Fauna Associated with Crinoids of Tropical Coral Reef, etc. 87 



which the last is the smallest) and the absence of spinulae on the gastric 

 region. They differ from multilineata in having a shorter rostrum and 

 longer spines and in the far less marked sculpturing on the carapace. 



Galathea minuta sp. n. (Plate 1, Fig. 6.) 



A very small galatheid, with short and broad rostrum, 3 sharp spines on 

 each side; gastric region without spines, carapace with few hairs, traversed by 

 about 12 shallow transverse grooves; chelae short; merus of third maxilliped 

 with 2 strong spines internally, one externally. 



From Comanthus annulatum, obtained in about 4 fathoms of water off 

 Mabuiag Island, Torres Straits, Australia. 



Measurements : Length of cephalothorax to tip of rostrum 4.5 mm. Length 

 of chela 6.2 mm., of propodite 2.7 mm. Breadth of cephalothorax 3 mm. 

 Length of carpopodite 1.0 mm., of meropodite 2.5 cm. 



The carapace is of fairly uniform breadth, narrowing slightly and gradually 

 anteriorly. Its surface is smooth, traversed by only about 12 shallow grooves, 

 in which lie scanty rows of short hairs. There are no spines on the gastric 

 region, but prominent spines (8 in number) exist at the end of the transverse 

 grooves. 



The rostrum is rather short and broad. The central spine is very strong 

 and elongated and on each side of it are 3 prominent spines with their bases 

 close together and advanced, also strong and elongated. The surface is smooth. 



The basal joint of the first antenna carries 3 anteriorly directed spines; the 

 dorsal one is long, the two ventral smaller and more slender. 



The merus of the third maxilliped carries 2 large spines internally and one, 

 rather shorter, externally followed by small spinulae. The teeth on the internal 

 border of the ischiopodite are comparatively few and strong. 



Abdomen with two transverse lines to each segment. 



Chelae short, about half as long again as the cephalothorax, beset with long, 

 coarse, scattered hairs and strong spines on the propodite, carpopodite, and 

 meropodite, especially the carpopodite. Dactylopodite little more than a third 

 of the propodite in length. 



Merus of ambulatory legs beset on upper angle with about 10 spines, very 

 small proximally, prominent distally. Dactylopodite with strong end claw 

 and one prominent spine succeeded by minute processes. 



Colouration: Alternate longitudinal stripes of white and dark blue, as 

 shown in plate, of about equal breadth. On a light-coloured individual of 

 Comanthus annulatum. 



AMPHIPODA. 



A tiny amphipod which occurred very often on the darker crinoids is 

 apparently to be referred to the family Amphilochidce, a new genus of 

 which must be established for its reception. 



CYCLOTELSON gen. n. 



Rostrum curved, acuminate, lateral angles of head rounded. Side plate 1 

 not much smaller than 2, rounded, obscured by those succeeding it; 2 to 4 

 large and deep, 2 and 3 rounded, 4 largest, quadrangular shape (also 5) as in 

 Amphilochus. Antenna 1 very short and stout, flagellum particularly so. 

 No accessory flagellum, upper lip bilobed, lower lip with small inner lobes. 

 Mandible with very narrow denticulate cutting edge, molar process absent, 

 third joint of palp very long. Maxilla 1, inner plate absent, outer plate with 

 8 or 9 spines, the proximal much the largest and forming dentate process 



