Turner, Ahi-vous System of Cypris. 23 



cypris appears much concentrated. It consists of an infra-oeso- 

 phageal ganglion, with nerves to the jaws and maxiUipeds, and 

 a small ventral ganglion. Out of the latter arise two pairs of 

 nerves, which jjrobably innervate the musculature of the limbs 

 and the abdomen. 



Finally comes Wenzel Vavra who, in his late work (i i), has 

 devoted three pages to the discussion of the nervous system of 

 the Ostracoda. In that work he makes the following statements: 

 1st, the central nervous system consists of a brain and a five- 

 ganglionic ventral chain ; 2nd, the optic and antennulary nerves 

 arise in the brain, but the antennary nerve arises in the pharyn- 

 geal collar ; 3rd, in the five-ganglionic ventral chain which extends 

 to the genital apparatus, the anterior three ganglia are closely 

 approximated ; 4th, from each ganglion a nerve passes to a pair 

 of limbs and from the last ganglion a nerve passes to the genit- 

 al apparatus ; 5th, what Dr. Claus says about the structure of the 

 eye is correct ; 6th, in Cypria and Cyclocypris the eye is large 

 and the pigment black, in Camiona the eye is inconspicuous and 

 the pigment reddish ; 7th, in Typhlocypris, although the eye of 

 the embryo is pigmented yet the eye of the adult is a degener- 

 ated, non-pigmented, sense organ ; 8th, in Noiodrovias the three 

 e3'es are separated, but each of the paired eyes is connected, by 

 means of a stalk, with the median eye, and each of these three 

 large eyes receives a distinct nerve from the brain ; 9th, the 

 sensory seta of the second antenna, which is longest in Typhlo- 

 cypris, Candonopsis dnd Cyclocypris, is an olfactory organ ; loth, 

 the " blasse kolben " on the last segment of both the anten- 

 nules and antennae are composed of two segments; iith, on 

 the fifth segment of the antenna of male and female specimens of 

 Notodrouias there occurs a special sensory seta ; 12th, in Can- 

 dona, Candonopsis, and Cypria the distal extremity of the 

 fourth segment of the male antennae bears a characteristic seta. 



TECHNIQUE. 



For hardening and fixing Ostracodcs alcoholic picro-sul- 



