AND OTHER MEDITEREANEAN LOCALITIES. 9 



SCEUPOCELLARIA INCURVATA, sp. nOV. (PL 1. figS. 16, 17.) 



Specimens from Naples in most respects resemble S. Delilii, 

 but the branches of the zoarium are stouter, with a much larger 

 ■scutum extending beyond the opesium. There is usually a spine 

 at each upper corner converging as in S. Delilii, Aud. Also the 

 median avicularia are similar to those of S. Delilii and the 

 ovicell is entire; but the two can be distinguished by the 

 vibracular chambers, for in the present species they are somewhat 

 oval, extending half across the zooecium, with the groove turned 

 inwards, and the pair of vibracular chambers at a bifurcation 

 have similar curved grooves. It will be seen that this curved 

 groove, though not as large, is similar to that of Gaberea, and, 

 except on account of the differeuce in the oral aperture, it is 

 difficult to see any reason for separating the two genera. 



S. scabra, Delilii, and incurvata seem to be a natural group, 

 distinguished, however, by striking differences in the vibracular 

 chambers. 



In the whole of the Cellulariidse one of the most useful specific 

 characters is the way in which the radical fibre is attached, for 

 in each species there seems nearly always to be some definite 

 position from which it starts in all zooecia. In SGrupocellaria 

 and Caherea it grows from a chamber at the base or side of the 

 vibracular chamber. In Menipea aculeata, M. Buskii, M. cirrata, 

 and M.funiculata the radical arises from the base of the iuteruode ; 

 whereas in M. cervicornis, M. compacta, and M. ternata var. 

 gracilis, it arises from the top. It is, however, not only in the 

 Cellulariidae that the position of the radical is a useful character, 

 but in the description of all rooting forms it should be mentioued. 



Caberea Boryi, Aud. 



The oval body to which I refer in my paper * on gland-like 

 bodies (p. 277) occurs constantly in the Eapallo specimens. It 

 is rather smaller than in those from Trieste, and stains deeply 

 and uniformly. 



There is one very large avicularium below the bifurcation. 

 This is apparent in the Eapallo, Naples, and Eoscofi" specimens, 

 and also in one from Adelaide which I consider to be C. Boryi. 

 It appears to have been overlooked in this species, but somewhat 

 similar avicularia in the same position have been figured in 

 C rostrata, B, 



* Journ. Linn. Soc, Zool. vol. xxiv. p. 272. 



