GOSSEA BEACH YMERA. 103 



The present collection contains specimens of three of these genera, Gossea, 

 Gonionemus, and Olindias. 



Gossea L. Agassiz, 1862. 

 sens. em. Browne (: 04). 



Olindiinae with tentacles of one kind only, arranged in eight groups, and 

 with other single tentacles or cirri ; without sucking pads on any of the 

 tentacles ; without centripetal canals. 



Gosse ('53, p. 407, pi. 21) has given us an excellent description and 

 unusually beautiful figures of his Thaumantias corynetes, for which L. Agassiz 

 later founded the genus Gossea ; and a second species has been described by 

 Haeckel ('79) under the name G. circinata, from the coast of France, but 

 the latter is almost certainly nothing more than an older stage of 

 G. corynetes. The only important differences between the two are the pres- 

 ence of three members in each tentacle group in G. circinata instead of two 

 and a small spur, as in G.cori/netes; and the pi'esence in the former of adradial 

 cirri, which are lacking in the latter ; but these differences are merely 

 developmental characters, since Gosse ('53) has himself mentioned the dis- 

 covery of a few specimens of G. cori/ncies in which the third tentacle in 

 each group was considerably larger than it appears in his figures. 



Gossea brachymera, sp. nov. 

 Plate 30, Figs. 1-10. 



Acapulco Harbor; surface; 1 specimen, 5 mm. in diameter, 4 mm. high. 



Fortunately the single specimen was in such excellent condition as to enable 

 me to study and illustrate it in detail. 



The bell is high, dome-shaped (PI. 30, fig. l) ; the gelatinous substance stiff 

 and so thick that the umbrellar cavity is very shallow. The manubrium, 

 supported on a short, broad peduncle, is very short. In G. corynetes there is 

 no peduncle. There are four triangular, slightly fimbriated lips. 



Bell margin. — The arrangement of the tentacles is of course the most char- 

 acteristic feature of Gossea, and in this respect the present specimen shows a 

 condition either less advanced (if it prove to be merely an early stage of devel- 

 opment) or more primitive (if it be the final condition) than does G. corynetes. 

 There are eight groups of tentacles, four perradial and four interradial, and 



