]4< Greenwich Time and the Longitude. 



portions of a species of Retepora spread over the fractured 

 surface. Further examination convinced me that the 

 specimen bore a certain resemblance to R. cellulosa, Lin. 

 Unfortunately only the posterior or non-celluliferous face is 

 presented to view, its chief characters are therefore somewhat 

 doubtful. The specimen was submitted to Mr. G. Busk, 

 so well known for his researches amongst the Polyzoa, who 

 considers it more closely allied both to a new Mediterranean 

 species about to be described by himself under the name of 

 JR. imperati (collected during the voyage of the Porcupine), 

 and to an Australian species living in Bass's Straits, which 

 he has called R. phoenicea (British Museum catalogue). Of 

 the two, the Schnapper Point specimen resembles the latter 

 more closely than the former, but so far as the characters can 

 be made out, Mr. Busk considers it to be a new species. 

 Should more complete specimens bear out this impression, I 

 would propose that it should be called Retepora McGoyana, 

 as a slight tribute to the many services rendered to Palse- 

 ontology by the able director of the National Museum. 



The Polyzoarium of the Schnapper Point specimen is 

 curled and undulating ; the posterior surface is strongly and 

 irregularly vibicite, with the weals a good deal raised above 

 the surface ; the fenestras are oval and elongate. 



Several other species of Polyzoa were present on the same 

 piece of Tertiary mud, but all fragmentary. The only one 

 recognizable was the Spiroporince vertebralis, Stolilzka; of 

 the Tertiary greensand of Orakei Bay, New Zealand. This 

 form is placed by its describer amongst the Cheilostomate 

 division of the Polyzoa, and belongs to Busk's genus 

 Onchopora (Anarthropora, of Smith). 



A few species of Foraminifera were obtained from the 

 same piece of mud. I hope to forward to the Society a com- 

 munication on these at a future date. 



Aet. VIII. — E. K. Home's Method of finding Greenwich 

 Time and the Longitude. By E. J. White. 



[Bead 10th November, 1873.] 



