58 ZOOLOGICAL COLLECTIONS MADE DURING [Jan. 4, 



one is almost perfectly circular ; it is 2| millims. in diameter, the 

 youngest is 1 millim. in greatest diameter. 



Obs. The nearest recent ally of this species appears to be Disco- 

 porella complieata, Haswell (Proc. Linn. Soc. N. S. W. iv. p. 354), 

 from Port Jackson, New South Wales. It has the spines on the 

 wall of the cell and the trabeculfe with their spines ; but the spines 

 are apparently found also between the cells. Its main points of 

 difference from this species are the roundness of the cell-orifice, 

 which has the peristome entire, and the presence of secondary can- 

 celli between the cancelli of the sides, of which no trace occurs here, 

 though, as has been described for this species, the central cancelli 

 are partially tympanized and have a secondary opening below. 



In spite of the absence in the somewhat too small drawing given 

 by Milne-Edwards {I. c.) of the immense sinus which extends down 

 the front of the cell in the recent specimens, it is possible that his 

 species is identical with the present one, as with the power employed 

 by him it would not necessarily catch the eye. The median cycles of 

 tubes are depicted there as longer than in the recent specimens ; but 

 that is probably due to its being an older specimen. The peculiar 

 trabeculated structure of the surface is slightly indicated in his figure, 

 and the continuation of the rudimentary tubes onto the lamina is 

 distinctly insisted upon. Busk's figures give a much better idea of 

 this species ; but here again the trabeculse between the cells are 

 much broader than in the recent specimen. The marginal spines 

 of the young cell probably represent the longer peristomial spines 

 of adult specimens of L. hispida, Fleming. 



TuBULiPORA SERPENS, Linne. 



Tubipora serpens, Linne, Syst. Nat. (12) p. 1271. 



Alecto disposita, Hutton ?, Cat. Mar. Mollusca N. Z. p. 103. 



Tiibulipora serpens, Busk, Cat. Polyz. Brit. Mus. iii. p. 25, pi. xxii. 



Idmonea serpens, Hincks, Hist. Brit. Mar. Polyz. p. 453, pi, Ixi. 

 figs. 2, 3, pi. Ix. fig. 2. 



Sometimes with a small bare lamina outside the zocecia. No 

 purple colour observed. Colour dead white, owing to the very 

 numerous minute punctures. 



Hab. Elizabeth Island, Straits of Magellan, 6 fathoms ; twenty- 

 five colonies or parts of colonies on a thin Fucus. 



TuBULiPORA ORGANIZANS, d'Orbiguy ? 



Tubulipora organizans d'Orbiguy, Voy. Amer. m^rid. Zooph. 

 p. 19, pi. ix. figs. 1-3. 



Tubulipora organizans. Busk?, Phil. Trans, clxviii. p. 193, pi. x. 

 figs. 20-25. 



This species appears to be represented by eighteen colonies or parts 

 of colonies ; they consist of broad elongated masses, either simple or 

 with branches of the same character given off laterally or grouped 

 round a common centre. The largest colony measures 8 millims. at 

 its greatest length. The lobes consist each of a broad flattened mar- 



