132 Proceedings of the Royal Irish Academy. 



3. Triticella Jcorenii, G. 0. Sars. PL Y., fig. 1. 



Triticella horenii, G. 0. Sars, Chiistiania Yidensk. Selsk. Porh. 

 1873, p. 393, pi. ix. 



Triticella flava, JSTormaii, Ann. jST. H., Feb. 1879, p. 138. 



Triticella horenii, Hincks, Brit. Mar. Polyz. p. 545, pi. xlv., 

 Igs. 8-10; pi. Ixxx., fig. 6. 



Zocecia hyaline, slender, laterally elongate-ovate ; posterior extre- 

 mity somewhat incurved ; dorsal margin slightly curved outwards ; 

 growing in tufts from a continuous horny crust. Frenaculmn very 

 thin, approaching the posterior extremity. Peduncle very variable in 

 length, from half the length of the cell to three or four times as long. 

 Polypide with 18 tentacles. 



This species, founded by Sars, is described by him as having the 

 zocecia scattered, and the peduncles rising from a deKcate creeping 

 stolon. In examples which I have received from the Royal Irish 

 Academy Survey, the zocecia grow also in tufts of very variable size. 

 In these cases, the peduncles rise from small apertures in a continuous 

 homy crust, which has never been previously observed for this species. 

 The peduncles are longer where the tufts are densest, in some cases 

 being four or five times longer than the zocecia. The majority, how- 

 ever, are two or three times as long. "Where the zocecia are scattered 

 and around the margins of the tufts, the peduncles in some cases are 

 scarcely half the length of the zocecia. Owing to this variability, 

 Canon IS'orman gives it as his opinion that this species is really 

 identical with the T. flava of Dalyell ; but, ^as has been previously 

 shown, there is not sufficient evidence to warrant this. 



The only British locality previously recorded for this species is 

 from the shore of Kerrera Sound, near Oban, where it was found by 

 Norman, growing on Sacculina carcina, and was described by him as 

 T flava, Dalyell. Sars obtained his specimens near Bergen, and at 

 Bohuslan. It has been obtained on three occasions by the Royal 

 Irish Academy Survey from the south-west coasts of Ireland, in each 

 case growing luxuriously in tufts on various Crustacea. 



Sahitat. — On di:fferent Crustacea from tide-marks to very deep 

 water. 



Localities. — Shore of Kerrera Sound, near Oban ; on Sacculina 

 {larcina (A. M. I^orman) : Berehaven, S. "W". of Ireland, growing pro- 

 fusely in tufts on Xanthia rivulosa and Portunus arcnatus, from 

 a depth of 7 fathoms ; also from log 73, at a depth of 50 fathoms 

 (Roy. Irish Acad.). 



