128 



UNITED STATES NATIONAL MUSEUM BULLETIN 296 



I would like to acknowledge the receipt of many specimens from 

 Dr. H. G. Vevers, Marine Biological Laboratory, Plymouth, England, 

 and one specimen from Dr. Ovar Nybelin, Goteborg Museum, 

 Sweden. 



Material : Specimens from Lunatia heros occupied by a hermit crab 

 from Falmouth, Massachusetts, (courtesy of Victor Zullo), were sent 

 to the following: Aust, BPB, Brit, Belg, BA, Dublin, Mex, Paris, 

 Seto, SFSC, UCT, USNM, Vict. 



HK 



HD 



Figure 34. — Trypetesa lampas (Hancock, 1849), from Lunatia heros from Falmouth, Mas- 

 sachusetts: a, female viewed perpendicular to shell surface; b, viewed parallel to shell 

 surface; f, female in burrow, surface view. 



This species is oriented with the body at right angles to the surface 

 of the shell in which it has burrowed. The horny disk underlies that 

 portion of the shell directly opposed and in a straight line with the 

 apertural slit in the shell. The animals are found in a variety of mollusk 

 and barnacle shells, the original specimens being from Fusus antiquus 

 and Buccinum undatum. They attain a size of about 11 mm in greatest 

 diameter. Berndt (1907a) claims a subspecies which grows to be 

 two and a half times as large, but the description is incomplete. 

 T. lampas has pelagic nauplius, metanauplius, and cyprid stages, which 

 have been studied by Kiihnert (1934) and Genthe (1905). 



