AND OTHEE MEDITEEKANEAN LOCALITIES. 7 



differences in the number and form of tlie rosette-plates are rery 

 considerable *. 



Of the seven Mediterranean species of Scrupocellaria, all 

 except S. incurvata and the variety Bertholletii occur elsewhere. 

 8. reptans, scruposa, scrupea, and inermis are Northern, while 

 S. reptans and scrupea are also found in the Australian seas. 



SCEUPOCELLAEIA DeLILII, Aud. (PI. 1. figS. 14, 15.) 



Crisia Delilii, Audouin in Savigny's ' Description de I'Egypte,' p. 242, 



pi. xii. fig. 3. 



Scrupocellaria Delilii, Busk {non Alder), Q. J. Micro. Sc. vol. vii. p. 65, 



pi. xxii. figs. 1-3. 



Specimens from Naples, Eapallo, and the Gulf of Taranto 

 belong most undoubtedly to the species figured by Savigny. The 

 two converging spines are characteristic. Most colonies have no 

 frontal avicularium, and in those that have it is only found on 

 some zooecia. In one good colony there is only one, and that on 

 a zocecium just below a bifurcation. 



The zocecium at each bifurcation has a central spine, a 

 character which Mr. Hincks mentions in S. scahra, but which 

 seems to be fairly common in the genus, as it occurs in S. scrupea, 

 8. Bertholletii, and ;S^. reptans. On the dorsal surface at the 

 bifurcation there are two vibracula, whereas in S. scahra there 

 are none ; but the most important distinction between the two 

 species is in the vibracular chamber, which is much narrower and 

 longer than that of 8. scahra, and the rooting attachment is more 

 directly under the vibraculum. 



It will thus be seen that 8. scahra remains a Northern form not 

 yet found south of the British Isles, while 8. Delilii is Southern, 

 occurring in the Mediterranean and Madeira. The internodes 

 ai'e much longer than those of the Mediterranean 8. scrupea. 



Tliis is closely related to 8. Macandrei, but from the figures in 

 the ' Challenger ' Eeport they would seem to be distinct. 



SCETJPOCELLABIA SCEUPEA, BusJc. 



There are two vibracula at a bifurcation similar to those which 

 Levinsen has described as occurring in 8. scruposa. The only 

 other species in which I have found two are 8. ornithorhynchus, 

 Delilii, and incurvata. The small avicularia, by the ovicells, are 

 similar to those which Levinsen describes on 8. scruposa. These 



* " InterzocEcial Connection in Flustra and other Bryozoa," Journ. Key. 

 Micro. Soc. p. 279, pis. vii. & viii. (1896). 



