44 DR. J. MURIE ON IRREGULARITY [Jan. 13, 
Kulder (a rocky mountain-stream joining the river Tyne, in North- 
umberland), with the testicles fully developed. 
Column IV. to a Sewin, or Bull Trout (S. cambricus) from the 
Rhymney. A male in the Smolt state, before going down the 
sea. 
Column V. gives the admeasurements of one of the so-called 
hybrids between the Sewin (8. cambricus) and the River-trout (S. 
fario). ‘A young female from the Towey, caught in the month 
of August.” 
Column VI. gives those of a male specimen of the S. nigripinnis, 
with testicles well developed. “From Llyn Gadr, caught in the 
month of August.” 
Column VII. gives those of a perfect-conditioned male Salmon 
from the river Tweed. 














TABLE B. 
I. Il. Ill. Iv. v. VI. vil. 
iS} ) ao | gms ier) acd 
B Ole ol EY ee | a | ee ee 
@ O19 .o/ Sl agiga| Sa] sa 
STAiST A] Se | Qe | ee | Se] SH 
se adbeast cht BC BSc 
eae a) ga | 28 | "2 | Se | ae 
NIN == P= = Wel R= fib pe y= 
in. in. in. in. in. in. in. 
Motallengeth vec. ccteeseessdeces 65 | 76 | 65 | 687 | 7:50] 8:00 | 46:0 
Greatest depth of body ...... ee 1:2 1-43 | 1:37 | 1:50 | 1:62 | 11:50 
Length of the head ............ 14 1:2 1:57 | 1:43 | 1:56 |) 1°75 | 10°50 
Least depth of tail ............ se 0:6 0:56 | 0°56 | 062 | O75 | 3:33 
Distance from end of snout to 
BV.Oeb ae tlesyoee.aheee enn 03 | 0-45 | 0:37 | 0°37 | 0°37 | 0:37 | 450 
Length of maxillary bone...... 06 | 0°75 | 0-43 | 056 | 062) 0°75 | 3:75 
Distance between eye and prx- 
opercular angle............... 05 | 037 | 0:50 | 0:50 | 0:62] 3:33 
Greatest width of operculum.. 0-4 | 0:37 | 0:37 | 037 | 037 | 2:12 
Greatest depth of operculum.. 075 | 0-43 | 0:50 | 050} 056} 30 
Distance between occiput and 
origin of dorsal fin ......... 1:75 | 1:62] 1:87 | 1°75 | 1:87 | 14:0 
Distance between end of dorsal 
and root of caudal fin ...... ... | 240} 2:06 | 2:31 | 25 | 2:87 | 15:0 
Length, base of dorsal ,.,......} 0-9 0-85 | 0:75 | 0°75 | 0°75 | O87 | 466 
Greatest height of dorsal ......!_ 1-2 ee 087 | O81 | 1:00} 1:12] 450 
Length of pectoral ............ 1:2 13 | 1:25 | 1:00} 1:25) 1:37) 5:50 
Distance between roots of pec- 
toral and ventral ............ 16 1:8 1:62 | 1:87 | 2:00 | 2:00 | 12:5 
Length of ventral fin ....,.... 09 | 0-87 | 0-75 | 087 | 112) 466 
Distance between root of ven- 
tral and origin of anal...... 1:2 | 1:15) 10 | 1:00] 137] 1:37 | 105 
Length of the anal ............ 08 | O8 | 056} 0-43] 056 | 062] 3:33 
Length of longest caudal ray.. isi 1:06 | 0:87 | 1:12 | 1:25 6:00 
Length of middle caudal ray.. 0°55 | 0°43 | 0°56 | 056 | 062 


Between the Society’s two specimens there is a close agreement, 
the head of No. 1, however, being proportionally and absolutely the 
longest. The Parr (III.) corresponds to both, the main disagree- 
