ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 241 



and G. tridens) ; OropJiorhynchus has as new species aries, spinosus, 

 Sharreri, nitidus, and spinoculatus ; Elasmonotus, E. longimanus and 

 E. hrevimaniis, E. armatus and E. dbdominalis. The new genus 

 Diptychus has the general form of a Galathcea : D. nitidus, D. uncifer, 

 D. armatus, D. rugosus, and D. inter medius. PtycJiogaster (P. spinifer). 

 Among the Scyllarids the only new genus is Palinustus (P. trun- 

 catus). Want of space altogether prevents our giving the names of 

 the numerous new species which belong to generic forms already 

 described ; and, indeed, space must still be kept, for we have not yet 

 in hand the whole of even the preliminary account of this really 

 marvellous collection of Crustacea. 



Sensory Rods of First Pair of Antennae in Crustacea.* — In the 

 Podophthalmia, S. Jourdain finds that these consist of slender 

 cylindrical hairs, each covered by a delicate chitinous layer, and 

 divided into a variable number of joints ; the free end has the form of 

 a truncate cone, and bears a hyaline process, which probably has a 

 sensory function ; within the sheath is a granular substance, derived, 

 apparently, from the dermal layer or chorion ; a nervous fibril has 

 been traced to the base of the hair. These rods are variously dis- 

 tributed in the different groups, but they agree in the fact that when 

 the antenna is branched they occur on one only of the branches. In 

 the Brachyura, this principal branch is short, and on one side of it 

 are arranged the rods in transverse rows, which diminish in breadth 

 towards the apex of the antennae, which is bare of them, as are also the 

 first three or four joints at the base ; the branch has thus the form of 

 a brush, and the different rows of rods move to or from each other 

 with the movements of the antennal joints ; in life it is always 

 in motion, dashing abruptly through the water ; alimentary particles 

 entangled in it are removed by the palps of the second pair of 

 maxillipedes. The antenna is very sensitive to external im- 

 pressions. 



In the Anomoura the essential characters of the antennal brush 

 are those which prevail in the Maerura. In the latter the antenna is 

 not retractile into a cavity, and its movements, though abrupt, are far 

 less frequent than in the Brachyura ; the principal branch beai's the 

 sensory rods, generally in double rows, on the basal joints alone ; the 

 number of rods in each row is small. 



In the Oligognatha {Hedriophthalmia) the structure of the rods 

 is essentially the same as in the foregoing groups, but their arrange- 

 ment shows an immense number of variations ; as a rule, the antenna 

 in question (antennide) has no special movements, and the number of 

 rods is not great. The function of the rods must be admitted to be 

 sensory, but thei-e is nothing in their structure to prove them to be 

 specially devoted to the sense of smell. 



Australian and Tasmanian Amphipods-f— Mr. W. A. Haswell 



records 12 new species of Amphipods, with a new genus Aspidophoreia. 



* Comptes Eendus, xci. (1880) pp. 1091-3. 



t Troc. Limi. Soc. N. S. Wales, v. (18S0)^>p. <)7-105 (3 pis.). 



