NAMES GIVEN WITH A PURPOSE 287 



tylus chiragra (Fabricius). The species appears to have 

 a vast range, and its colour is said to be exceedingly 

 variable. 



Coronida, Brooks, 1886, has the carapace flat and 

 nearly rectangular. The rostrum ends in a small median 

 spine ; the scale of the second antennas is very small ; the 

 terminal joint of the second maxillipeds is dilated at the 

 base, and armed with spines on the inner margin. The 

 pleon is depressed ; its hind segments and the telson 

 are thickly set with small spines. The uropods are very 

 small. The name of the genus is compounded from the 

 names of the rejected genera Coronis and Ohlorida (or 

 Chloridella\ to indicate Professor Brooks's view that like 

 them it contains somewhat primitive species. These are 

 Coronida Bradyi (A. Milne-Edwards) and Coronida trachii- 

 i'/is (Miers), both of which were originally assigned to 

 Gonodactylus. The professor seems inclined to suspect 

 that the sixth pleon-segment may prove to be fused with 

 the telson, but the type-specimens of Miers's species in the 

 British Museum show that at least in Coronida traclmrus 

 the telson is quite distinct from the preceding segment 

 and freely movable upon it. 



Protosquilla, Brooks, 1886, has the rostrum furnished 

 with long acute median and anterolateral spines ; the eyes 

 and the scale of the second antennae small ; the terminal 

 joint of the second maxillipeds' dilated at the base, with- 

 out marginal spines ; the pleon convex, its sixth segment 

 more or less completely fused with the telson ; the uropods 

 small. Professor Brooks considers the name of this genus 

 ' the more appropriate inasmuch as all the other Stomato- 

 pocla present evidences of divergent descent from a 

 common stem form, which, like the living representatives 

 of the genus Protosquilla, was characterised by the small 

 size of its eyes, anteunary scales, and uropods.' Seven 

 species are included in the genus, among which Proto- 

 squilla elongata, Brooks, with a carinate and bilobed but 

 otherwise simply constructed telson, presents a rather 

 striking contrast to Protosquilla Guerinii (White), in 

 which the dorsal surface of the telson carries twenty-two 



