1. '08. 



96 



The Irish specimens with perfect rostra yield the following 

 measurements : — 



Sex. 



Lengthof 

 body.' 



Length of 

 rostrum. 



Ratio of 

 rostrum to 

 body (100). 



$ 



108 



61 



56 



? 



106 



63 



59 



$ 



105 



65 



62 



$ 



98 



62 



63 



^ 



96 



58 



60 



cJ 



94 



48 



51 



(? 



92 



58 



63 



$ 



89 



57 



64 



cJ 



89 



54 



60 



^ 



79 



53 



57 



(? 



73 



49 



67 



Senna's measurements (1903) of seven specimens from the 

 Mediterranean show that the rostrum varies from 45 per cent, 

 to 58 per cent, of the length of the body, as compared with 

 51 per cent, to 67 per cent, in the case of the Irish examples. 



General distribution. — First taken by the Travailleur in 

 the East Atlantic (exact locality not published) and also 

 known from the Mediterranean (Adensamer, Senna, etc.), 

 from the Spanish coast (Wolfenden, Silver Belle, 1906) 

 and from the Bay of Biscay (Caullery). Found by the Chal- 

 lenger between the Philippines and Borneo, off Sydney Har- 

 bour, off the Kermadec Is. and near Fiji (Spence Bate, sub 

 P. semilaevis). P. martia has also been taken by the In- 

 vestigator in the Arabian Sea, Andaman Sea, Bay of Bengal 

 and off Ceylon (Alcock) and is reported as common in the 

 neighbourhood of the Sandwich Islands (Eathbun). 



Irish distribution. — The slender rostrum is broken in the 

 majority of the specimens obtained ; the measurements in the 

 following list are therefore given from the back of the orbit 

 to the apex of the telson. 



Helga. 



S.R. 171— 5/11 /'04.— 52° T N., 11° 58' W. 337 fathoms. Trawl 

 — One, 66 mm. 



S.R. 188— 3/2 /'05.— 51° 53' N., 11° 59' W. 320-372 fathoms. 

 Trawl. Temperature at 300 fathoms 10T2° C, saUnity 

 35 •507^0— Ten, 84r-97 mm. 



S.R. 353— 6/8 /'06.— 50° 38' N., 11° 32' W. 250-542 fathoms. 

 Trawl. Temperature at 500 fathoms 8 -58° C, salinity 

 35-46°/ — Four, 97-110 mm. (two ovigerous females). 



1 Measured from the back of the orbit to the apex of the telson. 



