ANGELOPSIS DILATA. 311 



In general appearance the specimen resembles the figure given by Haeckel 

 of Stephalia ('88b, pi. 6, fig. 32), except that there is no large central primary 

 siphon. The pneumatophore is voluminous, 5 mm. in diameter, rounded, and 

 smooth walled. There was no pigment visible, even when the specimen was 

 first taken. The nectosome is narrow, and this with the globular extension of 

 the siphosome below, gives the corm a dumbbell-hke outline. Although most 

 of the nectophores are detached, the radial muscle bands to which they were 

 connected are easily traced. But they are more contracted and distorted than 

 in Dromalia. The aurophore lies in the usual position on the surface of the 

 pneumatophore near its junction with the nectosome. It is sac-like, and smooth 

 walled (Plate 21, figs. 6, 7) except for one small prominence near its outer margin. 

 There is no trace whatever of the papillae which occur in Archangelopsis and 

 Dromalia, nor can we suppose that such were normally present but have been 

 torn off, because the outer wall of the aurophore is smooth, and shows no 

 traces of the injury which such mutilation must necessarily have caused. To 

 test this I tried the experiment of detaching a few of the papillae from a speci- 

 men of Dromalia, and found that it caused very evident damage. 



Zone of proliferation: On account of the damaged condition of the specimen 

 the location of this zone is not so evident as it is in Dromalia. But the following 

 facts can be determined: — there are no papillae on or just below the aurophore; 

 there is a bare zone immediately below the aurophore, just as in Dromalia, 

 (p. 306) on which there are neither nectophore plates, buds, nor cormidia. On 

 the other hand on the nectosome, exactly opposite the aurophore there are two 

 very young nectophores, and between them several small buds, probably young 

 siphons (Plate 21, fig. 6, 7). These facts taken in connection with the very 

 clear evidence afforded bj^ Dromalia show that in Angelopsis as in the latter 

 genus the zone of proliferation is not the aurophore, but lies exactly opposite 

 to it. 



Cormidia. So few of the cormidia remain attached that I can only say 

 of their arrangement on the siphosome, that it is apparently spiral. 



The cormidia of Angelopsis like those of Rhodalia and Dromalia are situ- 

 ated on conical gelatinous prominences. In the one example studied there 

 was a single cormidium on each prominence. However, as all the older cormidia, 

 originally borne on the basal part of the siphosome, were detached, we can not 

 assume that additional ones may not be developed on each prominence in this 

 genus, as they are in Dromalia. The siphons are of the usual type. All the 

 tentacles were broken off, and the tentilla, if any were present, detached. My 



