FLORIDAX BRYOZOA. 9 



little piece (see fig. 18 and 19) that holds the same relation to the Idm. Milneana. The 

 figures will suffice to distinguish this form with its zooecia sin^le or 2 and 2 in the 

 rows. From a single little specimen it is not worth while to say anything abont its 

 right to elaim a distinet name; I therefore notice it only as a variety of Idm. Mil- 

 neana. 



This species, principally in the expansions of the branches at a new diehotomi- 

 sation, gets the order of the zooecia dissolved, and so, with a hint to the gronp of 

 Proboscina (Aun., niihi), the systematical series goes on to the family of the 



HORXERILLE. 

 And indeed, the first species, we notice here, 



Filisparsa Pourtalesii (Pl. III, tigs. 20 — 22) 



so closely agrees with an Idmonea, that it could, with almost the -ame right, be refer- 

 red to that genus. So slight are the differences, that I can find between the Flcridan 

 species and the description of Idmonea irregularis by Meneghini '), that I have long 

 hesitated, before giving up the opinion, that these two species onght to be united. But 

 now I give a new name to the one, because I lind a more divergent description of 

 Idm. irregularis by Heller 2 ) with the Idmonean character much more expressed. 



The zooecia, perspicuously punctated by pores, are also here, on the Filis- 

 parsa Pourtalesii, for a great part disposed in transverse or oblique series, 3 or 

 even 4 in each series, and sometimes the series of the one side of the stem is conti- 

 nued to the otlier side in an oblique direction upwards. But the connexion between 

 the zooecia is never a true Idmonean one, for the front of their connected part is eon- 

 vex and as soon as they are raised from the front side of the stem, they diverge 

 with an orbicular lumen. Furthermore, on a great part of the stem, this serial order 

 is dis-olved and the zooecia irregularly scattered. This Filisparsan character reappears 

 on the back side of the stem, where we find the limits of the zooecia wellmarked as 

 longitudinal furrows, never forming that reticulated appearance that we have noticed 

 on the true Idmonea?. With this constitution, the stem presents a nearly orbicular cross- 

 section. Sometimes the lateral zooecia turn round, so that they seem to be opened on 

 the back side of the stem. As to the size of the zooecia, they nearly agree with that 

 of the Idmonea atlantica, varying about 0,15 ram. or less. In this as well as in other 

 respects, it holds the same relation to the Idmonea Milneana, as Filisparsa orakeien^i^. 

 Stol. 3 ), seems to show to Idmonea Giebeliana, Stol. Then, of course, if the two 

 ldmonece, as we have supposed, are to be united into the same species, even the two 

 Filisparsa?, ought to be placed at least very near each other. And indeed we can de- 

 fine the Filisparsa Pourtalesii thus: 



x ) Nuovi Annali delle Scienze naturali, Bologna, Sur. II. vol. III. p. 128. 



2 ) Bryoz. Adr. Meeres Verh. K. K. Zool.-bot. Gesellsch. Wien. Bd. XVII (1867) pag. 121. 



3 ) 1. c. pag. 111, tab. XVIII, tig. 1 et 2. 



K. Vet Akad. Handl. R 10. N:o 11. 2 



