DIASTOPORID^. 113 



Branches dilated at the ends ; cells raultiserial, surface smooth, dotted. 



Alecto dilatans, W. Thompson ; Johnston. 



DiASTOPOKA ECHiNATA, Reiiss, Foss. Polyp., (1. W. T. B., p. 52, pi. vii, figs. 14, 15. 



Idmonea divaricata (?), I. DEPRESSA (?), I. CENOMANA (?), I. ELEGANS (?), B'Orbigny. 



Fam. IV. DIASTOPOBIDJ!:, Busk. 



Polyzoario disciformi vel indefinito, adnato, sessili, vel stipitato. 

 Polyzoarium discoid or indefinite, adnate, sessile, or pedunculate. 



Genus 7. Diastopora. 



Polyzoario adnato, discoideo vel flabelliformi, plerumque excentrico. Cellulis prorsus 

 immersis ; orificiis horizontalibus vel obliquis, ellipticis. 



Polyzoarium adnate, discoid or flabelliform, usually excentric ; tubes wholly immersed ; 

 openings horizontal or oblique, elliptical. 



'DiASTOPORES SIMPLES,' M. Edwards, 1. c, p. 39. 



Diastopora (pars), Lamouroxix (?) ; Milne-Edwards; Blainville (J) ; Reuss ; Hagenow ; 

 Michelin ; D' Orhigny, &,c. 

 — Johnston. 



TuBULiPORA (pars), Johnst. ; Auct. 



1. D. SIMPLEX, {n. sp.) ? PI. XX, fig. 10. 



Polyzoario discoideo, adnato, cellulis antice convexis, superficie nitide punctulata. 



Polyzoarium discoid, closely adnate, tubes not flattened in front ; surface finely 

 dotted. 



Habitat. — C. Crag on shell, S. Wood. 



Of published figures the nearest I am able to find resembling the present form is that 

 of D. ohelia, Johnston -^ but as the species that author had in vievir grows in undefined 



1 It is difficult to perceive what reason can have induced the learned author of ' Brit. Zoophytes' to 

 confound his D. ohelia with the Ohelia tubulifera of Lamouroux. The latter is a Tubulipora (mihi), and 

 has not a feature in common with the D. ohelia of Johnston. 



15 



