368 THE REV. T. R. R. STEBBING ON 
1906. Zalorchestia scutigerula Stebbing, Das Tierreich, vol. xxi. 
p. 544. 
1912. r 5 Chilton, Tr. Roy. Soc. Edinb. 
vol. xlviil. p. 508. 
Mr. Vallentin reports this species as very common along the 
shore at Stanley Harbour, Nov. 20, 1898, and he obtained 
numbers of smaller specimens from cast up Macrocystis on 
March 21, 1902. One of the largest of these latter measured 
13°5 mm. in length, and is in good correspondence with Dana’s 
figure from a Tierra del Fuego specimen. But a larger specimen 
from Mr. Vallentin’s earlier find measured 15 mm., and agrees 
with Bate’s figure, showing the shield at the back of the second 
joint of the fifth pereeopod rising above the animal’s back, over 
which the two bucklers meet. ‘The difference in appearance 
between the two forms is very considerable, but further com- 
parison shows that it is due to the maturing of the single feature 
to which it is confined. 
Gen. Hyaewua S. I. Smith. 
1874. Hyalella 8. I. Smith, Rep. U.S. Fish Comm. vol. ii. p. 645. 
1906. 94 Stebbing, Das ‘Tierreich, vol. xxi. p. 574. 
1907. ais Weckel, Pr. U.S. Mus. vol. xxxu. p. 54. 
1906. re Chevreux, Lacs des hauts plat. d’Amer. du Sud, 
p- | (extrait, 1907). 
1910. oa Weckel, Pr. U.S. Mus. vol. xxxviil. p. 623. 
1911. s4 Ortmann, Princeton Univ. Exp. Patagonia, vol. 111. 
p. 650. 
HYALELLA PATAGONICUS (Cunningham) Ortmann. 
1871. Allorchestes patagonicus Cunningham, Tr. Linn. Soe. 
London, vol. xvii. p. 498, pl. 59. fig. 4. 
1888. Hyalella patagonicus Stebbing, Rep. Voy. ‘Challenger,’ 
vol, xxix. p. 404. 
1911. Hyalella patagonico Ortmann, Princeton Univ. Exp. 
Patagonia, vol. iii. p. 650, pl. 48. fig. 3 ah. 
If the above identification could be proved to be erroneous by 
comparison with Cunningham’s original specimen, a change in the 
recent specific name would become necessary on the ground of 
preoccupation. As it stands the species has been amply described 
as new by Dr. Ortmann, who also mentions its near relationship 
to other species of the genus. In our specimens the sixth joint 
of the fifth pereeopod is relatively longer than in Ortmann’s 
figure, and the third uropods agree not with his figure, but with 
his text. Mr. Vallentin reports the “ colour when alive very dark 
brown, almost black.” 
Localities. ‘‘In sand ground near old house, Port North, 
10 Aug., 1910.” Along with it were numerous specimens of the 
little Copepod Boeckella michaelseni (Mrazek), of which Dr. Thomas 
Scott, F.L.S., reports in the Ann. Nat. Hist. ser. 8, vol. viii. 
p. 3, 1914, “This species occurred in at least eight gatherings ” 
