DISTRIBUTION AND GENERAL NOTES ON THE SPECIES 327 



came from the Golfo san Jorge it is evident that it occasionally penetrates southward to the area 

 of the trawling surveys. Norman (1937, p. 65) points out that it may prove to be identical with 

 B. chilensis Regan, from the west coast, when comparison of specimens of similar size is possible. 



NOTOTHENIIDAE 



Notothenia macrophthalma Norman. The holotype of this new species was trawled in deep water 

 (368-463 m.) at St. WS840, near the Burdwood Bank. Norman (1937, p. 68) states that it is very 

 closely related to N. squamifrons Giinther, from Kerguelen. Unfortunately no other specimens have 



been secured. 



Notothenia trigramma Regan. We did not capture any examples of this distinctive species, known 

 only from the holotype from Port Stanley in the Bruce collection (Norman, 1937, p. 69). 



Notothenia canina Smitt. This small coastal species showed a very restricted distribution in our 



catches, being taken only near the eastern entrance to the Magellan Straits, and in Grande Bay. All 



the records come within our southern region, and it is noteworthy that the types also are from Puerto 



Gallegos in Grande Bay (Norman, 1937, p. 70). Norman also states that some specimens from Tierra 



del Fuego, undoubtedly referable to this species, were wrongly attributed to N. acuta Gunther by 



Steindachner. Our records of N. canina are : 



WS8Q 2 WS834 8 WS847A I WS835 45(BTS) 



WS833 18 WS837 I WS812 7 WS836 4(BTS) 



All but the first of these were obtained in late summer, so that it is perhaps permissible to take some 

 note of the pooled measurements. The species is a small one, these scanty data showing a mean 

 length of lo-i cm. with ohjN^o-iogg. A well-defined mode at 10-5 cm. may indicate the I-group 

 year class. The range of sizes observed was post-larvae (< 5 cm.) up to 19 cm. (see Fig. 36). 



The depth relations of this species are extremely interesting: although taken in shallow coastal 

 waters, it did not seem to come quite so far inshore as the extreme littoral members of the group, 

 and the range was very restricted. A single specimen was taken at a depth of 100 m., but the other 

 records were grouped so closely around the effective mean depth of 26 m. that that figure is signifi- 

 cantly different from the mean depths recorded for all the other species of nototheniiformes withm 

 our area (Fig. 42 and Table 36). Fig. 3 shows that the slope from the coast down to 80 or 100 m., 

 where the plain of the shelf may be said to begin, is steep in the north, and though more moderately 

 inclined in the south it still shows a far more obvious gradient than is to be found on the plam itself. 

 It would seem that N. canina is confined to this ' first slope', and mainly to the upper portion thereof. 

 It is further noteworthy that the species is not known from the other side of the deep water of the 

 Falkland trough. None has as yet been recorded from the Falkland Islands. The probable ecological 

 significance of this depth distribution becomes apparent when we come to consider the depth relations 

 of the two species next to be discussed. 



Notothenia jordani Thompson. In our catches this species was even more closely restricted to a 

 southern area off the eastern entrance to Magellan Straits than was A^. canina. Some of Thompson s 

 types, however, came from farther north, in the Golfo san Jorge. He found them most abundantly 

 in the same place as we did, off Cape Virgins, and also within the eastern end of the Straits themselves 

 as far as the first narrows. It will be noted that we did not find the species very plentiful; forty-three 

 in the small beam trawl was the only large catch : 



WS90 2 WS834 14 



WS833 9 WS836 43 (in BTS) 



N. jordani is a small species, the mean length of our specimens being 13-8 cm. with (t1,/N= 0-2386. 



