BETOZOA rnOM KEAE CAPE HOEN. 235 



but, again, it is ouly on a few zooecia that these are found, and I 

 may add that it has been necessary to draw the spines unduly 

 large, as the figure is but slightly magnified. In the Vincularia 

 ornately Busk, these spines are mentioned as being a constant 

 character. "Unfortunately the V. ornata is not in the British 

 Museum collection, for a specimen in the Busk collection was 

 found to have been so named by mistake. 



There are no signs of ovicells, and in the sections cut there 

 were no ova. There are 26 tentacles in the Cape Horn speci- 

 men. The opesial opening of T. gotliica (Busk), of the ' Chal- 

 lenger,' is wider than that of any T. lahiata examined, but the two 

 are evidently very closely allied. However, it does not seem that 

 Busk was justified in considering the ' Challenger ' specimens as 

 being the same species as d'Orbigny's Cretaceous fossil Vincu- 

 laria gotMca, d'Orb., as these last are very much smaller, the 

 length and width of the zooecia in specimens from Meudon 

 (kindly sent to me by Mons. Canu) being about one-half, and 

 the opesia are also much smaller. There is, however, in these 

 fossil specimens a projection at each side of the opesium and 

 one from the proximal edge. Gellepora crustulenta, Goldf., 

 seems to me to be only an encrusting form of Vincularia gothica^ 

 d'Orb., as seen in a specimen from Moen, Denmark ; and in 

 both the erect and encrusting form there are ouychocellaria but 

 no small avicularia ; whereas in Thalamoporella gotMca^ Busk, 

 no ouychocellaria have been seen, while there is a small 

 avicularium. 



The Vincularia gotJiica, d'Orb., is placed under Floridina by 

 both Jullien and Canu, but I am by no means satisfied that 

 there are sufficient grounds for separating Floridina from Ony- 

 chocella, but whether we are right in placing the present form 

 with Thalamoporella time will show. T. Rozieri, Aud., the 

 type of the genus, has external ovicells. A specimen sent to me 

 as Onychocella (Vincularia) disparilis, d'Orb., fossil from the 

 Cretaceous of Moen, Denmark, has similar opesia to the recent 

 T. lahiata, B., and to one zooecium there is a narrow bridge; the 

 fossil has onychocellaria, and our further examination of lahiata 

 suggests its being very nearly allied to Onychocella. 



The various specimens of T. lahiata, Busk, show how more ample 

 material may modify our ideas, for occasionally there may be a 

 bridge and occasionally spines, and these have been noted by 

 some authors, and species based on these characters. 



