1863.] ON NEW AUSTRALIAN CRUSTACEA. 499 



long peduncle. The superior antenna is short, the extremity of the 

 flagella reaching scarcely more than half the length of the rostrum, 

 and scarcely longer than the peduncle, the first joint of which is 

 armed with a tooth as long as the joint. The inferior antenna has 

 the squamiform appendage reaching nearly to the extremity of the 

 rostrum, and the flagellum reaching more than the length of the 

 rostrum beyond it. The mandible differs from that of Sippolyte 

 in the absence of the small secondary appendages, and in having the 

 molar surface more denticulated and less furnished with hairs. The 

 second pair of gnathopoda are flat or spatuliform, fringed at the apex 

 with eight or nine robust teeth. The first pair of pereiopoda are 

 short, robust, and chelate, having the propodos longer than the carpus. 

 The second pair are long, slender, and chelate, having the propodos 

 shorter than the carpus. The remaining three pairs of pereiopoda 

 are shorter than the second, and slightly more robust, and terminate 

 in simple unguiculate dactyli ; the inner surface of the carpi and 

 propodi are armed with spines, those on the carpi being all equally 

 long and strong, while those on the propodi gradually increase in 

 length towards the distal extremity. The pleon has the lateral walls 

 of the first five segments deeply produced, those of the fifth being 

 quite as deep again as the body. The posterior pair of pleopoda are 

 rather longer than the telson, and fringed with cilia, except upon the 

 outer margin of the outer ramus. Telson longer than the last seg- 

 ment of the pleon, terminating in an obtuse point, and armed near 

 the central and terminal margins with two pairs of short spines. 



Mr. Angas, who took this very beautifully coloured species, de- 

 scribes it as of a " rich green, between apple and malachite, darker 

 on the back, chrome-yellow and gamboge nose and lines along the 

 back, then cobalt-blue, the rostrum being tipped with crimson. 

 The eye-like spots upon the sides and back rivalled in brilliancy 

 those of the peacock's tail ; the centre was filled with intense pea- 

 cock-blue and green, surrounded by a black ring, then one of crim- 

 son-scarlet, the side of each segment being coloured with exqixisite 

 purple that shades into a more or less rosy violet, the telson and 

 posterior pair of pleopoda being crimson." Unfortunately it is diffi- 

 cult to retain colour in Crustacea ; consequently all this brilliancy of 

 tinting disappeared in about twelve hours. Three specimens of this 

 species were dredged by Mr. Angas in St. Vincent's Gulf, in April 

 1861, four miles from the shore, on a weedy bottom, in 4j fathoms 

 of water. 



The description is taken from the largest specimen. The other 

 two differ from the type, not only in size, being smaller, but also in 

 the depth of the lateral walls of the fifth segment of the pleon. 



Genus Caradina, Edwards. 



Division A. Without second appendage or process to the mandible. 



Caradina truncifrons. (PI. XL. fig. 2.) 



C. rostro tarn alto quam cephalon, margine anteriore truncato et 



serrato, margine dorsali uno dente instructo. 

 Length f ths of an inch. 



