THE GENUS TOZEUMA 377 



The larvae of Latreutes and Tozeuma are known, and they have no resemblance 

 whatever to Eretmocaris. 



Bythocaris need not be considered, as it is said to have no free larva. Gelastocaris, 

 Lysmatella, Merguia are not known from the Atlantic; so that if the " Latreutid group" 

 is a reality we are confined in speculation to Trachycaris and Mimocaris. That seems to be 

 all that can be said. 



The remaining two species, A. VI and A. VII, cannot be even approximately placed. 

 The only character which A. VI has in common with Eretmocaris is the enormously long 

 eyestalk, and this is also peculiar in being jointed. Leg 5 is probably not enlarged. Until 

 something is known about its legs it is useless to speculate about its identity. 



Larva A. VII, again, has extreme elongation of the eyestalk, but here it is known that 

 leg 5 is not modified, and leg 4 has no exopod. Having regard to the characters of such 

 Hippolytid larvae as are known, I regard it as most improbable that either of these larvae 

 can be placed among the Hippolytidae at all, and the only suggestion that can be made is 

 that they may be Pandalids. In Chlorotocella^ there is great elongation of the eye, though 

 without distinction between eye and stalk, and I have referred to Pandalidae (1924, 

 p. 114) a larva which agrees with Pafidalus platyceros in having the abdominal and 

 carapace margins serrated, while the eyestalks are as much elongated as in some 

 Eretmocaris. 



This character alone cannot therefore be regarded as confined to the Latreutid group 

 of Hippolytidae, and the genus Eretmocaris is an ill-founded composite of unrelated 

 larvae. 



THE GENUS TOZEUMA STIMPSON 



I am indebted to Dr J. F. G. Wheeler for specimens of Tozeuma carolinense Kingsley 

 in stage I which were hatched at Bermuda Biological Station on 30 May 1936. For these 

 and other interesting specimens I would like to express my thanks to him. 



Stage I (Figs. 63-70). Length of rostrum 0-9 mm. ; body 3-0 mm.; total length 

 3-9 mm. 



Rostrum nearly twice as long as antennule, without teeth, rather deep, parallel-sided 

 in side view as far as distal third where the lower margin slopes sharply upwards to end 

 in an acute point. Carapace without supra-orbital spines; margin smooth, with small 

 pterygostomial spines. 



Abdominal somite 3 with large pointed dorsal process, curving slightly forwards; 

 somite 5 elongated, with a pair of large lateral spines. Telson concave behind, the spines 

 all of about the same length. 



Antennule with very short feathered seta and four aesthetes on exopod. Of the 

 aesthetes three are long and blunt-ended, one much stouter than the other two, and 

 one is much shorter and pointed, apparently without the membrane seen in Eretmocaris 

 R.S. I. 



^ Material from Ghardaqa, not yet published. 



4-2 



