THE BURROWING BARNACLES (CIRRIPEDIA: ACROTHORACICA) 67 



Kochlorine was originally described as lacking an adhesive disk, 

 lying free in the cavity, and anchored by the various hooks and spines 

 along the operculum. This is erroneous, although the first discovery 

 of such relatively large hooks could easily lead to such a view. The 

 material I have examined was cemented in the usual acrothoracican 

 manner. 



The mantle of the female is typical. The original description stated 

 their size as "3 mm." My illustrated specimen (fig. 13a) from Port 

 Moresby, Papua, is 2.9 X 1.75 mm. Three specimens from Thais 

 haemastoma L. from Cadiz, Spain (type-locaUty), from the shell col- 

 lection of the Institute Royal de Belgique average 2.35 X 0.925 mm, 

 while specimens from the eastern Pacific (Panama) averaged 0.975 X 

 0.570 nam (of 16 specimens), the largest being 1.20 X 0.83 mm, while 

 three specimens from the eastern Pacific (Acapulco) were much 

 smaller (average 0.733 X 0.442 mm). Three specimens from Ghana 

 average 0.627 X 0.340 mm, with a cyprid carapace of 0.775 X 0.036 

 mm, but these were in a shell less than 2.1 mm thick! 



The mantle has the usual sprinkling of teeth, most of which are 

 bifid. A pronounced horny adhesive disk and horny knob are present, 

 but there is no separate orificial knob in the attachment area. 



The mantle aperture has a well-armed operculum, bearing a pair 

 of toothed cones anteriorly and a single strong hook dorsoposteriorly. 

 The hook has a double termination of sharp, hyahne, dorsally curved 

 points. Scattered bifid teeth and a few relatively short hairs are 

 present on the operculum. 



The hook may be on the animal's right or left side, but never on 

 both. Many specimens were carefully examined for this, and the in- 

 cidence on the right and left sides are approximately equal. A differ- 

 ential count in the various localities may prove interesting with more 

 material, however. 



A pair of strong granulated lateral bars is present, plus a single, 

 strong, internal, reinforcing rod extending posteriorly from the dorsal 

 end of the operculum. The retractor pallii rostralis is well developed, 

 as is to a lesser extent the retractor orificii. The retractor corporis is 

 probably present in the form of several rather small strands. 



Inside the anteroventral angle of the mantle is the usual comb 

 collar. 



The female body is composed of a head region bearing scattered 

 hairs anteriorly, an unpaired labrum, and pairs each of mandibles 

 with palps, first and second maxillae, mouth cirri, three pairs of bi- 

 ramous terminal cirri, and a pair of uniramous caudal appendages. 



The mouthparts are typical of the order. The mandible possesses 

 three strong teeth and a haired, fine-toothed, inner cutting angle. The 

 first maxillae bear two major spines with minor spines, teeth, and 



