McUlerriiuani TiMvia and Llmonoa. 13 



l?iv of Xiiplos. |). 271 (187'.>); Scp-iienza, Formnz. Tcrz. Ki'pgio, 

 |>l)."'JO<),'2it7, 371 (I87i>) ; Neviaiii, Foss. Itiil. Idmoii. Boll. S«c. Geul. 

 Itiil. vol. \\x. pp. {\-2), 'I\ (I'.KH)). 

 Idiwmea ment(/hi/iii, Wiiter.s, "Ovicells of Cvdoe. JJry.," Journ. Linii. 

 Soc., Zool. vol. XX. p. '218, pi. xiv. lig. 2 (1888). 



This is (]i'scril)cd by Ileller as only differing; from /. 

 vH'ntUflihui, lU'll., in liavinji; tlie branches smaller, and 

 \>iihout liavinj; various specimens for comparison such a 

 description is difficult to follow, but now 1 have several of 

 both and have seen co-types. The specimen described by 

 me as J. nipnei/fiiuii * with very remarkable ovicells is un- 

 doubtedly /. triforis, and almost exactly corresponds with 

 the specimen now Hgured. 



Until this i)apcr was completed only the ovicell of the 

 one describe! specimen was known, but another one lias just 

 been discovered in my Capri material — in which, however, the 

 lari:;e jj^lobular ovicell is smooth, euclosiiig a serie«; whereas 

 the one previously descril)ed was bagpipe-shaped with openinj^s 

 remin(lin;j; us oi' the ovicells of Hornera. Perhaps the Capri 

 specimen is in a younger stage, or specific separation may he 

 necessary. 



If it were not for the remarkable ovicell it might seem 

 jnstifiable to consider this as only a smaller form, and Friedl 

 speaks of this as var. of /. gracilis, Meneg., considering 

 /. )iieii('(//iinii as a synonym of the latter. This sj)eeies is 

 referred to (p. 11) under /. menegldnii, and the dorsal 

 superimposed layer is mentioned. 



Loc. Naples, Capri, Oran, Adriatic {Hell.)', between Fayal 

 and Pico. 



FussH. Italian Upper Tcrtiaries. 



Idmoneu serpens, Linn.? (PI. II. figs. 3, 1, 5, 8, 1 1.) 

 See Idmonea serpens, Ilincks, Brit. Mar. Poly, p. 4o3, pi. Ixi. ti•,^ -2. 



This is what has been understood by many authors as 

 /. scrjjfius, thongli other things have also been called serj/rns. 

 ll is an adnate strap-shaped form, and it does not seem that 

 adnate and erect forms can be separated geneiieally and 

 sometinu's not speeilieaily, nor do 1 see that these forms can 

 be i)nt under Tiibulipora, althongh the early stages are 

 similar. Forms, however, which continue for a long distance 

 of the same width can be separated from those which rapidly 

 expand, even though we may sometimes find dillieulties 

 The ovicells occur on the median line, and in the specimens 

 figured (S, 11) near a bifnnation, n(»t enclosing any zooceia. 



* Loc. til. i>l. xiv. li-. -2 (1888). 



