182 Fredei irh i'liapmaii : 



oecnis. In outliiif it is of an elonjLrate nr ovatr type, bnt comes- 

 within the limit of variation in the aml)ital outline assumed hv this 

 species. This example measufes 8.5 mm. x 7 mm., and Avas found 

 in' Bore 11 at noO-od.") feet in white poly/.oal lork of the Mount 

 Gambier type. 



In one instance (Bore 8, 165-18U feet) an examph' of this species- 

 was found with the periproct inframarginal, hut this need not be 

 considered as more than an exceptional chaiactei-. as such variation 

 is characteristic of the genus as a whole, but not of the species under 

 present notice. 



ANNELIDA. 



POLYCHAETA TUBICOLA. 



Fam. SERPULIDAE. 



Genus 8EUPLTLA, Linne. 



(Skrpula. ouYKNKNSis, sp. uov. (Plate XVIII., Figs. 24, 25 ; 

 PI. XIX., Fig. 42). 



Descnpti(ni . — Tube free, stout, hexagonal in .section, gently 

 tapering and slightly curved; the cusps formed l)y the six longitu- 

 dinal irregular ridges. Exterior of shell annulated by variably 

 spaced rings of growth, producing a roughened appearance on the 

 edges of the ridges. Intciiov of tube round and polished. 



Di i.ic'iixions. — l-'igured specimens (co-types). Spec. A. — Length. 

 5 mm. ; width. 2 mm. Spec. \i. — Length. 6.5 mm.; greatest width, 

 1.75 mm. 



()lfs(rr((ti())is. — Several forms of worm tubes ascrilied to Serpnla 

 ap})roach tlie present species, l)iit none seems to exactly match it in 

 its hexagonal and Huted cross section. 'I'he specimens are very 

 constant in charai'ter. From the sliells of Dciif (ilium they are 

 typical shell-structure under the microscope (pi. xix., tig. 42). 



Orc///'/r//rr.— Bore :'.. 21(1 feet. Borr 1!. 562-590 feet. Fairly 

 common. 



Genus DITRIIPA, Berkley. 



l)nKU}'.-\ COKNEA, Ijiiine sp., viir. woumbetiknsis, McCoy. (Plate 

 XVI 11., Figs. 26-28). 



Ditrupa ii'urui/n'f/ctis/.s, McCoy, 1874, Prog. Rep. Gcol. 



Surv. Vict., pt. I. p. 22. tig. 4. Chapman, l!)(l5. Vict. 



Nat., vol. xxi.. No. 12. p. 18(1. 



JJescr/'/ff/oii. — Tube lathcr small, slende)- and taj)eiing; swollen 



near the apex and tiinua1c(l from the shoulder of the swelling to 



