408 bullj:tin: museum of comparative zoology. 



replaced, in Hippopodms hippopus b\- a series of four knobs, close to, 

 and often overhanging, the dorsal margin of the nectosac, as has so 

 often been described. 



Tentilla. The adult tentilla of V. glabra (Plate 4, fig. 7) very 

 closely resemble those of T. spinosa (1911b, plate 15, fig. 7), con- 

 sisting of the same coiled cnidoband, lying nearly in a single plane so 

 as to simulate the cnidosac of Hippopodius, and of a single terminal 

 filament, though the large spindle-shaped cnidoblasts are fewer in 

 number. And, as in V. spi7iosa, the tentillum, in its development, 

 passes through a stage in which the cnidoband is spirally coiled (Plate 

 4, fig. 6), the final state being apparently attained by a loosening of the 

 spiral, and its contraction into one plane. 



Siphons and gonophores. These organs so closely resemble those 

 of V. spinosa (1911b, p. 212) that no account is necessary here further 

 than to point out that like that species, each cormidium bears both cf 

 and 9 gonophores. 



DiPHYiDAE Eschscholtz. 



I have discussed elsewhere (1911b) the three subfamilies, Abylinae, 

 Galeolarinae, and Diphyopsinae, into which this family has usually 

 been di^^ded and believe that the limits previously given them still 

 stand; but with the addition of a fourth, Clausophyinae (Bigelow, 

 1913, p. 70), for the reception of Clausophyes. Moser (1913a, p. 148), 

 it is true, has recently given a new definition to the Galeolarinae, 

 expanding it to include " alle Diphyes-Ahnlichen f ormen . . . . , bei 

 deren Oberglocke das Hydroecium rudimentar ist, und tiefer als der 

 mund legt, wahrend es bei der unterglocke sehr primitiv ist." But 

 the nature of the cormidia, whether detached as free-living eudoxids 

 (Diphyopsinae), or permanentl}" connected wath the stem (Galeo- 

 larinae), seems to me a much more fundamental matter than the 

 precise outlines of the hydroecium. And at any rate, the former is 

 an absolute, the latter only a gradual difference, for there is no sharp 

 line between species with deep, and those with shallow, or suppressed 

 hydroecium. 



Abyla trigona Quoy and Gaimard. 



Abyla trigona Quoy & Gaimard, 1827, p. 14, pi. 2B, fig. 1-8. 

 (For synonym}^ see Bigelow, 1911b, p. 221). 



This well-known species was taken at Stations 10,163, 10,166, 

 10,171, 10,178, 10,186, 10,192, 10,194, 10,207, and 10,211, in both 



