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.] 
Synalpheus comatularum Haswell, S. brucei sp. n. 
(S. stimpsonii var. maldivensis, Indian Ocean. 
S. carinatus var. binongeensis, East Indies.) 
Periclimenes commensalis Borradaile. 
[P. pottsi Borradaile. 
Pontoniide........ [P. cornutus, ceratophthoelmus, brocketti, Indian 
Ocean.] 
({Pontoniopsis comanthi Borradaile.] 
Galathea elegans Adam and White (G. deflexi- 
pons and longirostris are probably synonyms 
Decapoda Anomura. of this species). 
( 
Decapoda Macrura 
Alpheide. 
CRUSTACEA ...... 
G. inflata sp. n. 
G. minuta sp. n. 
fsopota resi Maha seeslt Cirolana lineata sp. n. 
Amphipoda........... Cyclotelson gen. n. purpureum sp. n. 
Amphiuride. Ophiactis sp.? 
Ophiotrichide. Ophiomaza cacaotica Lyman. 
Ophiomaza cacaotica var. picta Koehler. 
EcHINODERMATA. Opbiuroidea......... j [Ophiophthirius actinometre Déderlein, 
| Torres Straits; Thursday Island. Ophioz- 
| thiops unicolor Brock, Amboina. Ophio- 
| sphera insignis Brock, Amboina. 
(Polyehstar: 02.00 0.2. Polynoé minuta Potts var. comanthi var. n. 
ANNELIDA........ | [P. crinoidicola Potts, Indian Ocean.] 
Myzostomida. 
MOLLUSCA........ Gasteropoda. 
DECAPODA MACRURA. 
ALPHEID-. 
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). 
Coutiére 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 antenne; 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.” 
