BRYOZOA 57 



CELLARINELLA gen. nov. 



Cellarinella is proposed for some rather problematic species allied to Myriozoum, but 

 without distinct opercula. In the species known there are rosette plates, and one or two 

 avicularia below the aperture, having triangular or semicircular mandibles. Besides the 

 C. foveolata nov., C. nodulata nov., C. dubia nov., the Myriozoum marionensis Busk (') will 

 hâve to be placée! hère, and the relationship is in certain points vvith Myriozoum, Haswellia 

 and Tubucellaria, but probably most close with Systenopora gen. nov., and further knowledge 

 may show Cellarinella tu be superrluous. YVe may however find that a new suborder has 

 to be made for forms without an operculum, but in which there are a group of strong 

 muscles drawing a membrane over the oral aperture, which is situated low down some 

 distance from the peristomial aperture ; Systenopora and Cellarinella would be included, and 

 probably some other forms, but this requires further elucidation with better spécimens, and 

 I hope to return to it when opportunity occurs. 



Cellarinella foveolata sp. nov. 



(PI. V, figs. 2ti-h< 



Zoarium cylindrical, branching in various planes, with spreading calcareous base. Some 

 colonies are as much as 5o mm in height. The surface is deeply pitted without zoœcial divisions, 

 the peristomial aperture is broad, and short (often having the shape of a new moon), with 

 a raised cap over the distal end, and sometimes, but not often, it is also raised below the 

 aperture; there is a plate within the proximal edge ofthe peristome directed downwards. In 

 the older zoœcia the secondary aperture is round, and below the aperture, in some zoeecia, there 

 is a round avicularium with a semicircular mandible, while in older zoœcia the avicularium 

 may be within the peristome. 



The oral aperture is a considérable distance from the peristomial opening and at right 

 angles to it, the shape being nearly round with the proximal edge straightened. Xo oper- 

 culum can be prepared out, nor is any seen in eut sections, only a membranous contraction. 

 The ovicell is but little raised, and is not always visible on the surface. There are about 

 four latéral rosette plates, each with about ten communication pores, and there is one distal 

 plate, over which there is a pair of spinous processes, which are sometimes very slender, in 

 other cases stouter (frg. 2^). There are about 22 tentacles. 



This is very much like a Challenger spécimen from Station 320, mentioned and figured 

 in my Supplementary Report ( 2 ), however the Challenger one is slighter and the pores are more 

 elongate, and I describe the mandibles as triangular, but a mandible seen sideways or within 

 the peristome often appears more triangular than is the case. 



This and Systenopora contracta nov. differ from Myriozoum as represented by M. truneatum 

 Pall. in not having thick opercula, and further in the shape of the aperture ; also in having 

 latéral rosette plates with several communication pores. As I hâve elsewhere shown M. 



(1) This is not the .1/. marionensis of Jui.lien ami Calvet, Bryozoaires provenant de campagnes de 

 l'« Hirondelle », igo3. 



(2) Zool. Chall. Exp., vol. XXXI, pt. LXXIX, p. 3g, pi. III, fig. 47. 



VIII 



R 21 



