1863.] ON NEW AUSTRALIAN CRUSTACEA. 501 



and furnished upon each side of the central line with a small tuft of 

 hair, from which circumstance the specific name is derived. The 

 eyes are large and prominent. The superior anteun£B have the pri- 

 mary appendage but half the length of the secondary, The inferior 

 antennae have the squamiform appendage reaching quite to the ex- 

 tremity of the rostrum, rounded at the apex, and furnished with a 

 sharp tooth one-third from the extremity, and have the flagellum 

 more than half the length of the animal. The mandible is furnished 

 with a short, fixed, small, anteriorly directed process. The first pair 

 of pereiopoda are short, robust, and have the propodos long ovate, 

 narrowing slightly towards the dactylos, and articulating upon the 

 inferior process of the deeply concave anterior margin of the carpus. 

 The second pair of pereiopoda are longer and more slender than the 

 preceding, and have the propodos not larger than the carpus. Pos- 

 terior pair of pleopoda rather longer than the telson. Telson termi- 

 nating in two or three small spines. 



This species was taken with the preceding, with which it generally 

 agrees in structure, except in the formation of the mandible, which 

 in this specimen has a small anteriorly directed process. This addi- 

 tion, being one of structure, I consider to be sufficiently important to 

 distinguish the present species generically from that of the preceding; 

 but since Milne-Edwards, in his character of the genus Caradina, 

 has not described the form of the mandible, it is difficult, until an 

 opportunity offers of examining a specimen of the original species of 

 the genus, to determine which of the two forms of mandible belongs 

 to the type. I have therefore thought it desirable to classify them 

 under Divisions A and B, rather than make a new genus, which must, 

 under the circumstances, be equivocal. Division B approximates in 

 the character of the mandible more nearly to that of the genus Hip- 

 liolyte than Division A. 



This description is taken from a female specimen loaded with ova; 

 and if we may judge from the majority of specimens in the small 

 collection being so furnished, we should imagine the month of April, 

 in which they were taken, to be a favourable period for their pro- 

 duction. 



The colour of this species has not been recorded from the living 

 animal. In its preserved state it is yellowish, blushed with red 

 along the dorsal surface and primce vies. It was taken, with the pre- 

 vious specimen, in Gulf St. Vincent. 



Caradina tenuirostris. (PI. XL. fig. 4.) 



C. rostro supra dentibus tribus apud basim et infra uno dente 

 apud apicem armato. 



In this species the rostrum is long, slender, and armed with three 

 teeth upon the upper surface near the base, and one upon the under 

 surface near the apex. The pleon is gibbous at the third segment, 

 being slightly produced posteriorly, and dorsally compressed. The 

 eyes are large and prominent, having the peduncle quite half the 

 length of the rostrum. The superior antennae are one-third longer 



