25 



FAMILY CATENICELLID^. 

 Catenicella, BlainriUe. 



C. lorica, Busk. Glenelg. 



C. ventricoscf, Busk, St. Vincent's Gulf ; Encounter Bay. 



C. hastata, Busk. Glenelg ; St. Vincent's Gulf. 



C. cribraria, Busk. St. Vincent's Gulf ; Encounter Bcay 



C. ru/a, McG. 



C. margaritacea, Busk. Glenelg ; St. Vincent's Gulf ; Spen- 

 •cer's Gulf. 



C. elegans, Busk. Glenelg ; St. Vincent's Gulf ; Spencer's 

 Oulf. 



C. Dawsoni, Wyv. Thomson. Some fragments occur which 

 :seem referable to this somewhat doubtful species. 



C.fuscM^ McG. 



C c7"ystaUina, Wyv. Thomson. 



Calpidium, BusJt. 



C. ponderosiim, Goldstein, sp. St. Vincent's Gulf. 



FAMILY CELLULARIIDyE. 

 Cellularia, Pallas. 

 C, cuspidata, Busk. 



ScRUPOCELLARiA, Van Beneden. 

 S. scrupea, Busk. Some very imperfect fragments. 



Menipea, Lamx. 



M. crystallina. Busk, sjd. St. Vincent's Gulf. 



M. Porteri, n. sp. PL ii., figs. 1 — 16. 



Zoarium dichotomously branched, branches articulated by 

 ■double tubes. Zooecia biserial, about 5-7 in an internode, 

 elongated and narrowed downwards ; aperture elliptical and 

 occupying about two-thirds of the front, margin slightly 

 thickened ; three spines, the lower clavate or bifurcate, on the 

 outer side above, and two simple spines on the inner side ; 

 scutum large, lamina expanded, peduncle narrow. Lateral 

 .avicularia rare, large, situated on the upper part of a zorecium, 

 rostrum with a sharp, curved beak, the narrow mandible directed 

 horizontally outwards. No anterior avicularia. Oa?cia large, 

 rounded, with a row of round foramina along the upper edge. 



This species, which I dedicate to the Rev. Dr. Porter, from 

 whom I first received a specimen, grows in small tufts, not ex- 

 •ceeding half an inch in height, on alga^. The scutum is large, 

 somewhat reniform and saccular. The lateral avicularia are 

 rather scarce, many internodes not showing them and others 

 liaving only one ; they are of large size, altliough not always so 



