ISO MB. A. W. WATERS ON TUBUCELLARIA : 



familiar form in the Mediterranean, while we get the variety chuakensis with 

 the open spaces round the peristome further east ; but, contrary to Mr. Busk's 

 statements, I do not find any material difference between the opercula o£ 

 specimens from the Atlantic and of specimens from other localities. The 

 operculum has a thickened bar across, a little aboye the middle, and that 

 of T. fiisiformis is similar. In the Naples specimens the bar is rather higher 

 than in the others, and the state of preservation enables the oval opening in 

 the membrane under the operculum to be more clearly distinguished. 



There are about 27 tentacles. 



It will be noticed in figure 8 that two series of tubular ovicells may occur 

 together, but in the Naples specimens there is more frequently a series of 

 ordinary zooecia between the ovicells. In all cases the ovicells occur in 

 groups all round the zoarium. In Cellaria and other genera the ovicells 

 occur abundantly in parts of the zoarium and are absent from others. 



There are a great number of delicate muscles attached to the compensation 

 sac. 



Log. St. Paul's Rocks, N. Atlantic [Cliall.) ; John Adams Bank; Cape 

 Verde Island ; Madeira ; Mediterranean ; Shubuk, Red Sea (24) , collected by 

 Crossland; Manaar; Loyalty Isles; Torres Straits ; Queensland; New South 

 Wales ; Victoria ; South Australia ; Tasmania. 



Fossil. Eocene, Miocene, Pliocene of Europe ; Victoria, Australia. 



TuBUCELLARiA CEEEOiDES, var. CHUAKENSIS nov. (Plate 15. figs. 10-13, 

 18, 19 ; Plate 16. figs. 20-25.) 



Tubucellaria fusiformis, Busk (noii d'Orb.), Zool. Cliall. Exp. vol. x. p. 100, 1884. 



It is with doubt that this is separated as a variety from cereoides, merely 

 on account of the smaller beak -like ovicell, while there are no other characters 

 of sufficient importance upon which separation can be based. However, as 

 very few specimens with ovicells have been seen, and as it is important to 

 record which form my sections refer to, I have called it a variety. There 

 are large open pores or spaces round the peristome^ and the ridge separating 

 the peristome is very distinct; but in Mediterranean specimens these characters 

 are found, though they are not generally so well marked. There are about 

 27 tentacles. The ovicells and larva have already been referred to. 



In specimens from Grahamstown the ovicells are larger than those from 

 Chuaka, but not so large as those from Naples, indicating that, unless 

 additional characters are found, any separation of the T. cereoides group based 

 largely on the size of the ovicell may not be ultimately retained. 



Loc. Torres Straits (Busk), Brit. Mus. specimen 82.2.23.410 ; Grahams- 

 town, South Africa ; Chuaka, Zanzibar, 3 fath.. Mar. 29th, 1901 (512, 524), 

 and Wasin, Brit. East Africa, 10 fath. (501), collected by Crossland. 



