BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY, 
Right, Left. 
Length OL frat armi ss- s s"es 40 36 
EHEN ON SCONTAT OQ y 6 voa 9 coa LOU 90 
KONE Or Vind ADS Y. 9 . à 45 i © 24 
MESSY Of LOUNA ar B a. o. 2s. M 08 26 
This form is sufficiently distinguished by the elongation of the second pair 
of arms. The disparity in length between the two arms of the third pair is 
noticeable, — the more so since that of the right side has a truncated extremity, 
as if it had been originally still longer. 
Famity POLYPODIDAE, n. n. 
Octopodidae Auctorum. 
POLYPUS. 
Polypus Schneider, (84, p. 116. 
Octopus Lamarck, ‘99, p. 18. 
Polypus Hoyle, :O1. 
I have elsewhere (: O1) shown that in accordance with the rules of zoölogi- 
cal nomenclature now generally adopted, Schneider’s name must take 
precedence of that proposed by Lamarck. It is no light matter to change a 
name that has been in daily use for just over a century, but I am so fully con- 
vinced that the only way of securing anything like uniformity in nomenclature 
is the rigid adherence to rules, that it seems to me best to make the change 
and trust to its gradual adoption. I notice that this view has been accepted 
by no less an authority than Mr. Edgar A. Smith, of the British Museum (: 02). 
11. Polypus occidentalis. 
Octopus vulgaris var. americanus d'Orbigny, ’53, p. 14, Plate 1, Fig. 1. 
Octopus occidentalis Hoyle, '86, p. 77. 
Habitat. — Charles Island, Galapagos Islands, April 1, 1801 ; one specimen 
9, No. 7943, [H, 39.] 
On my last visit to Copenhagen I had the satisfaction of comparing this 
specimen with Steenstrup's type, in company with my friend the late Dr. H. 
J. Posselt, whose untimely death in July, 1896, cut short à career of unusual 
promise. 
12. Polypus oculifer, sp. n. 
(Plate 4, Figs. 3, 4.) 
Habitat. — Charles Island, Galapagos Islands, March 31, 1891; one speci- 
men Q9, No, 7948. [H. 40.] 
