88 UNITED STATES NATIONAL MUSEUM BULLETIN 29 6 



Cryptophialus minutus Darwin, 1854, page 563 



Figure 21 



[ = C. striatus Berndt, 1903b, page 436, =C. minutus striatus Berndt, 1907a, 

 page 167; 1907b, page 289]. 



Diagnosis: Cryptophialus with three pairs of terminal cirri; two 

 dorsal body appendages; mandible with three teeth; lateral bar 

 termination strongly swollen; one to seven males found on female; 

 free cyprid stage only; to 2.5 mm. 



This is the second described species in the order acrothoracica. 

 Darwin did a thorough job on it, his first barnacle, and got his start 

 on cirripeds and an effective impetus toward the foundation of his 

 principles of evolution with this species. He placed it in the order 

 Abdominalia, leaving the earlier Trypetesa {=Alcippe) lampas in the 

 Lepadidae. Both are now in the order Acrothoracica. 



Distribution: The species was described horR Concholepas peru- 

 viana from the Chonos Archipelago, southfern Chile. Berndt (1903b) 

 extended the host list to Chiton magnijlcus, also from Chile. I can now 

 extend the host and distribution list as follows: 



Concholepas concholepas Brugiuere, 1789; purchased in Santiago, 

 Chile, from local market as "crazy shell" food, by Blanca Nebenschoss 

 de Kurlat of Buenos Aires, Argentina, who kindly gave it to me. Nine 

 dried specimens were removed in good condition. The figures are 

 from these specimens. The average size of three whole specimens is 

 2.15 X 1.11 mm. 



Concholepas concholepas, Ushuaia, Tierra del Fuego, Argentina, 

 loaned by the Museo Argentine de Ciencias Naturales, Buenos 

 Aires, through the courtesy of Professora Martinez Fonte (their 

 number 19832). Six dried specimens removed in good condition. 



Empty slits without recognizable specimens also were found in: 

 Acanthina {Chorus) gigantea Lesson. Talcahuano, Chile, 13829; 

 C. concholepas. Pucusana, Peru (60 km. south of Lima) ; 

 C. concholepas. Puerto San Antonia, Santiago, Chile, 12865; 

 Fissurella maxima Sow. Valparaiso, Chile, 9027. 



Material: The nine specimens are deposited as follows: Aust, 

 BPB, Brit, BA, Mex, Seto, SFSC, USNM, Vict. 



When describing his new species of Cryptophialus striatus in 1903, 

 Berndt clearly pointed out that he based his new designation solely 

 on a comparison with Darwin's descriptions and dramngs. He stated 

 that the main differences were the regular chitinous striations on the 

 dorsal body surface, and the somewhat heavier thoracic portion of 

 his new species, together with the occurrence of the animal in a 

 chiton, instead of a gastropod. He gave a good description of the 



