124 Proceedings of the Royal Irish Academy. 



General Distribution. — Well known from the Mediterranean. Taken by 

 the Travailleur and Talisman off the IST.-W. coast of Africa (342-820 fathoms) 

 and off Cape Verde Islands, by the Caudan in the Bay of Biscay (780 fathoms), 

 and by the Michael Bars ofi' the S.-W. coast of Ireland (504 fathoms) and off 

 (aibraltar (664 fathoms). 



Irish Distribution. — Taken by the Ilclfia, in twenty-two hauls between 

 300 and 600 fathoms off the W. and S.-W. coasts of Ireland. Certain range, 

 346-550 fathoms. 



In addition to the above, specimens of Trachyrhynchus were taken in 

 seven hauls made below 650 fathoms. Two specimens, put away for future 

 reference, fi-om S. E. 363, 673-720 fathoms, proved on examination to be 

 referable to Trachyrhynchus Murrayi. These specimens, along with four 

 others, were erroneously recorded, at the time of capture, as 7'. trachyrhynchus, 

 and it is probable that most, if not all, of the specimens taken below 660 

 fathoms should be referred to T. Mzirrayi. This view is supported by the 

 fact that there is a distinct gap in the vertical distribution of the genus 

 between 600 fathoms and 700 fathoms, nine hauls of the trawl having been 

 made wholly within those limits, in none of whicli was Trachyrhynchus 

 present. This is well seen in the diagram of vertical distribution given 

 above (p. 94). Particulars of the six hauls below 660 fathoms are given 

 under 2'. Murrayi. 



The average number of specimens of the genus Trachyrhynchus taken 

 per haul at various depths, estimated as explained above under M. rupestris, 

 were : — 



Depth 





Specimens per 



haiil. 



Number of hauls 



200-300 



fms. 













10 



300-400 







... 10-5 







15 



400-500 







... 2-0 







11 



500-600 







... 1.5 







21 



eoo-700 







•8 







13 



700-800 







... 5-6 







5 



