92 Wisconsin Academy of Sciences, Arts, and Letters. 



FAMILY 3. LYNCEIDJE. 



Sulb-lamily 1. Eurycercinte. 



• Sole genus and species. 

 EuRYCERCUS Lamellatus. 0. F. Mliller. 



For the synonymy of this species, see P. E. Mlilier, 1. c. p. 162. 

 Fischer's L. laticaudatus is the only instance where the animal 

 has been described under a specific name different from Miiller's. 



I wish to note only a few points in the anatomy of this species. 

 The ventral margin of the valves is set with short, stout, movable 

 spines. These bear near near the base a row of backward pro- 

 jecting hairs. The antennules have a crown of long teeth around 

 the apex, from within which rise the sense-hairs. On the basal 

 joint of the antennte, about the middle of its hinder side, is a 

 large tubercle, covered with short, stout, black spines. The an- 

 terior margin of the valves is strongly convex, and the lower 

 loop of the shell-gland is prolonged into the convexity, thus mak- 

 ing an open loop, whose long axis is parallel to that of the body. 

 Leydig's figure of the animal is quite incorrect in this particular, 

 and indeed, his figures in general, so excellent in other respects, 

 are little to be trusted in this. His figure of the legs of this spe- 

 cies is very accurate. 



Sub-family Lyiiceinase. 



GENUS 1. 



Pleuroxus. p. E. Miiller, 1868. 

 Ltncetts. e. p. autorum. 

 Pleuroxus et Pekacantha. Baird. 



" " ET Rhypophilus. Schodler. 



" Sars. Kurz. 



SPECIES 1. 

 Plate I. Figs. 19-20. 



Pleuroxus Procurvus. sp. no v. 



Length, 0.5 mm. 

 Eostrum bent forward and upward at tip. Hinder margin and 

 anterior margin armed with teeth. Yalves striate around edges. 



