BRYOZOA FROM ZANZIBAR. 471 



quite distinct on the dorsal sui-face without being seen on the 

 anterior surface ; in other cases a mark is seen all round 

 (fig. 4). When put into Eau de Javelle the zoacium often 

 breaks off at this line, and it is geen that this proximal tubular 

 part is connected at the base with the lower zooecium through a 

 rosette-plate. A rosette-plate higher up connects with the next 

 younger zooecium (fig. 7). 



The ovicell is lateral and pedunculate, and there are about 

 12 tentacles. 



Radicles may occur in abundance on the lower zooecia and not 

 merely from the normal position at the proximal end of the node. 



Immediately below the cfecum there is a small globular body 

 which, as it grows, is seen to be the ovarium, but in no case has 

 more than one ovarian cell been seen. The same thing occurs in 

 various Cellularidse. 



In many respects S. dendrograpta resembles S. glabra Hincks, 

 but that species has the stem internodes long and short alter- 

 nately and also there is no avicularium at the distal end in 

 <S'. glabra. From S. exilis MacG., it differs in the internodes 

 being approximately equal and in the different character of the 

 avicularia. S. exilis has 6-7 spines on the primary zooecium. 



The graptolite, Dendrograplus serpens Hopkinson *, has similar 

 colonies growing on a stout stalk, and the subcolonies and branches 

 a.re about the same size as those of the Stirparia ; and some sub- 

 colonies I collected in Llandrindod Wells of D. serpens H., or a 

 closely allied species, have the branching quite similar to this 

 Stirparia and might have been an impress of it, but as competent 

 authoi-ities have found it to be a graptolite, it shows how identical 

 the growth may be in widely different classes. The name is 

 given on account of the superficial likeness. 



Log. Chuaka, Zanzibar, 2 fath. (508), collected by Crossland. 



There is a specimen of aS'. dendrograpta from Port Phillip in 

 the British Museum. 



BuGULA NERiTiNA var. MINIMA Waters. 



Watei'S, " Rep. Sudanese Red Sea," p. 136, pi. xi. figs. 4-7, 

 for syn., and add Thornely, " Mar. Polyzoa of the Indian Ocean," 

 Ti-ans. Linn. Soc, Zool. vol. xv. p. 141. 



Loc. N". S. Wales (TT^.^ ; Red Sea (TF.) : Cargados Reef, 

 Providence, 50-78 fath. {Th.). Prison Island, Zanzibar Channel, 

 8 fath. (505); Ras Osowamembe, Zanzibar Channel, 10-20 fath. 

 (514) ; Chuaka, Zanzibar, tow-net (515), collected by Crossland. 



BuGULA ROBUSTA MacGillivraj. (PL LXIX. figs. 15, 16.) 



Bugida robusta MacG. Trans. R. Soc. Yict. vol. ix. p. 129 

 (1868) ; Prod. Zool. Vict. dec. viii. p. 29, pi. Ixxviii. fig. 1 (1883). 

 Bugukc capensis Busk, MSS. 



* Hopkinson & C. Lapvvorth,"On the Crraptolites of the Arenig and Llancleilo 

 Rocks of St. Davids," Quart. Journ. Geol. Soc. vol. xxxi. p. 665, pi. xxxvii. fig. 3 



(1875). 



