PBOBOSCTNA. 63 



I therefore propose to include S. sarthacensis, Perg., among the 

 synonyms of P. ramosa (Hag.). 



Michelin's species, 1 on the other hand, appears to be distinct, 

 for the zoarium is formed of regular bands, which branch 

 repeatedly and may anastomose ; the zooecia are shorter, and the 

 peristomial portions less raised. Michelin's species is more allied 

 to D'Orbigny's Reptotubigera ramosa than to his P. ramosa. 

 From the former it is separable only by the fact that the peri- 

 stomes open irregularly, whereas in that species they occur in 

 straight series. It is therefore necessary to find a new name for 

 Michelin's species. It appears to me practically identical with 

 D'Orbigny's P. t&ueasiana? though in this the zoarial bands are 

 less regular ; they agree, however, in the general shape of the 

 zoarium, its flat, depressed surface, and the irregularity of 

 the peristomes. 



It is also necessary to find a name for D'Orbigny's Repto- 

 tubigera ramosa, which, as has been previously remarked, is the 

 closest ally of P. eudesi, Haime. Pergens includes with it 

 Reptotubigera serpens, D'Orb., and Proboscina radiolitorum, D'Orb., 

 a course with which I fully agree. As the last name dates from 

 the Prodrome in 1849, it takes precedence as the name of the 

 species. 



The formulae for the four species are as follows : 



P. eudesi, Haime 102 4-7 



P. ramosa (Hag.) 2 2" 1-8, including P. ramosa, 



D'Orb., and 8. sartha- 

 censis, Perg. 



P. radiolitorum (D'Orb.) ... 1' 2 4-7, including Reptotubigera 



ramosa, D'Orb. 



P. toucasiana, D'Orb 102 4-8, including D. ramosa, 



Mich. 



LIST OF SPECIMENS. 



D. 14. On Terebratula intermedia, J. de C. Sow. Great Oolite. Glouces- 

 tershire. Wright Coll. 



D. 1843. Inferior Oolite Pea Grit. Gloucestershire. Holl Coll. Figd. 

 PL II. Fig. 1. 



60365. Bathonian. Ranville, Calvados. Tesson Coll. 



1 H. Michelin. Icon. Zooph. 1845, p. 203, pi. lii. fig. 3. 



2 D'Orbigny. Op. cit. p. 856, pi. DCXXXIV. figs. 1-6 



