274 DISCOVERY REPORTS 



of C. smythii and C. callorhynchtis . The particulars for the specimens not seen by Norman are given 



separately : 



WS96 

 WS762B 



WS763 

 WS788 



16 

 2 



WS847B 

 WS853 



Specimens not seen by Norman : WS762B i male of 48 cm. ; WS763 unsexed specimens of 25, 30, 

 31 and 33 cm. and one unmeasured; WS788 unsexed specimens of 32 and 40 cm.; WS84JB one 

 female of 90+ cm. (tail damaged), weight 4750 g. 



SUMMARY OF OBSERVATIONS ON ELASMOBRANCHII 



The main features of the distributional trends of the various species- of elasmobranchs found on the 

 shelf are summarized in Tables 7 and 8. These show frequency of occurrence relative to the total 

 number of hauls made in each region, and abundance of individuals in each region relative to the 

 total for each species for all regions. With these and the data given in the Appendix any desired com- 

 putation as to fish per hour's trawling, or per hour's positive hauls, could also be made ; but as the 

 group is not sufficiently abundant to encourage commercial exploitation, I have not done so here. 



Table 7. Distribution of Elasmobranchii: occurrence in total of roughly comparable 



hauls in each region 



Table 8. Distribution of Elasmobranchii: regional abundance of individuals 



of the trawled species 



Species 



Squalus lebruni 



Raja flavirostris 



R. doello-juradoi 



R. macloviana 



R. magellanica 



R. scaphiops 



R. alburnaculata 



R. brachyurops 



R. griseocauda 



Psammobatis scobina 



Callorhynchus callorhynchus 



Total Elasmobranchii 



Total no. of 

 individuals 



39 

 68 



23 

 54 



7 



7 

 292* 



8 



iS7t 

 28 



697II 



Northern region 



No. 



3 

 10 



5 



4 

 I 



2 



o 



43 



2 



5 

 26 



77f 



/o 



37-5 

 25-6 



7-4' 



17-4 

 1-9 



28-6 



o 



14-7 



25-0 



3-2 



92-8 



ii-o 



Intermediate region 



No. 



I 

 18 



5 

 7 

 27 

 o 

 o 



53 

 2 



93 1 



/o 



211' 



* Includes eighteen southern specimens taken in 

 X Includes two taken in 'Other gear'. 

 II Includes six rare specimens not tabulated. 

 ** Includes four Discopyge tschudii not tabulated. 



12-5 

 46-2 



7-4 

 30-4 

 50-0 



o 



o 



i8-2 

 25-0 



59-2 

 3-6 



Southern region 



No. 



30-3 



Other 



4 

 II 



58 

 12 

 26 



5 



7 



196* 



4 

 59§ 



/o 



409tt 



50-0 

 28-2 

 85-2 

 52-2 

 48-1 

 71-4 

 1 00-0 

 67-1 

 50-0 



37-6 

 3-6 



587 



gear 



f Includes three taken in 'Other gear'. 

 § Includes one taken in 'Other gear', 

 f Includes one Psatnmobatis extenta not tabulated. 

 ft Includes one Raja multispinis not tabulated. 



