THE BURROWING BARNACLES (CIRRIPEDIA: ACROTHORACICA) 97 



Cryptophialus wainwrighti, new species 



Figure 25 



Diagnosis: Cryptophialus with mouth cirrus, three pairs of terminal 

 cirri, and two dorsal filamentary body processes. With three com- 

 pound spines and about four large bifid teeth along each mantle 

 aperture, none of which is finely serrated. Lateral bar terminates in 

 an array of single spines pointing ventrally. Mandible with three 

 teeth, with prominent notch between outer and middle tooth. 



Etymology: Named in honor of Stephen A. Wainwright, of Duke 

 University, colleague and friend, who has given me material including 

 several new species of acrothoracican cirripeds. 



Distribution: Found in Thais triseriallis Blain. from Soldado 

 Bay, near Guaymas, Mexico, and T. haemostoma Lomans, Mazatlan, 

 Mexico, both from the California Academy of Sciences. Found in 

 association with Kochlorine hamata Noll. Two specimens in Tridacna 

 maxima from Heron Island. 



Type-material: Holotype: CA. Paratypes: Aust, BA, Mex, 

 USNM. Additional material: BPB, Brit, Paris, SFSC, UCT, Vict. 



This species is very near to C. minutus Darwin, and differs pri- 

 marily according to the following description. 



The size of the female, determined from an average of ten specimens 

 randomly pipetted out of the several hundred alcoholic specimens 

 occupying a single shell, is 1.43 X 0.84 mm, with an aperture length 

 of 0.26 mm. One burrow aperture was approximately 0.25 X 0.1 mm. 



The operculum has a distinctive armature of two large spines with 

 smaller teeth on the sides, plus a large, toothed spine at the attach- 

 ment end variously developed on each operculum. In addition, large, 

 blunted, bifid teeth, usually numbering four, are arrayed along the 

 ventral side of each operculum. 



The mantle just under the aperture is a brownish purple in alcoholic 

 specimens. This area bears a row of small bifid teeth pointing an- 

 teriorly along the side of the mantle, averaging 8.3 in number on 

 each side, with a range of five to twelve. They are arrayed on either 

 side of the anterior end of the lateral bar, averaging 6.1 in number 

 on the ventral side and 2.25 on the dorsal side. This is a low number 

 for the genus. 



The lateral bars are simple, pointed, and extend posteriorly along 

 each side of the mantle. They end in an array of single spines, point 

 ventrally, and are often arranged in crude circles. Along the sides of 

 the lateral bars, but especially the ventral side, are characteristic 

 bifid or trifid teeth which project poster© ventrally, and are set on 

 bases which taper into thin points anterodorsally. Another single 

 reinforcing bar is seen in the dorsal apertural area, and a row of 



