294 



A. ^y. WATERS ox CHILOSTOiTATODS BETOZOA FEOM 



late ; on other zooecia they expand considerably towards the extremity. 

 TVith a form like the present it is difficult to know whether it should 

 be called Smittia or Mucronella, and the two genera are not sharply 

 defined. 



Mucronella delimtula, 'Busk^Cha.U.. Eep. p.l56, is, no doubt, closely 

 related ; but the triangular mandible shows that the two forms are 

 not absolutely identical. I have a specimen dredged from the coast 

 of Victoria which has a narrow ligulate avicularium,butl do not think 

 that it ought to be separated from those with a larger avicularium, 

 as the shape is approximately the same. Mr. Busk calls attention 

 to the central denticle being in front of the operculum, as if it were 

 exceptional ; but this is the rule in this family. 



Loc. Living: A^ineyard Sound and Long Island Sound {V.) ; 

 Africa (H.) ; Yictoria Bank, S.E. Brazil (S'2 fath.) ; Yictoria (on 

 Adeona) ; Xaples ( W.). Fossil : Crag ( W.), Bairnsdale and Eiver- 

 Murray Cliffs. This or a variety fossil from Waipukerau and Napier 

 (Xew Zealand). 



2^. MucEONELLA cocciNEA, Abildgard, Tar. 1IA3IILLATA, Busk. 



A specimen from Aldinga in crusted a Cerithium or allied shell. 

 The surface is smooth or faintly sulcate, with a single or double row 

 of pores round the base. The ovieell is very small and decumbent. 

 The fossil is so badly preserved that it was not readily recognized. 



Loc. Living : coast of Antrim. Fossil : Crag, Aldinga. 



26. MircEOJfELLA cocciNEA, Abildgard, var. EEsuprsfATA, JVTanz. 



Mucronella coccinea. Waters, Quart. Journ. Geol. Soc. vol. xxxviii. 

 p. 266. 



In well-preserved avicularia it is clear that the mandible was 

 spatulate, but the avicularian opening triangular. 



Loc. Aldinga ; Mt. Gambler. 



27. MicEOPOEELLA GEisEA, Lamx., form Adeoxa. 



Adeona grisea, Lamouroux, Expos. Meth. p. 40, pi. Ixx. fig. 5 ; 

 Kirchenpauer, "Ueber die Bry. Gatt. Adeona/^ Journ. 3Ius. Godeffroy, 

 1879, p. 9, pi. i. fig. 8, 8a. 



Dictyojpora grisea, MacGillivray, Xat. Hist, of Yict. decade vii. 

 p. 23, pi. Q6. fig. 1, 1«, h, c, d. 



Dictyopora celhdosa, MacGillivray,Trans. Boy. Soc. Yict. 1868; Nat. 

 Hist. Yict. decade v. p. 37, pi. xlvii. fig. 1, and decade vii. pi. Ixvi. 

 fig. le. 



Adeona celhdosa, Kirchenpauer, op. cit. p. 10. 



Microijorella cdlidosa, form Adeona, Waters, Quart. Journ. Geol. 

 Soc. vol. xxxix. p. 437. 



From Muddy Creek there is a fragment spreading out in flabelli- 

 form manner from the base, to which probably a flexible stem was 

 attached. 



From the range of zooecial variability found in specimens that I 

 have examined, and from the published descriptions, there does not 

 seem to be sufficient reason for separating J/, grisea from M. celhdosa. 



