THE BURROWING BARNACLES (CIRRIPEDIA: ACROTHORACICA) 119 



Segment counts for the left terminal cirri of two specimens follow: 



Terminal 

 cirrus : 



Ramus: an- pos- an- pos- an- pos- an- pos- 

 terior terior terior terior terior terior terior terior 

 Segments: 9 12 14 19 21 21 19 20 

 9 13 17 19 22 22 23 23 



This species has been examined recently by Batham and Tomlinson 

 (1965), to which the reader is referred for details. 



Australophialus utinomii, new species 



Figure 32 



Diagnosis: Australophialus with operculum with margin entire 

 and in the shape of a little shield, with no prominent hooks, or spines, 

 but fringed with numerous small, bifid teeth. Pointed lateral bars 

 associated with numerous very small, simple teeth along its length. 



Etymology: Named for the eminent cirripedologist. Professor 

 Huzio Utinomi, of the Seto Marine Biological Laboratories, Japan. 



Distribution: Five complete specimens and two fragments from 

 Dinoplax gigas, from Qolora, Cape Province, South Africa, from the 

 collection of the University of Cape Town QQ.I.J. 20.5.39. 



Type-material: Holotype: UCT, 1.15 X 0.95 mm with aper- 

 ture of 0.35 mm long. Paratypes: Brit, SFSC, USNM. Average 

 size of four measurable specimens 1.29 X 0.85 mm with aperture of 

 0.41 mm. 



The mantle is in the shape of a small bag, equipped with circular 

 and longitudinal muscle bands, and studded with numerous fine 

 teeth with one to four points. A well-developed adhesive attachment 

 disk is present, but no orificial knob is present. 



A pair of lateral bars reinforce the sides of the mantle, and are 

 associated with three of four loose rows of very small spines pro- 

 jecting posteriorly on the ventral side and immediately external to 

 the lateral bars. An internal reinforcing bar is found in the dorsal, 

 apertural region. 



The characteristic opercular plates fit close together and resemble 

 a little shield. The margins are equipped with over a dozen bifid 

 (rarely trifid) teeth each, plus numerous hairs, but are otherwise 

 smooth and not notched or otherwise armed. The typical comb coUar 

 infolds from the ventral margin of the aperture. 



The head is distinct from a separate crested fold immediately 

 behind it. It is not markedly hairy or otherwise ornamented. 



