30 PIIYI.I.OPOD CRUSTACEA 



present, and usually a persistent median eye. Five to 19 (in living forms) pairs of trunk 

 limbs, which are simple foliaceous, modified foliaceous, or (rarely) pediform. Two pairs 

 of antennae and 2 pairs of maxillae present, the 1st antennae and 2nd maxillae usually much 

 reduced. 



Order PHYLLOPODA (Euphyllopoda) 



Branchiopoda with 10 or more pairs of trunk limbs all simple foliaceous, or with the 

 anterior 1 or 2 pairs somewhat modified for clasping the 2 or as tactile organs. Develop- 

 ment (with the single exception of Cydcstheria liislopi) always with a metamorphosis from 

 a free-swimming nauplius or metanauplius stage. The heart has several pairs of ostia. 



Suborder I ANOSTRACA 



Phyllopoda with an elongate body and without carapace. With 11 to 19 pairs of simple 

 foliaceous trunk limbs. Paired pedunculate compound eyes, a median ocellus in front. First 

 antennae small, 2nd antennae large and modified for clasping in $ . Fight or 9 post- 

 pedigerous (abdominal) segments, the first 2 of which bear the external genital organs and 

 may be partly fused. Caudal furca when present never segmented. Paired eversible penes 

 in $ ; ovisac formed by united oviducts in 9 in which ova are retained. Young hatch as 

 nauplii or metanauplii. (In this group the rami of the caudal furca are usually known as 

 ccrcopods.) 



Key to flic Faiiiilirs and Genera of Anostraca of the Indian Empire 



1. 2nd antennae oi S biarliculate 



A. Basal joints f)f 2n(l antennae of <? nearly or entirelx' se])arate 



i. Basal joint of 2nd antennae of $ with no ])rocesses, or with small 



and simple ones only Ikj iimiipah 



a. Distal joint of 2nd antennae of $ greatly flattened Irtciiiia 



b. Distal joint of 2nd antennae of $ not greatly flattened Branchinecta 



ii. Basal joints of 2nd antennae of S bearing 1 or more consiiicuous 



fleshy processes Chirocephai.wae 



a. (only Indian genus) Pristieephalus 



B. Basal joints of 2nd anteimae of $ firmly joined to each other and to 



the front of the head to form a clypeus Braxchifodidae 



i. Front of head of S bearing 2 long filiform processes which are 



connate at base Brancliipiis 



ii. Front of head of i without filiform processes Branehipodopsis 



2. 2nd antennae of $ triarticulate, cheliform Streptocephai.idae 



A. (only genus) Sfreploeephaius 



