the Cirripe^e Genus Stramcntiim. 



81 



from otlier cirripedcs in wliicli tlie capitulum and pcdnnclc 

 were not well defined. Tliis is borne out not only by the 

 postlarval development of certain reeeut pedunculate (nrri- 

 pedes, but by the forms o^ Archmolepas. Sucli a modification 

 was no doubt independently developed in other lines of 



m 



C.L. 



■m 



Fig. 1, — Tiarilepaa rcriyhtiamis, H. Woodward, a, shell viewed from 

 back and left side, a , transverse section of shell : vi, median 

 plates ; /, lateral plates, b, portion cf shell enlarged. (I'igs. «, 

 o, after Gruvel ; a', after Withers.) 



Fig. 2. — Strumentiiut pulc/iellmn, G. B. Sovverhy, Jun., sp., showing mode 

 of imbrication of peduncular scales. (After Gruvel.) C.,carinal 

 scales ; C.L., carino-lateral scales ; L., lateral scales ; 11. L., 

 rostro-lateral scales ; 11., rostral scales. 



descent. Having arrived at tlie pedunculated stage, several 

 forms have independently reduced the peduncle and even- 

 tually assumed the sessile condition. This has been shown 

 in the case of the Verrueidic, and there can be no doubt that 

 Ann, cL- Mag. iV. IJist. Ser. \). Vol. v. 6 



