HYALONEMA (HYALONEMA) AGASSIZI. 199 
of the distal rays, together with the spines, of the gastral cone-pinules, h, the 
diameter of the microhexactines, 7, the length of the large macramphidises, and 
k, the length of the small micramphidises. The following table, arranged in 
pairs, shows which of these qualities the forms A to F have in common. 
4656 (A) and 4651 (B) 4 aegh 
i “4740 (C) 4 cefk 
g o “3684 (A.A. 17) (D) 1 g 
= : “4742 cake-sh. (E) g 4 eghi 
= se “* 4742 pear-sh. (F) = i abdeghk 
g 4651 (B) and 4740 (C) = 4 bdei 
£ i 3684 (A.A. 17) (D) 8 5 8 bedgk 
ee ie ake! “4742 cake-sh. (E) | @ 6 z= bedegh 
g | " “4742 pear-sh. (F) 2 5 = acegh 
ion|) 4740 (C) and 3684 (A.A. 17) (D) et 3 abd 
a a “4742 cake-sh. (E) a 4 abde 
& a “ 4742 pear-sh. (F) | 3 1 e 
HH 3684 (A.A. 17) (D) and 4742 cake-sh. (E) 5 abcdg 
“4742 pear-sh. (F) 4 egik 
4742 cake-sh. (EL) and 4742 pear-sh. (F) 4 cegh 
These affinities are shown in Figure 8. 
Of the five stations where these sponges were trawled, two, Stations 4651 
and 4656, lie near together off the Peruvian coast. The other three, Stations 
4740, 4742, and 3684 (A.A. 17), are a considerable distance apart in the central 
Pacific and are far from the two Peruvian stations. The degree of similarity 
of the specimens separated as the six kinds of Hyalonema agassizi stands in no 
relation to the distances of their localities from each other. Thus the cake- and 
the pear-shaped specimens from Station 4742 agree only in respect to four of the 
ten qualities, and the pair from Stations 4651 and 4656, which he very near 
each other, also agree only in respect to four qualities. The pairs which agree 
most are the pear-shaped specimens from Stations 4656 and 4742, which agree 
as to seven qualities, and the cake-shaped specimens from Stations 4651 and 
4742, which agree in respect to six. The units of the pairs of stations from which 
these come are very far apart. 
These and the other differences between the six kinds of Hyalonema agassizt 
are not systematically important individually; I believe, however, that several 
of them together demand recognition. Of the ten varying qualities here under 
discussion, nine are different only in two pairs from Stations 4656, 3684 (A.A. 17), 
and Stations 4740, 4742 pear-shaped. All the other pairs differ by from three 
to seven of these qualities. Since the units of the two mentioned strongly diver- 
gent pairs are connected in other ways, and since, as has been shown above, 
there appears to be no correlation between the degree of difference and the 
distance of the localities, I do not think that these differences warrant the 
