



