CANADIAX FISHERIES KXPEDITIoy, 191'rlo 



203 



16. Lahidocera aestiva Wheeler. — The capture of this species, which is very abun- 

 dant in the summer at Woods Hole, at Princess station 28 is worthy of special mention. 

 It is ^ven as a generic character of Lahidocera that there is no rostral lens, while the 

 dorsal lenses are larger in the male than in the female. In the material examined by 

 me the male measures 2mm. in length, the female 2- 5mm. The dorsal lenses of the 

 male are larger than those of the female and are contiguous; but in addition to the 

 dorsal lenses a rostral lens is present and clearly seen in ventral view. It will be a 

 simple matter to control this identification by re-examination of examples at Woods 

 Hole. 



Fig. 28. — Labidoccra aestiva, female. Ventral view of head from a compressed 

 preparation show insr dorsal and rostral lenses. Freeh *nd. "Princess" 

 station 28, 20-0 metres, August 3, 191 o. 



6551— 17i 



